With the recent issues with the roller door controller, perhaps it's time to look at purchasing a proper solution for it instead of constantly macgyvering one?
The ones I have been looking at for the robot wars robot should be fairly capable of driving the door up and down, and can be re-purposed for something else later if/when we move out.
Should be able to handle the high current spikes that thing likes, and also gives us current metering which means we can shut it off it is approaching failure point.
> With the recent issues with the roller door controller, perhaps it's time to > look at purchasing a proper solution for it instead of constantly > macgyvering one? > The ones I have been looking at for the robot wars robot should be fairly > capable of driving the door up and down, and can be re-purposed for > something else later if/when we move out. > http://www.pololu.com/catalog/product/1457 <--- these ones. > Should be able to handle the high current spikes that thing likes, and also > gives us current metering which means we can shut it off it is approaching > failure point. > Anyone got any better ideas? > Lemming.
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James honey, trivial or not, the door failed yet again... It's not
against what you do for us in fixing the door, it's that the door
seems to be constantly failing... This is why Lemming is bringing this
up, it's about the door's reliability... Ok hon?
If a new controller will stop the door failing, than it's worth its
money, and you won't have to be called in so many times...
- Rachael.
On Aug 26, 1:01 am, James Churchill <pel...@gmail.com> wrote:
> The door's working fine. Tonight's issue was trivial.
> - James
> On 26 August 2011 00:46, Lemming . <inert...@gmail.com> wrote:
> > Hi all,
> > With the recent issues with the roller door controller, perhaps it's time to
> > look at purchasing a proper solution for it instead of constantly
> > macgyvering one?
> > The ones I have been looking at for the robot wars robot should be fairly
> > capable of driving the door up and down, and can be re-purposed for
> > something else later if/when we move out.
> >http://www.pololu.com/catalog/product/1457<--- these ones.
> > Should be able to handle the high current spikes that thing likes, and also
> > gives us current metering which means we can shut it off it is approaching
> > failure point.
> > Anyone got any better ideas?
> > Lemming.
> > --
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> > "hackerspace_brisbane" group.
> > To post to this group, send email to hackerspace_brisbane@googlegroups.com.
> > To unsubscribe from this group, send email to
> > hackerspace_brisbane+unsubscribe@googlegroups.com.
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> >http://groups.google.com/group/hackerspace_brisbane?hl=en.
1) From where you are, all the failures look identical to you, but when some are a real problem (like a critical component dying) and some are trivial (like the power cable getting unplugged.) Throwing out a working system that someone has spent significant time on *because it was unplugged* is nuts. 2) Regardless of what we buy to replace it with, there's still going to be a period where failures happen, until we get it fully sorted out. It's pretty much fully sorted out with the current system, so going back to the start is nuts. 3) There have been TWO COMPLETE REDESIGNS since Buzz's original controller died. The first was bad and is where most of the problems occurred. The second has been in place for LESS THAN TWO WEEKS. And it's only had a couple of minor problems that are now resolved. Don't throw out the current good system because the old system was bad.
- James
On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> wrote:
> James honey, trivial or not, the door failed yet again... It's not > against what you do for us in fixing the door, it's that the door > seems to be constantly failing... This is why Lemming is bringing this > up, it's about the door's reliability... Ok hon? > If a new controller will stop the door failing, than it's worth its > money, and you won't have to be called in so many times...
> - Rachael.
> On Aug 26, 1:01 am, James Churchill <pel...@gmail.com> wrote: >> The door's working fine. Tonight's issue was trivial.
>> - James
>> On 26 August 2011 00:46, Lemming . <inert...@gmail.com> wrote:
>> > Hi all,
>> > With the recent issues with the roller door controller, perhaps it's time to >> > look at purchasing a proper solution for it instead of constantly >> > macgyvering one? >> > The ones I have been looking at for the robot wars robot should be fairly >> > capable of driving the door up and down, and can be re-purposed for >> > something else later if/when we move out. >> >http://www.pololu.com/catalog/product/1457<--- these ones. >> > Should be able to handle the high current spikes that thing likes, and also >> > gives us current metering which means we can shut it off it is approaching >> > failure point. >> > Anyone got any better ideas? >> > Lemming.
>> > -- >> > You received this message because you are subscribed to the Google Groups >> > "hackerspace_brisbane" group. >> > To post to this group, send email to hackerspace_brisbane@googlegroups.com. >> > To unsubscribe from this group, send email to >> > hackerspace_brisbane+unsubscribe@googlegroups.com. >> > For more options, visit this group at >> >http://groups.google.com/group/hackerspace_brisbane?hl=en.
> -- > You received this message because you are subscribed to the Google Groups "hackerspace_brisbane" group. > To post to this group, send email to hackerspace_brisbane@googlegroups.com. > To unsubscribe from this group, send email to hackerspace_brisbane+unsubscribe@googlegroups.com. > For more options, visit this group at http://groups.google.com/group/hackerspace_brisbane?hl=en.
On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> wrote:
> it's that the door > seems to be constantly failing...
And my point is that perception is incorrect.
Again, *only* look at the problems that have occurred since tuesday last week; anything before that date was on the old setup which has been completely thrown out.
The current solution is good. I don't see any reason to change. We've invested the time getting it working, I don't see any benefit in investing more money in a replacement system which would have its own drawbacks and settling in period.
On 26 August 2011 01:21, James Churchill <pel...@gmail.com> wrote:
> On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> wrote: > > it's that the door > > seems to be constantly failing...
> And my point is that perception is incorrect.
> Again, *only* look at the problems that have occurred since tuesday > last week; anything before that date was on the old setup which has > been completely thrown out.
> - James
> -- > You received this message because you are subscribed to the Google Groups > "hackerspace_brisbane" group. > To post to this group, send email to hackerspace_brisbane@googlegroups.com > . > To unsubscribe from this group, send email to > hackerspace_brisbane+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/hackerspace_brisbane?hl=en.
Hey guys, was leaving work to head here and Rachael rang me to say the door was not working again.
Headed over here and it appears the switch is not making proper contact (pushed it to the open position and nada, wiggled it a bit and it worked) and also the servo doesn't seem to be moving quite far enough to positively engage the switch every time.
Personally I think either the current solution needs to be improved to make it more reliable (2 failures in a week that I know of) or we try a different solution
On 26 August 2011 11:03, tjhowse <tjho...@gmail.com> wrote:
> The current solution is good. I don't see any reason to change. We've > invested the time getting it working, I don't see any benefit in investing > more money in a replacement system which would have its own drawbacks and > settling in period.
> On 26 August 2011 01:21, James Churchill <pel...@gmail.com> wrote:
>> On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> wrote: >> > it's that the door >> > seems to be constantly failing...
>> And my point is that perception is incorrect.
>> Again, *only* look at the problems that have occurred since tuesday >> last week; anything before that date was on the old setup which has >> been completely thrown out.
>> - James
>> -- >> You received this message because you are subscribed to the Google Groups >> "hackerspace_brisbane" group. >> To post to this group, send email to >> hackerspace_brisbane@googlegroups.com. >> To unsubscribe from this group, send email to >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> -- > You received this message because you are subscribed to the Google Groups > "hackerspace_brisbane" group. > To post to this group, send email to hackerspace_brisbane@googlegroups.com > . > To unsubscribe from this group, send email to > hackerspace_brisbane+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/hackerspace_brisbane?hl=en.
At the space again, and again the door isn't working. Don't have my keys with me. We need to fix this ASAP so that the door is reliable, because atm it isn't.
From: Daniel Harmsworth <danielharmswo...@gmail.com> Sent: Sunday, 4 September 2011 15:58 To: Lemming . <inert...@gmail.com> Subject: Re: Recent issues with the door controller. Controllers we're building should cope with 150+ Amps, if thats any help
On 4 September 2011 13:56, Lemming . <inert...@gmail.com> wrote:
> we already tried that, it's 24v at quite a lot of amps, the shoot through is > impressive...
> On 4 September 2011 15:55, Daniel Harmsworth <danielharmswo...@gmail.com> > wrote:
>> Bog standard double H bridge would do it very cleanly. I am likely >> getting a bunch of PCB's for these fabricated for work in the next >> month or so, I can send a couple over if you like.
>> On 4 September 2011 13:50, Lemming . <inert...@gmail.com> wrote: >> > It needs to drive the door both up and down, so we'd need a couple of >> > them.
>> > I was just looking at using one of those pololu controllers because they >> > are >> > designed to do that already, and they are pretty beefy. >> > On 2 September 2011 19:27, Daniel Harmsworth >> > <danielharmswo...@gmail.com> >> > wrote:
>> >> Not replying on list as it seems a bit of a sensitive subject and I >> >> didnt want to tread on anybody's toes, but is there a reason you guys >> >> need to use a mechanical switch? A solid-state relay that can handle >> >> upwards of 40A only costs on the order of $30, we've used them for a >> >> bunch of projects dealing with high current devices and had excellent >> >> results. To run it off of an arduino you just need a bog standard >> >> signal transistor off of a 5v rail into the SSR input.
>> >> Just a thought.
>> >> Happy Hacking!
>> >> On 2 September 2011 14:28, Lemming . <inert...@gmail.com> wrote: >> >> > Hey guys, was leaving work to head here and Rachael rang me to say >> >> > the >> >> > door >> >> > was not working again. >> >> > Headed over here and it appears the switch is not making proper >> >> > contact >> >> > (pushed it to the open position and nada, wiggled it a bit and it >> >> > worked) >> >> > and also the servo doesn't seem to be moving quite far enough to >> >> > positively >> >> > engage the switch every time. >> >> > Personally I think either the current solution needs to be improved >> >> > to >> >> > make >> >> > it more reliable (2 failures in a week that I know of) or we try a >> >> > different >> >> > solution >> >> > On 26 August 2011 11:03, tjhowse <tjho...@gmail.com> wrote:
>> >> >> The current solution is good. I don't see any reason to change. >> >> >> We've >> >> >> invested the time getting it working, I don't see any benefit in >> >> >> investing >> >> >> more money in a replacement system which would have its own >> >> >> drawbacks >> >> >> and >> >> >> settling in period.
>> >> >> On 26 August 2011 01:21, James Churchill <pel...@gmail.com> wrote:
>> >> >>> On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> >> >> >>> wrote: >> >> >>> > it's that the door >> >> >>> > seems to be constantly failing...
>> >> >>> And my point is that perception is incorrect.
>> >> >>> Again, *only* look at the problems that have occurred since tuesday >> >> >>> last week; anything before that date was on the old setup which has >> >> >>> been completely thrown out.
>> >> >>> - James
>> >> >>> -- >> >> >>> You received this message because you are subscribed to the Google >> >> >>> Groups >> >> >>> "hackerspace_brisbane" group. >> >> >>> To post to this group, send email to >> >> >>> hackerspace_brisbane@googlegroups.com. >> >> >>> To unsubscribe from this group, send email to >> >> >>> hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >>> For more options, visit this group at >> >> >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> >> -- >> >> >> You received this message because you are subscribed to the Google >> >> >> Groups >> >> >> "hackerspace_brisbane" group. >> >> >> To post to this group, send email to >> >> >> hackerspace_brisbane@googlegroups.com. >> >> >> To unsubscribe from this group, send email to >> >> >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >> For more options, visit this group at >> >> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> > -- >> >> > You received this message because you are subscribed to the Google >> >> > Groups >> >> > "hackerspace_brisbane" group. >> >> > To post to this group, send email to >> >> > hackerspace_brisbane@googlegroups.com. >> >> > To unsubscribe from this group, send email to >> >> > hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> > For more options, visit this group at >> >> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote: > At the space again, and again the door isn't working. Don't have my > keys with me. We need to fix this ASAP so that the door is reliable, > because atm it isn't.
> From: Daniel Harmsworth <danielharmswo...@gmail.com> > Sent: Sunday, 4 September 2011 15:58 > To: Lemming . <inert...@gmail.com> > Subject: Re: Recent issues with the door controller. > Controllers we're building should cope with 150+ Amps, if thats any help
> On 4 September 2011 13:56, Lemming . <inert...@gmail.com> wrote: > > we already tried that, it's 24v at quite a lot of amps, the shoot through > is > > impressive...
> > On 4 September 2011 15:55, Daniel Harmsworth <danielharmswo...@gmail.com
> > wrote:
> >> Bog standard double H bridge would do it very cleanly. I am likely > >> getting a bunch of PCB's for these fabricated for work in the next > >> month or so, I can send a couple over if you like.
> >> On 4 September 2011 13:50, Lemming . <inert...@gmail.com> wrote: > >> > It needs to drive the door both up and down, so we'd need a couple of > >> > them.
> >> > I was just looking at using one of those pololu controllers because > they > >> > are > >> > designed to do that already, and they are pretty beefy. > >> > On 2 September 2011 19:27, Daniel Harmsworth > >> > <danielharmswo...@gmail.com> > >> > wrote:
> >> >> Not replying on list as it seems a bit of a sensitive subject and I > >> >> didnt want to tread on anybody's toes, but is there a reason you guys > >> >> need to use a mechanical switch? A solid-state relay that can handle > >> >> upwards of 40A only costs on the order of $30, we've used them for a > >> >> bunch of projects dealing with high current devices and had excellent > >> >> results. To run it off of an arduino you just need a bog standard > >> >> signal transistor off of a 5v rail into the SSR input.
> >> >> Just a thought.
> >> >> Happy Hacking!
> >> >> On 2 September 2011 14:28, Lemming . <inert...@gmail.com> wrote: > >> >> > Hey guys, was leaving work to head here and Rachael rang me to say > >> >> > the > >> >> > door > >> >> > was not working again. > >> >> > Headed over here and it appears the switch is not making proper > >> >> > contact > >> >> > (pushed it to the open position and nada, wiggled it a bit and it > >> >> > worked) > >> >> > and also the servo doesn't seem to be moving quite far enough to > >> >> > positively > >> >> > engage the switch every time. > >> >> > Personally I think either the current solution needs to be improved > >> >> > to > >> >> > make > >> >> > it more reliable (2 failures in a week that I know of) or we try a > >> >> > different > >> >> > solution > >> >> > On 26 August 2011 11:03, tjhowse <tjho...@gmail.com> wrote:
> >> >> >> The current solution is good. I don't see any reason to change. > >> >> >> We've > >> >> >> invested the time getting it working, I don't see any benefit in > >> >> >> investing > >> >> >> more money in a replacement system which would have its own > >> >> >> drawbacks > >> >> >> and > >> >> >> settling in period.
> >> >> >> On 26 August 2011 01:21, James Churchill <pel...@gmail.com> > wrote:
> >> >> >>> On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> > >> >> >>> wrote: > >> >> >>> > it's that the door > >> >> >>> > seems to be constantly failing...
> >> >> >>> And my point is that perception is incorrect.
> >> >> >>> Again, *only* look at the problems that have occurred since > tuesday > >> >> >>> last week; anything before that date was on the old setup which > has > >> >> >>> been completely thrown out.
> >> >> >>> - James
> >> >> >>> -- > >> >> >>> You received this message because you are subscribed to the > Google > >> >> >>> Groups > >> >> >>> "hackerspace_brisbane" group. > >> >> >>> To post to this group, send email to > >> >> >>> hackerspace_brisbane@googlegroups.com. > >> >> >>> To unsubscribe from this group, send email to > >> >> >>> hackerspace_brisbane+unsubscribe@googlegroups.com. > >> >> >>> For more options, visit this group at > >> >> >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >> >> >> -- > >> >> >> You received this message because you are subscribed to the Google > >> >> >> Groups > >> >> >> "hackerspace_brisbane" group. > >> >> >> To post to this group, send email to > >> >> >> hackerspace_brisbane@googlegroups.com. > >> >> >> To unsubscribe from this group, send email to > >> >> >> hackerspace_brisbane+unsubscribe@googlegroups.com. > >> >> >> For more options, visit this group at > >> >> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >> >> > -- > >> >> > You received this message because you are subscribed to the Google > >> >> > Groups > >> >> > "hackerspace_brisbane" group. > >> >> > To post to this group, send email to > >> >> > hackerspace_brisbane@googlegroups.com. > >> >> > To unsubscribe from this group, send email to > >> >> > hackerspace_brisbane+unsubscribe@googlegroups.com. > >> >> > For more options, visit this group at > >> >> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >> >> -- > >> >> Daniel Harmsworth > >> >> Chairman, The Perth Artifactory Inc. > >> >> http://www.artifactory.org.au
> -- > You received this message because you are subscribed to the Google Groups > "hackerspace_brisbane" group. > To post to this group, send email to hackerspace_brisbane@googlegroups.com > . > To unsubscribe from this group, send email to > hackerspace_brisbane+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/hackerspace_brisbane?hl=en.
On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote: > At the space again, and again the door isn't working. Don't have my > keys with me. We need to fix this ASAP so that the door is reliable, > because atm it isn't.
<trent.wadding...@gmail.com> wrote: > On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote: >> At the space again, and again the door isn't working. Don't have my >> keys with me. We need to fix this ASAP so that the door is reliable, >> because atm it isn't.
> James, ya fix the door yet? ;)
> Trent
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Kinda hard to tell what is not working considering I can't get into the building... I swiped my card a couple of times on the external reader and nothing happens.
From: Joel Byrnes <fatal.exception.occur...@gmail.com> Sent: Sunday, 4 September 2011 19:16 To: hackerspace_brisbane@googlegroups.com <hackerspace_brisbane@googlegroups.com> Subject: Re: Recent issues with the door controller. Can we get any more detailed description of "it's not working"? is it a case for the time being of plug it back in again, or turn it off and on again?
<trent.wadding...@gmail.com> wrote: > On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote: >> At the space again, and again the door isn't working. Don't have my >> keys with me. We need to fix this ASAP so that the door is reliable, >> because atm it isn't.
> James, ya fix the door yet? ;)
> Trent
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On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote: > At the space again, and again the door isn't working. Don't have my > keys with me. We need to fix this ASAP so that the door is reliable, > because atm it isn't.
> From: Daniel Harmsworth <danielharmswo...@gmail.com> > Sent: Sunday, 4 September 2011 15:58 > To: Lemming . <inert...@gmail.com> > Subject: Re: Recent issues with the door controller. > Controllers we're building should cope with 150+ Amps, if thats any help
> On 4 September 2011 13:56, Lemming . <inert...@gmail.com> wrote: > > we already tried that, it's 24v at quite a lot of amps, the shoot through > is > > impressive...
> > On 4 September 2011 15:55, Daniel Harmsworth <danielharmswo...@gmail.com
> > wrote:
> >> Bog standard double H bridge would do it very cleanly. I am likely > >> getting a bunch of PCB's for these fabricated for work in the next > >> month or so, I can send a couple over if you like.
> >> On 4 September 2011 13:50, Lemming . <inert...@gmail.com> wrote: > >> > It needs to drive the door both up and down, so we'd need a couple of > >> > them.
> >> > I was just looking at using one of those pololu controllers because > they > >> > are > >> > designed to do that already, and they are pretty beefy. > >> > On 2 September 2011 19:27, Daniel Harmsworth > >> > <danielharmswo...@gmail.com> > >> > wrote:
> >> >> Not replying on list as it seems a bit of a sensitive subject and I > >> >> didnt want to tread on anybody's toes, but is there a reason you guys > >> >> need to use a mechanical switch? A solid-state relay that can handle > >> >> upwards of 40A only costs on the order of $30, we've used them for a > >> >> bunch of projects dealing with high current devices and had excellent > >> >> results. To run it off of an arduino you just need a bog standard > >> >> signal transistor off of a 5v rail into the SSR input.
> >> >> Just a thought.
> >> >> Happy Hacking!
> >> >> On 2 September 2011 14:28, Lemming . <inert...@gmail.com> wrote: > >> >> > Hey guys, was leaving work to head here and Rachael rang me to say > >> >> > the > >> >> > door > >> >> > was not working again. > >> >> > Headed over here and it appears the switch is not making proper > >> >> > contact > >> >> > (pushed it to the open position and nada, wiggled it a bit and it > >> >> > worked) > >> >> > and also the servo doesn't seem to be moving quite far enough to > >> >> > positively > >> >> > engage the switch every time. > >> >> > Personally I think either the current solution needs to be improved > >> >> > to > >> >> > make > >> >> > it more reliable (2 failures in a week that I know of) or we try a > >> >> > different > >> >> > solution > >> >> > On 26 August 2011 11:03, tjhowse <tjho...@gmail.com> wrote:
> >> >> >> The current solution is good. I don't see any reason to change. > >> >> >> We've > >> >> >> invested the time getting it working, I don't see any benefit in > >> >> >> investing > >> >> >> more money in a replacement system which would have its own > >> >> >> drawbacks > >> >> >> and > >> >> >> settling in period.
> >> >> >> On 26 August 2011 01:21, James Churchill <pel...@gmail.com> > wrote:
> >> >> >>> On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> > >> >> >>> wrote: > >> >> >>> > it's that the door > >> >> >>> > seems to be constantly failing...
> >> >> >>> And my point is that perception is incorrect.
> >> >> >>> Again, *only* look at the problems that have occurred since > tuesday > >> >> >>> last week; anything before that date was on the old setup which > has > >> >> >>> been completely thrown out.
> >> >> >>> - James
> >> >> >>> -- > >> >> >>> You received this message because you are subscribed to the > Google > >> >> >>> Groups > >> >> >>> "hackerspace_brisbane" group. > >> >> >>> To post to this group, send email to > >> >> >>> hackerspace_brisbane@googlegroups.com. > >> >> >>> To unsubscribe from this group, send email to > >> >> >>> hackerspace_brisbane+unsubscribe@googlegroups.com. > >> >> >>> For more options, visit this group at > >> >> >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >> >> >> -- > >> >> >> You received this message because you are subscribed to the Google > >> >> >> Groups > >> >> >> "hackerspace_brisbane" group. > >> >> >> To post to this group, send email to > >> >> >> hackerspace_brisbane@googlegroups.com. > >> >> >> To unsubscribe from this group, send email to > >> >> >> hackerspace_brisbane+unsubscribe@googlegroups.com. > >> >> >> For more options, visit this group at > >> >> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >> >> > -- > >> >> > You received this message because you are subscribed to the Google > >> >> > Groups > >> >> > "hackerspace_brisbane" group. > >> >> > To post to this group, send email to > >> >> > hackerspace_brisbane@googlegroups.com. > >> >> > To unsubscribe from this group, send email to > >> >> > hackerspace_brisbane+unsubscribe@googlegroups.com. > >> >> > For more options, visit this group at > >> >> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >> >> -- > >> >> Daniel Harmsworth > >> >> Chairman, The Perth Artifactory Inc. > >> >> http://www.artifactory.org.au
> -- > You received this message because you are subscribed to the Google Groups > "hackerspace_brisbane" group. > To post to this group, send email to hackerspace_brisbane@googlegroups.com > . > To unsubscribe from this group, send email to > hackerspace_brisbane+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/hackerspace_brisbane?hl=en.
I swapped the switch out last night; the old one died in a fashion that probably is going to happen again. So yeah, now it's time to buy something off the shelf.
- James
On 4 September 2011 19:57, buzz <davidb...@gmail.com> wrote:
> I've tried to fix it, James has tried to fix it, maybe it's your turn?
> On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote:
>> At the space again, and again the door isn't working. Don't have my >> keys with me. We need to fix this ASAP so that the door is reliable, >> because atm it isn't.
>> From: Daniel Harmsworth <danielharmswo...@gmail.com> >> Sent: Sunday, 4 September 2011 15:58 >> To: Lemming . <inert...@gmail.com> >> Subject: Re: Recent issues with the door controller. >> Controllers we're building should cope with 150+ Amps, if thats any help
>> On 4 September 2011 13:56, Lemming . <inert...@gmail.com> wrote: >> > we already tried that, it's 24v at quite a lot of amps, the shoot >> > through is >> > impressive...
>> > On 4 September 2011 15:55, Daniel Harmsworth >> > <danielharmswo...@gmail.com> >> > wrote:
>> >> Bog standard double H bridge would do it very cleanly. I am likely >> >> getting a bunch of PCB's for these fabricated for work in the next >> >> month or so, I can send a couple over if you like.
>> >> On 4 September 2011 13:50, Lemming . <inert...@gmail.com> wrote: >> >> > It needs to drive the door both up and down, so we'd need a couple of >> >> > them.
>> >> > I was just looking at using one of those pololu controllers because >> >> > they >> >> > are >> >> > designed to do that already, and they are pretty beefy. >> >> > On 2 September 2011 19:27, Daniel Harmsworth >> >> > <danielharmswo...@gmail.com> >> >> > wrote:
>> >> >> Not replying on list as it seems a bit of a sensitive subject and I >> >> >> didnt want to tread on anybody's toes, but is there a reason you >> >> >> guys >> >> >> need to use a mechanical switch? A solid-state relay that can handle >> >> >> upwards of 40A only costs on the order of $30, we've used them for a >> >> >> bunch of projects dealing with high current devices and had >> >> >> excellent >> >> >> results. To run it off of an arduino you just need a bog standard >> >> >> signal transistor off of a 5v rail into the SSR input.
>> >> >> Just a thought.
>> >> >> Happy Hacking!
>> >> >> On 2 September 2011 14:28, Lemming . <inert...@gmail.com> wrote: >> >> >> > Hey guys, was leaving work to head here and Rachael rang me to say >> >> >> > the >> >> >> > door >> >> >> > was not working again. >> >> >> > Headed over here and it appears the switch is not making proper >> >> >> > contact >> >> >> > (pushed it to the open position and nada, wiggled it a bit and it >> >> >> > worked) >> >> >> > and also the servo doesn't seem to be moving quite far enough to >> >> >> > positively >> >> >> > engage the switch every time. >> >> >> > Personally I think either the current solution needs to be >> >> >> > improved >> >> >> > to >> >> >> > make >> >> >> > it more reliable (2 failures in a week that I know of) or we try a >> >> >> > different >> >> >> > solution >> >> >> > On 26 August 2011 11:03, tjhowse <tjho...@gmail.com> wrote:
>> >> >> >> The current solution is good. I don't see any reason to change. >> >> >> >> We've >> >> >> >> invested the time getting it working, I don't see any benefit in >> >> >> >> investing >> >> >> >> more money in a replacement system which would have its own >> >> >> >> drawbacks >> >> >> >> and >> >> >> >> settling in period.
>> >> >> >> On 26 August 2011 01:21, James Churchill <pel...@gmail.com> >> >> >> >> wrote:
>> >> >> >>> On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> >> >> >> >>> wrote: >> >> >> >>> > it's that the door >> >> >> >>> > seems to be constantly failing...
>> >> >> >>> And my point is that perception is incorrect.
>> >> >> >>> Again, *only* look at the problems that have occurred since >> >> >> >>> tuesday >> >> >> >>> last week; anything before that date was on the old setup which >> >> >> >>> has >> >> >> >>> been completely thrown out.
>> >> >> >>> - James
>> >> >> >>> -- >> >> >> >>> You received this message because you are subscribed to the >> >> >> >>> Google >> >> >> >>> Groups >> >> >> >>> "hackerspace_brisbane" group. >> >> >> >>> To post to this group, send email to >> >> >> >>> hackerspace_brisbane@googlegroups.com. >> >> >> >>> To unsubscribe from this group, send email to >> >> >> >>> hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >> >>> For more options, visit this group at >> >> >> >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> >> >> -- >> >> >> >> You received this message because you are subscribed to the >> >> >> >> Google >> >> >> >> Groups >> >> >> >> "hackerspace_brisbane" group. >> >> >> >> To post to this group, send email to >> >> >> >> hackerspace_brisbane@googlegroups.com. >> >> >> >> To unsubscribe from this group, send email to >> >> >> >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >> >> For more options, visit this group at >> >> >> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> >> > -- >> >> >> > You received this message because you are subscribed to the Google >> >> >> > Groups >> >> >> > "hackerspace_brisbane" group. >> >> >> > To post to this group, send email to >> >> >> > hackerspace_brisbane@googlegroups.com. >> >> >> > To unsubscribe from this group, send email to >> >> >> > hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >> > For more options, visit this group at >> >> >> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> >> -- >> >> >> Daniel Harmsworth >> >> >> Chairman, The Perth Artifactory Inc. >> >> >> http://www.artifactory.org.au
>> -- >> You received this message because you are subscribed to the Google Groups >> "hackerspace_brisbane" group. >> To post to this group, send email to >> hackerspace_brisbane@googlegroups.com. >> To unsubscribe from this group, send email to >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> -- > You received this message because you are subscribed to the Google Groups > "hackerspace_brisbane" group. > To post to this group, send email to hackerspace_brisbane@googlegroups.com. > To unsubscribe from this group, send email to > hackerspace_brisbane+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/hackerspace_brisbane?hl=en.
Cool, I'm fine with that, so long as the group is fine with me buying parts to do so. We've tried kludging it a number of times now and it seems to just keep failing. I think it's time we admitted defeat and buy a working solution.
------------------------------ From: buzz <davidb...@gmail.com> Sent: Sunday, 4 September 2011 19:58 To: hackerspace_brisbane@googlegroups.com < hackerspace_brisbane@googlegroups.com> Subject: Re: Recent issues with the door controller.
I've tried to fix it, James has tried to fix it, maybe it's your turn?
On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote: > At the space again, and again the door isn't working. Don't have my > keys with me. We need to fix this ASAP so that the door is reliable, > because atm it isn't.
> From: Daniel Harmsworth <danielharmswo...@gmail.com> > Sent: Sunday, 4 September 2011 15:58 > To: Lemming . <inert...@gmail.com> > Subject: Re: Recent issues with the door controller. > Controllers we're building should cope with 150+ Amps, if thats any help
> On 4 September 2011 13:56, Lemming . <inert...@gmail.com> wrote: > > we already tried that, it's 24v at quite a lot of amps, the shoot through > is > > impressive...
> > On 4 September 2011 15:55, Daniel Harmsworth <danielharmswo...@gmail.com
> > wrote:
> >> Bog standard double H bridge would do it very cleanly. I am likely > >> getting a bunch of PCB's for these fabricated for work in the next > >> month or so, I can send a couple over if you like.
> >> On 4 September 2011 13:50, Lemming . <inert...@gmail.com> wrote: > >> > It needs to drive the door both up and down, so we'd need a couple of > >> > them.
> >> > I was just looking at using one of those pololu controllers because > they > >> > are > >> > designed to do that already, and they are pretty beefy. > >> > On 2 September 2011 19:27, Daniel Harmsworth > >> > <danielharmswo...@gmail.com> > >> > wrote:
> >> >> Not replying on list as it seems a bit of a sensitive subject and I > >> >> didnt want to tread on anybody's toes, but is there a reason you guys > >> >> need to use a mechanical switch? A solid-state relay that can handle > >> >> upwards of 40A only costs on the order of $30, we've used them for a > >> >> bunch of projects dealing with high current devices and had excellent > >> >> results. To run it off of an arduino you just need a bog standard > >> >> signal transistor off of a 5v rail into the SSR input.
> >> >> Just a thought.
> >> >> Happy Hacking!
> >> >> On 2 September 2011 14:28, Lemming . <inert...@gmail.com> wrote: > >> >> > Hey guys, was leaving work to head here and Rachael rang me to say > >> >> > the > >> >> > door > >> >> > was not working again. > >> >> > Headed over here and it appears the switch is not making proper > >> >> > contact > >> >> > (pushed it to the open position and nada, wiggled it a bit and it > >> >> > worked) > >> >> > and also the servo doesn't seem to be moving quite far enough to > >> >> > positively > >> >> > engage the switch every time. > >> >> > Personally I think either the current solution needs to be improved > >> >> > to > >> >> > make > >> >> > it more reliable (2 failures in a week that I know of) or we try a > >> >> > different > >> >> > solution > >> >> > On 26 August 2011 11:03, tjhowse <tjho...@gmail.com> wrote:
> >> >> >> The current solution is good. I don't see any reason to change. > >> >> >> We've > >> >> >> invested the time getting it working, I don't see any benefit in > >> >> >> investing > >> >> >> more money in a replacement system which would have its own > >> >> >> drawbacks > >> >> >> and > >> >> >> settling in period.
> >> >> >> On 26 August 2011 01:21, James Churchill <pel...@gmail.com> > wrote:
> >> >> >>> On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> > >> >> >>> wrote: > >> >> >>> > it's that the door > >> >> >>> > seems to be constantly failing...
> >> >> >>> And my point is that perception is incorrect.
> >> >> >>> Again, *only* look at the problems that have occurred since > tuesday > >> >> >>> last week; anything before that date was on the old setup which > has > >> >> >>> been completely thrown out.
> >> >> >>> - James
> >> >> >>> -- > >> >> >>> You received this message because you are subscribed to the > Google > >> >> >>> Groups > >> >> >>> "hackerspace_brisbane" group. > >> >> >>> To post to this group, send email to > >> >> >>> hackerspace_brisbane@googlegroups.com. > >> >> >>> To unsubscribe from this group, send email to > >> >> >>> hackerspace_brisbane+unsubscribe@googlegroups.com. > >> >> >>> For more options, visit this group at > >> >> >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >> >> >> -- > >> >> >> You received this message because you are subscribed to the Google > >> >> >> Groups > >> >> >> "hackerspace_brisbane" group. > >> >> >> To post to this group, send email to > >> >> >> hackerspace_brisbane@googlegroups.com. > >> >> >> To unsubscribe from this group, send email to > >> >> >> hackerspace_brisbane+unsubscribe@googlegroups.com. > >> >> >> For more options, visit this group at > >> >> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >> >> > -- > >> >> > You received this message because you are subscribed to the Google > >> >> > Groups > >> >> > "hackerspace_brisbane" group. > >> >> > To post to this group, send email to > >> >> > hackerspace_brisbane@googlegroups.com. > >> >> > To unsubscribe from this group, send email to > >> >> > hackerspace_brisbane+unsubscribe@googlegroups.com. > >> >> > For more options, visit this group at > >> >> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >> >> -- > >> >> Daniel Harmsworth > >> >> Chairman, The Perth Artifactory Inc. > >> >> http://www.artifactory.org.au
> -- > You received this message because you are subscribed to the Google Groups > "hackerspace_brisbane" group. > To post to this group, send email to hackerspace_brisbane@googlegroups.com > . > To unsubscribe from this group, send email to > hackerspace_brisbane+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/hackerspace_brisbane?hl=en.
-- You received this message because you are subscribed to the Google Groups "hackerspace_brisbane" group. To post to this group, send email to hackerspace_brisbane@googlegroups.com. To unsubscribe from this group, send email to hackerspace_brisbane+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/hackerspace_brisbane?hl=en.
On Sun, Sep 4, 2011 at 8:06 PM, Lemming . <inert...@gmail.com> wrote: > Cool, I'm fine with that, so long as the group is fine with me buying parts > to do so. We've tried kludging it a number of times now and it seems to just > keep failing. I think it's time we admitted defeat and buy a working > solution.
> ------------------------------ > From: buzz <davidb...@gmail.com> > Sent: Sunday, 4 September 2011 19:58 > To: hackerspace_brisbane@googlegroups.com < > hackerspace_brisbane@googlegroups.com>
> Subject: Re: Recent issues with the door controller.
> I've tried to fix it, James has tried to fix it, maybe it's your turn?
> On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote:
>> At the space again, and again the door isn't working. Don't have my >> keys with me. We need to fix this ASAP so that the door is reliable, >> because atm it isn't.
>> From: Daniel Harmsworth <danielharmswo...@gmail.com> >> Sent: Sunday, 4 September 2011 15:58 >> To: Lemming . <inert...@gmail.com> >> Subject: Re: Recent issues with the door controller. >> Controllers we're building should cope with 150+ Amps, if thats any help
>> On 4 September 2011 13:56, Lemming . <inert...@gmail.com> wrote: >> > we already tried that, it's 24v at quite a lot of amps, the shoot >> through is >> > impressive...
>> > On 4 September 2011 15:55, Daniel Harmsworth < >> danielharmswo...@gmail.com> >> > wrote:
>> >> Bog standard double H bridge would do it very cleanly. I am likely >> >> getting a bunch of PCB's for these fabricated for work in the next >> >> month or so, I can send a couple over if you like.
>> >> On 4 September 2011 13:50, Lemming . <inert...@gmail.com> wrote: >> >> > It needs to drive the door both up and down, so we'd need a couple of >> >> > them.
>> >> > I was just looking at using one of those pololu controllers because >> they >> >> > are >> >> > designed to do that already, and they are pretty beefy. >> >> > On 2 September 2011 19:27, Daniel Harmsworth >> >> > <danielharmswo...@gmail.com> >> >> > wrote:
>> >> >> Not replying on list as it seems a bit of a sensitive subject and I >> >> >> didnt want to tread on anybody's toes, but is there a reason you >> guys >> >> >> need to use a mechanical switch? A solid-state relay that can handle >> >> >> upwards of 40A only costs on the order of $30, we've used them for a >> >> >> bunch of projects dealing with high current devices and had >> excellent >> >> >> results. To run it off of an arduino you just need a bog standard >> >> >> signal transistor off of a 5v rail into the SSR input.
>> >> >> Just a thought.
>> >> >> Happy Hacking!
>> >> >> On 2 September 2011 14:28, Lemming . <inert...@gmail.com> wrote: >> >> >> > Hey guys, was leaving work to head here and Rachael rang me to say >> >> >> > the >> >> >> > door >> >> >> > was not working again. >> >> >> > Headed over here and it appears the switch is not making proper >> >> >> > contact >> >> >> > (pushed it to the open position and nada, wiggled it a bit and it >> >> >> > worked) >> >> >> > and also the servo doesn't seem to be moving quite far enough to >> >> >> > positively >> >> >> > engage the switch every time. >> >> >> > Personally I think either the current solution needs to be >> improved >> >> >> > to >> >> >> > make >> >> >> > it more reliable (2 failures in a week that I know of) or we try a >> >> >> > different >> >> >> > solution >> >> >> > On 26 August 2011 11:03, tjhowse <tjho...@gmail.com> wrote:
>> >> >> >> The current solution is good. I don't see any reason to change. >> >> >> >> We've >> >> >> >> invested the time getting it working, I don't see any benefit in >> >> >> >> investing >> >> >> >> more money in a replacement system which would have its own >> >> >> >> drawbacks >> >> >> >> and >> >> >> >> settling in period.
>> >> >> >> On 26 August 2011 01:21, James Churchill <pel...@gmail.com> >> wrote:
>> >> >> >>> On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> >> >> >> >>> wrote: >> >> >> >>> > it's that the door >> >> >> >>> > seems to be constantly failing...
>> >> >> >>> And my point is that perception is incorrect.
>> >> >> >>> Again, *only* look at the problems that have occurred since >> tuesday >> >> >> >>> last week; anything before that date was on the old setup which >> has >> >> >> >>> been completely thrown out.
>> >> >> >>> - James
>> >> >> >>> -- >> >> >> >>> You received this message because you are subscribed to the >> Google >> >> >> >>> Groups >> >> >> >>> "hackerspace_brisbane" group. >> >> >> >>> To post to this group, send email to >> >> >> >>> hackerspace_brisbane@googlegroups.com. >> >> >> >>> To unsubscribe from this group, send email to >> >> >> >>> hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >> >>> For more options, visit this group at >> >> >> >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> >> >> -- >> >> >> >> You received this message because you are subscribed to the >> Google >> >> >> >> Groups >> >> >> >> "hackerspace_brisbane" group. >> >> >> >> To post to this group, send email to >> >> >> >> hackerspace_brisbane@googlegroups.com. >> >> >> >> To unsubscribe from this group, send email to >> >> >> >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >> >> For more options, visit this group at >> >> >> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> >> > -- >> >> >> > You received this message because you are subscribed to the Google >> >> >> > Groups >> >> >> > "hackerspace_brisbane" group. >> >> >> > To post to this group, send email to >> >> >> > hackerspace_brisbane@googlegroups.com. >> >> >> > To unsubscribe from this group, send email to >> >> >> > hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >> > For more options, visit this group at >> >> >> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> >> -- >> >> >> Daniel Harmsworth >> >> >> Chairman, The Perth Artifactory Inc. >> >> >> http://www.artifactory.org.au
>> -- >> You received this message because you are subscribed to the Google Groups >> "hackerspace_brisbane" group. >> To post to this group, send email to >> hackerspace_brisbane@googlegroups.com. >> To unsubscribe from this group, send email to >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> -- > You received this message because you are subscribed to the Google Groups > "hackerspace_brisbane" group. > To post to this group, send email to hackerspace_brisbane@googlegroups.com > . > To unsubscribe from this group, send email to > hackerspace_brisbane+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/hackerspace_brisbane?hl=en.
> -- > You received this message because you are subscribed to the Google Groups > "hackerspace_brisbane" group. > To post to this group, send email to hackerspace_brisbane@googlegroups.com > . > To unsubscribe from this group, send email to > hackerspace_brisbane+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/hackerspace_brisbane?hl=en.
> On Sun, Sep 4, 2011 at 8:06 PM, Lemming . <inert...@gmail.com> wrote:
>> Cool, I'm fine with that, so long as the group is fine with me buying >> parts to do so. We've tried kludging it a number of times now and it seems >> to just keep failing. I think it's time we admitted defeat and buy a working >> solution.
>> ________________________________ >> From: buzz <davidb...@gmail.com> >> Sent: Sunday, 4 September 2011 19:58 >> To: hackerspace_brisbane@googlegroups.com >> <hackerspace_brisbane@googlegroups.com> >> Subject: Re: Recent issues with the door controller.
>> I've tried to fix it, James has tried to fix it, maybe it's your turn?
>> On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote:
>>> At the space again, and again the door isn't working. Don't have my >>> keys with me. We need to fix this ASAP so that the door is reliable, >>> because atm it isn't.
>>> From: Daniel Harmsworth <danielharmswo...@gmail.com> >>> Sent: Sunday, 4 September 2011 15:58 >>> To: Lemming . <inert...@gmail.com> >>> Subject: Re: Recent issues with the door controller. >>> Controllers we're building should cope with 150+ Amps, if thats any help
>>> On 4 September 2011 13:56, Lemming . <inert...@gmail.com> wrote: >>> > we already tried that, it's 24v at quite a lot of amps, the shoot >>> > through is >>> > impressive...
>>> > On 4 September 2011 15:55, Daniel Harmsworth >>> > <danielharmswo...@gmail.com> >>> > wrote:
>>> >> Bog standard double H bridge would do it very cleanly. I am likely >>> >> getting a bunch of PCB's for these fabricated for work in the next >>> >> month or so, I can send a couple over if you like.
>>> >> On 4 September 2011 13:50, Lemming . <inert...@gmail.com> wrote: >>> >> > It needs to drive the door both up and down, so we'd need a couple >>> >> > of >>> >> > them.
>>> >> > I was just looking at using one of those pololu controllers because >>> >> > they >>> >> > are >>> >> > designed to do that already, and they are pretty beefy. >>> >> > On 2 September 2011 19:27, Daniel Harmsworth >>> >> > <danielharmswo...@gmail.com> >>> >> > wrote:
>>> >> >> Not replying on list as it seems a bit of a sensitive subject and I >>> >> >> didnt want to tread on anybody's toes, but is there a reason you >>> >> >> guys >>> >> >> need to use a mechanical switch? A solid-state relay that can >>> >> >> handle >>> >> >> upwards of 40A only costs on the order of $30, we've used them for >>> >> >> a >>> >> >> bunch of projects dealing with high current devices and had >>> >> >> excellent >>> >> >> results. To run it off of an arduino you just need a bog standard >>> >> >> signal transistor off of a 5v rail into the SSR input.
>>> >> >> Just a thought.
>>> >> >> Happy Hacking!
>>> >> >> On 2 September 2011 14:28, Lemming . <inert...@gmail.com> wrote: >>> >> >> > Hey guys, was leaving work to head here and Rachael rang me to >>> >> >> > say >>> >> >> > the >>> >> >> > door >>> >> >> > was not working again. >>> >> >> > Headed over here and it appears the switch is not making proper >>> >> >> > contact >>> >> >> > (pushed it to the open position and nada, wiggled it a bit and it >>> >> >> > worked) >>> >> >> > and also the servo doesn't seem to be moving quite far enough to >>> >> >> > positively >>> >> >> > engage the switch every time. >>> >> >> > Personally I think either the current solution needs to be >>> >> >> > improved >>> >> >> > to >>> >> >> > make >>> >> >> > it more reliable (2 failures in a week that I know of) or we try >>> >> >> > a >>> >> >> > different >>> >> >> > solution >>> >> >> > On 26 August 2011 11:03, tjhowse <tjho...@gmail.com> wrote:
>>> >> >> >> The current solution is good. I don't see any reason to change. >>> >> >> >> We've >>> >> >> >> invested the time getting it working, I don't see any benefit in >>> >> >> >> investing >>> >> >> >> more money in a replacement system which would have its own >>> >> >> >> drawbacks >>> >> >> >> and >>> >> >> >> settling in period.
>>> >> >> >> On 26 August 2011 01:21, James Churchill <pel...@gmail.com> >>> >> >> >> wrote:
>>> >> >> >>> On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> >>> >> >> >>> wrote: >>> >> >> >>> > it's that the door >>> >> >> >>> > seems to be constantly failing...
>>> >> >> >>> And my point is that perception is incorrect.
>>> >> >> >>> Again, *only* look at the problems that have occurred since >>> >> >> >>> tuesday >>> >> >> >>> last week; anything before that date was on the old setup which >>> >> >> >>> has >>> >> >> >>> been completely thrown out.
>>> >> >> >>> - James
>>> >> >> >>> -- >>> >> >> >>> You received this message because you are subscribed to the >>> >> >> >>> Google >>> >> >> >>> Groups >>> >> >> >>> "hackerspace_brisbane" group. >>> >> >> >>> To post to this group, send email to >>> >> >> >>> hackerspace_brisbane@googlegroups.com. >>> >> >> >>> To unsubscribe from this group, send email to >>> >> >> >>> hackerspace_brisbane+unsubscribe@googlegroups.com. >>> >> >> >>> For more options, visit this group at >>> >> >> >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>> >> >> >> -- >>> >> >> >> You received this message because you are subscribed to the >>> >> >> >> Google >>> >> >> >> Groups >>> >> >> >> "hackerspace_brisbane" group. >>> >> >> >> To post to this group, send email to >>> >> >> >> hackerspace_brisbane@googlegroups.com. >>> >> >> >> To unsubscribe from this group, send email to >>> >> >> >> hackerspace_brisbane+unsubscribe@googlegroups.com. >>> >> >> >> For more options, visit this group at >>> >> >> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>> >> >> > -- >>> >> >> > You received this message because you are subscribed to the >>> >> >> > Google >>> >> >> > Groups >>> >> >> > "hackerspace_brisbane" group. >>> >> >> > To post to this group, send email to >>> >> >> > hackerspace_brisbane@googlegroups.com. >>> >> >> > To unsubscribe from this group, send email to >>> >> >> > hackerspace_brisbane+unsubscribe@googlegroups.com. >>> >> >> > For more options, visit this group at >>> >> >> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
>>> >> >> -- >>> >> >> Daniel Harmsworth >>> >> >> Chairman, The Perth Artifactory Inc. >>> >> >> http://www.artifactory.org.au
>>> -- >>> You received this message because you are subscribed to the Google Groups >>> "hackerspace_brisbane" group. >>> To post to this group, send email to >>> hackerspace_brisbane@googlegroups.com. >>> To unsubscribe from this group, send email to >>> hackerspace_brisbane+unsubscribe@googlegroups.com. >>> For more options, visit this group at >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> -- >> You received this message because you are subscribed to the Google Groups >> "hackerspace_brisbane" group. >> To post to this group, send email to >> hackerspace_brisbane@googlegroups.com. >> To unsubscribe from this group, send email to >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> -- >> You received this message because you are subscribed to the Google Groups >> "hackerspace_brisbane" group. >> To post to this group, send email to >> hackerspace_brisbane@googlegroups.com. >> To unsubscribe from this group, send email to >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> -- > You received this message because you are subscribed to the Google Groups > "hackerspace_brisbane" group. > To post to this group, send email to hackerspace_brisbane@googlegroups.com. > To unsubscribe from this group, send email to > hackerspace_brisbane+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/hackerspace_brisbane?hl=en.
> On 4 September 2011 20:11, Craig Rippon <Craig.Rip...@carder.net.au> > wrote: > > padlock?
> > On Sun, Sep 4, 2011 at 8:06 PM, Lemming . <inert...@gmail.com> wrote:
> >> Cool, I'm fine with that, so long as the group is fine with me buying > >> parts to do so. We've tried kludging it a number of times now and it > seems > >> to just keep failing. I think it's time we admitted defeat and buy a > working > >> solution.
> >> ________________________________ > >> From: buzz <davidb...@gmail.com> > >> Sent: Sunday, 4 September 2011 19:58 > >> To: hackerspace_brisbane@googlegroups.com > >> <hackerspace_brisbane@googlegroups.com> > >> Subject: Re: Recent issues with the door controller.
> >> I've tried to fix it, James has tried to fix it, maybe it's your turn?
> >> On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote:
> >>> At the space again, and again the door isn't working. Don't have my > >>> keys with me. We need to fix this ASAP so that the door is reliable, > >>> because atm it isn't.
> >>> From: Daniel Harmsworth <danielharmswo...@gmail.com> > >>> Sent: Sunday, 4 September 2011 15:58 > >>> To: Lemming . <inert...@gmail.com> > >>> Subject: Re: Recent issues with the door controller. > >>> Controllers we're building should cope with 150+ Amps, if thats any > help
> >>> On 4 September 2011 13:56, Lemming . <inert...@gmail.com> wrote: > >>> > we already tried that, it's 24v at quite a lot of amps, the shoot > >>> > through is > >>> > impressive...
> >>> > On 4 September 2011 15:55, Daniel Harmsworth > >>> > <danielharmswo...@gmail.com> > >>> > wrote:
> >>> >> Bog standard double H bridge would do it very cleanly. I am likely > >>> >> getting a bunch of PCB's for these fabricated for work in the next > >>> >> month or so, I can send a couple over if you like.
> >>> >> On 4 September 2011 13:50, Lemming . <inert...@gmail.com> wrote: > >>> >> > It needs to drive the door both up and down, so we'd need a couple > >>> >> > of > >>> >> > them.
> >>> >> > I was just looking at using one of those pololu controllers > because > >>> >> > they > >>> >> > are > >>> >> > designed to do that already, and they are pretty beefy. > >>> >> > On 2 September 2011 19:27, Daniel Harmsworth > >>> >> > <danielharmswo...@gmail.com> > >>> >> > wrote:
> >>> >> >> Not replying on list as it seems a bit of a sensitive subject and > I > >>> >> >> didnt want to tread on anybody's toes, but is there a reason you > >>> >> >> guys > >>> >> >> need to use a mechanical switch? A solid-state relay that can > >>> >> >> handle > >>> >> >> upwards of 40A only costs on the order of $30, we've used them > for > >>> >> >> a > >>> >> >> bunch of projects dealing with high current devices and had > >>> >> >> excellent > >>> >> >> results. To run it off of an arduino you just need a bog standard > >>> >> >> signal transistor off of a 5v rail into the SSR input.
> >>> >> >> Just a thought.
> >>> >> >> Happy Hacking!
> >>> >> >> On 2 September 2011 14:28, Lemming . <inert...@gmail.com> wrote: > >>> >> >> > Hey guys, was leaving work to head here and Rachael rang me to > >>> >> >> > say > >>> >> >> > the > >>> >> >> > door > >>> >> >> > was not working again. > >>> >> >> > Headed over here and it appears the switch is not making proper > >>> >> >> > contact > >>> >> >> > (pushed it to the open position and nada, wiggled it a bit and > it > >>> >> >> > worked) > >>> >> >> > and also the servo doesn't seem to be moving quite far enough > to > >>> >> >> > positively > >>> >> >> > engage the switch every time. > >>> >> >> > Personally I think either the current solution needs to be > >>> >> >> > improved > >>> >> >> > to > >>> >> >> > make > >>> >> >> > it more reliable (2 failures in a week that I know of) or we > try > >>> >> >> > a > >>> >> >> > different > >>> >> >> > solution > >>> >> >> > On 26 August 2011 11:03, tjhowse <tjho...@gmail.com> wrote:
> >>> >> >> >> The current solution is good. I don't see any reason to > change. > >>> >> >> >> We've > >>> >> >> >> invested the time getting it working, I don't see any benefit > in > >>> >> >> >> investing > >>> >> >> >> more money in a replacement system which would have its own > >>> >> >> >> drawbacks > >>> >> >> >> and > >>> >> >> >> settling in period.
> >>> >> >> >> On 26 August 2011 01:21, James Churchill <pel...@gmail.com> > >>> >> >> >> wrote:
> >>> >> >> >>> On 26 August 2011 01:06, Captain Niobe < > captainni...@gmail.com> > >>> >> >> >>> wrote: > >>> >> >> >>> > it's that the door > >>> >> >> >>> > seems to be constantly failing...
> >>> >> >> >>> And my point is that perception is incorrect.
> >>> >> >> >>> Again, *only* look at the problems that have occurred since > >>> >> >> >>> tuesday > >>> >> >> >>> last week; anything before that date was on the old setup > which > >>> >> >> >>> has > >>> >> >> >>> been completely thrown out.
> >>> >> >> >>> - James
> >>> >> >> >>> -- > >>> >> >> >>> You received this message because you are subscribed to the > >>> >> >> >>> Google > >>> >> >> >>> Groups > >>> >> >> >>> "hackerspace_brisbane" group. > >>> >> >> >>> To post to this group, send email to > >>> >> >> >>> hackerspace_brisbane@googlegroups.com. > >>> >> >> >>> To unsubscribe from this group, send email to > >>> >> >> >>> hackerspace_brisbane+unsubscribe@googlegroups.com. > >>> >> >> >>> For more options, visit this group at > >>> >> >> >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >>> >> >> >> -- > >>> >> >> >> You received this message because you are subscribed to the > >>> >> >> >> Google > >>> >> >> >> Groups > >>> >> >> >> "hackerspace_brisbane" group. > >>> >> >> >> To post to this group, send email to > >>> >> >> >> hackerspace_brisbane@googlegroups.com. > >>> >> >> >> To unsubscribe from this group, send email to > >>> >> >> >> hackerspace_brisbane+unsubscribe@googlegroups.com. > >>> >> >> >> For more options, visit this group at > >>> >> >> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >>> >> >> > -- > >>> >> >> > You received this message because you are subscribed to the > >>> >> >> > Google > >>> >> >> > Groups > >>> >> >> > "hackerspace_brisbane" group. > >>> >> >> > To post to this group, send email to > >>> >> >> > hackerspace_brisbane@googlegroups.com. > >>> >> >> > To unsubscribe from this group, send email to > >>> >> >> > hackerspace_brisbane+unsubscribe@googlegroups.com. > >>> >> >> > For more options, visit this group at > >>> >> >> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
> >>> >> >> -- > >>> >> >> Daniel Harmsworth > >>> >> >> Chairman, The Perth Artifactory Inc. > >>> >> >> http://www.artifactory.org.au
> >>> >> -- > >>> >> Daniel Harmsworth > >>> >> Chairman, The Perth Artifactory Inc. > >>> >> http://www.artifactory.org.au
> >>> -- > >>> You received this message because you are subscribed to the Google > Groups > >>> "hackerspace_brisbane" group. > >>> To post to this group, send email to > >>> hackerspace_brisbane@googlegroups.com. > >>> To unsubscribe from this group, send email to > >>> hackerspace_brisbane+unsubscribe@googlegroups.com. > >>> For more options, visit this group at > >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
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If it's within the $50/mo discretionary funding, just do it. It probably won't be, though.
In which case if we have to vote on it then we should also look at an off-the-shelf solution which replaces some or all of the existing system. I believe we still want RFID and logging, and our existing Arduino setup does that (almost) flawlessly, so we just need a massive H-bridge type circuit with simple "go up" and "go down" controls which can be driven from the arduino.
Possible improvement: add sounds when the user is recognised or rejected (which is cool enough on its own), so you know the arduino works, but the door circuit isn't working.
On Sun, Sep 4, 2011 at 8:06 PM, Lemming . <inert...@gmail.com> wrote: > Cool, I'm fine with that, so long as the group is fine with me buying parts > to do so. We've tried kludging it a number of times now and it seems to just > keep failing. I think it's time we admitted defeat and buy a working > solution.
> ________________________________ > From: buzz <davidb...@gmail.com> > Sent: Sunday, 4 September 2011 19:58 > To: hackerspace_brisbane@googlegroups.com > <hackerspace_brisbane@googlegroups.com> > Subject: Re: Recent issues with the door controller.
> I've tried to fix it, James has tried to fix it, maybe it's your turn?
> On Sun, Sep 4, 2011 at 7:08 PM, Lemming . <inert...@gmail.com> wrote:
>> At the space again, and again the door isn't working. Don't have my >> keys with me. We need to fix this ASAP so that the door is reliable, >> because atm it isn't.
>> From: Daniel Harmsworth <danielharmswo...@gmail.com> >> Sent: Sunday, 4 September 2011 15:58 >> To: Lemming . <inert...@gmail.com> >> Subject: Re: Recent issues with the door controller. >> Controllers we're building should cope with 150+ Amps, if thats any help
>> On 4 September 2011 13:56, Lemming . <inert...@gmail.com> wrote: >> > we already tried that, it's 24v at quite a lot of amps, the shoot >> > through is >> > impressive...
>> > On 4 September 2011 15:55, Daniel Harmsworth >> > <danielharmswo...@gmail.com> >> > wrote:
>> >> Bog standard double H bridge would do it very cleanly. I am likely >> >> getting a bunch of PCB's for these fabricated for work in the next >> >> month or so, I can send a couple over if you like.
>> >> On 4 September 2011 13:50, Lemming . <inert...@gmail.com> wrote: >> >> > It needs to drive the door both up and down, so we'd need a couple of >> >> > them.
>> >> > I was just looking at using one of those pololu controllers because >> >> > they >> >> > are >> >> > designed to do that already, and they are pretty beefy. >> >> > On 2 September 2011 19:27, Daniel Harmsworth >> >> > <danielharmswo...@gmail.com> >> >> > wrote:
>> >> >> Not replying on list as it seems a bit of a sensitive subject and I >> >> >> didnt want to tread on anybody's toes, but is there a reason you >> >> >> guys >> >> >> need to use a mechanical switch? A solid-state relay that can handle >> >> >> upwards of 40A only costs on the order of $30, we've used them for a >> >> >> bunch of projects dealing with high current devices and had >> >> >> excellent >> >> >> results. To run it off of an arduino you just need a bog standard >> >> >> signal transistor off of a 5v rail into the SSR input.
>> >> >> Just a thought.
>> >> >> Happy Hacking!
>> >> >> On 2 September 2011 14:28, Lemming . <inert...@gmail.com> wrote: >> >> >> > Hey guys, was leaving work to head here and Rachael rang me to say >> >> >> > the >> >> >> > door >> >> >> > was not working again. >> >> >> > Headed over here and it appears the switch is not making proper >> >> >> > contact >> >> >> > (pushed it to the open position and nada, wiggled it a bit and it >> >> >> > worked) >> >> >> > and also the servo doesn't seem to be moving quite far enough to >> >> >> > positively >> >> >> > engage the switch every time. >> >> >> > Personally I think either the current solution needs to be >> >> >> > improved >> >> >> > to >> >> >> > make >> >> >> > it more reliable (2 failures in a week that I know of) or we try a >> >> >> > different >> >> >> > solution >> >> >> > On 26 August 2011 11:03, tjhowse <tjho...@gmail.com> wrote:
>> >> >> >> The current solution is good. I don't see any reason to change. >> >> >> >> We've >> >> >> >> invested the time getting it working, I don't see any benefit in >> >> >> >> investing >> >> >> >> more money in a replacement system which would have its own >> >> >> >> drawbacks >> >> >> >> and >> >> >> >> settling in period.
>> >> >> >> On 26 August 2011 01:21, James Churchill <pel...@gmail.com> >> >> >> >> wrote:
>> >> >> >>> On 26 August 2011 01:06, Captain Niobe <captainni...@gmail.com> >> >> >> >>> wrote: >> >> >> >>> > it's that the door >> >> >> >>> > seems to be constantly failing...
>> >> >> >>> And my point is that perception is incorrect.
>> >> >> >>> Again, *only* look at the problems that have occurred since >> >> >> >>> tuesday >> >> >> >>> last week; anything before that date was on the old setup which >> >> >> >>> has >> >> >> >>> been completely thrown out.
>> >> >> >>> - James
>> >> >> >>> -- >> >> >> >>> You received this message because you are subscribed to the >> >> >> >>> Google >> >> >> >>> Groups >> >> >> >>> "hackerspace_brisbane" group. >> >> >> >>> To post to this group, send email to >> >> >> >>> hackerspace_brisbane@googlegroups.com. >> >> >> >>> To unsubscribe from this group, send email to >> >> >> >>> hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >> >>> For more options, visit this group at >> >> >> >>> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> >> >> -- >> >> >> >> You received this message because you are subscribed to the >> >> >> >> Google >> >> >> >> Groups >> >> >> >> "hackerspace_brisbane" group. >> >> >> >> To post to this group, send email to >> >> >> >> hackerspace_brisbane@googlegroups.com. >> >> >> >> To unsubscribe from this group, send email to >> >> >> >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >> >> For more options, visit this group at >> >> >> >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> >> > -- >> >> >> > You received this message because you are subscribed to the Google >> >> >> > Groups >> >> >> > "hackerspace_brisbane" group. >> >> >> > To post to this group, send email to >> >> >> > hackerspace_brisbane@googlegroups.com. >> >> >> > To unsubscribe from this group, send email to >> >> >> > hackerspace_brisbane+unsubscribe@googlegroups.com. >> >> >> > For more options, visit this group at >> >> >> > http://groups.google.com/group/hackerspace_brisbane?hl=en.
>> >> >> -- >> >> >> Daniel Harmsworth >> >> >> Chairman, The Perth Artifactory Inc. >> >> >> http://www.artifactory.org.au
>> -- >> You received this message because you are subscribed to the Google Groups >> "hackerspace_brisbane" group. >> To post to this group, send email to >> hackerspace_brisbane@googlegroups.com. >> To unsubscribe from this group, send email to >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
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Set your arduino so that it turns off the mosfets, then waits about 100ms for the current to decay, then flips the switch, waits some more for your servo to catch up, then re-applies current to the mosfets?
You could even make it flip the switch when it reaches the end of the travel, so it's ready for instant application of power when it's told to send it the other way.
Remember to add proper snubbing to protect the mosfets- big diodes and maybe some resistors to help burn off the magnetic field. Their internal diodes won't help at all despite what many people seem to think, and that motor sounds like it'll easily exceed their max avalanche energy.
If this was not a critical system I would be fine with trying to build a controller again and potentially having a few weeks more of bumpy operation. The problem we keep running into with this thing is the rather horrendous amount of current this motor seems to draw when, and that the batteries are more than happy to provide it!
I will start looking into options, I think the pololu controller I first linked will be able to handle it but it doesn't have built in overcurrent shutoff. If anyone has any ideas for motor controllers off the shelf or other parts of the system they think could be improved feel free to chime in.
I also thinking greasing the tracks for the door would help the situation, will grab some this week and try and do it.
From: Triffid Hunter <triffid.hun...@gmail.com> Sent: Sunday, 4 September 2011 21:27 To: hackerspace_brisbane@googlegroups.com <hackerspace_brisbane@googlegroups.com> Subject: Re: Recent issues with the door controller. The switch can't handle the arcing during connect and disconnection. the mosfets weren't being driven properly, and/or couldn't take the current.
How about, use the switch for forward/reverse, and a bank of paralleled mosfets for actual current control?
Set your arduino so that it turns off the mosfets, then waits about 100ms for the current to decay, then flips the switch, waits some more for your servo to catch up, then re-applies current to the mosfets?
You could even make it flip the switch when it reaches the end of the travel, so it's ready for instant application of power when it's told to send it the other way.
Remember to add proper snubbing to protect the mosfets- big diodes and maybe some resistors to help burn off the magnetic field. Their internal diodes won't help at all despite what many people seem to think, and that motor sounds like it'll easily exceed their max avalanche energy.
Got endstops yet?
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On Sun, Sep 4, 2011 at 10:34 PM, Lemming . <inert...@gmail.com> wrote: > The problem we keep running into with this thing is the > rather horrendous amount of current this motor seems to draw when, and > that the batteries are more than happy to provide it!
Any ideas exactly how much that is? DC resistance of the motor and ohm's law should give a good ballpark figure.
My proposal should be good up to a few hundred amps, if you use decent mosfets, ie ones with low Rds(on), Vds(max) of at least 30v and a package you can bolt a lot of to a heatsink without much work.
I would suggest IRL3803, because I have a bunch of them and they can carry 15A with /no/ heatsink and a mere 5v gate drive. With a substantial heatsink (eg 2c/w), one should be able to carry over 60A.
8 of those in parallel on a big heatsink, plus a good diode or 10 to catch the flyback pulse, and a reversing switch that can handle the DC current (but not necessarily the switch-off arc) should solve your door woes. They'll need a decent gate driver, 74hc244 perhaps with one output per gate. IRL3803's downside is its high gate charge (140nC) which means at 10mA gate drive, it takes about 14uS to switch.
Futurlec carry IRL3803 at $0.90/ea but you may not want to wait for their postage, see what else is available. Perhaps you already have some suitable mosfets in the space waiting to be discovered?
I don't know if jaycar and friends carry anything with a usably low Rds(on) - maximum for this is about 10mR. Last time I checked, their mosfet selection was less than stellar, but that was several years ago now.
As has already been mentioned, there has already been a couple of attempts of making a controller for it. One of which was pretty much what you are talking about.
At this stage I'd rather try and get an off the shelf system so that I know someone has already put in the hard work tracing down all the foibles of the system and we don't have to find out what they are when the magic blue smoke escapes yet again. High current DC motor driver design is not a simple thing as many people can attest to and, for a critical system at least, is best left to the experts.
Also what you spend on buying parts piecemeal pretty quickly adds up to near enough the cost of one of the driver modules anyway.
Pros: They are very nice drivers, have built in current sensors (30A limit) and are easy to get. Cons: No overcurrent or thermal protection, overcurrent can't be done with the current sensor as it maxes out long before the controller does (for peaks anyway)
> On Sun, Sep 4, 2011 at 10:34 PM, Lemming . <inert...@gmail.com> wrote: > > The problem we keep running into with this thing is the > > rather horrendous amount of current this motor seems to draw when, and > > that the batteries are more than happy to provide it!
> Any ideas exactly how much that is? DC resistance of the motor and > ohm's law should give a good ballpark figure.
> My proposal should be good up to a few hundred amps, if you use decent > mosfets, ie ones with low Rds(on), Vds(max) of at least 30v and a > package you can bolt a lot of to a heatsink without much work.
> I would suggest IRL3803, because I have a bunch of them and they can > carry 15A with /no/ heatsink and a mere 5v gate drive. With a > substantial heatsink (eg 2c/w), one should be able to carry over 60A.
> 8 of those in parallel on a big heatsink, plus a good diode or 10 to > catch the flyback pulse, and a reversing switch that can handle the DC > current (but not necessarily the switch-off arc) should solve your > door woes. They'll need a decent gate driver, 74hc244 perhaps with one > output per gate. IRL3803's downside is its high gate charge (140nC) > which means at 10mA gate drive, it takes about 14uS to switch.
> Futurlec carry IRL3803 at $0.90/ea but you may not want to wait for > their postage, see what else is available. Perhaps you already have > some suitable mosfets in the space waiting to be discovered?
> I don't know if jaycar and friends carry anything with a usably low > Rds(on) - maximum for this is about 10mR. Last time I checked, their > mosfet selection was less than stellar, but that was several years ago > now.
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The pololu 24v23 is the one to get out of those three. Potential max input voltage is only a bit above 30v, so the other pololu's higher voltage limit is unnecessary (and would give us a lower current limit.) The peak and continuous current limits are ridiculously generous, so overcurrent isn't a concern. Of course, we should bung a heatsink on it just to be sure.
- James
On 5 September 2011 00:54, Lemming . <inert...@gmail.com> wrote:
> As has already been mentioned, there has already been a couple of attempts > of making a controller for it. One of which was pretty much what you are > talking about.
> At this stage I'd rather try and get an off the shelf system so that I know > someone has already put in the hard work tracing down all the foibles of the > system and we don't have to find out what they are when the magic blue smoke > escapes yet again. High current DC motor driver design is not a simple thing > as many people can attest to and, for a critical system at least, is best > left to the experts. > Also what you spend on buying parts piecemeal pretty quickly adds up to near > enough the cost of one of the driver modules anyway. > http://www.pololu.com/catalog/product/1456 or > http://www.pololu.com/catalog/product/1457 > Pros: They are very nice drivers, have built in current sensors (30A limit) > and are easy to get. > Cons: No overcurrent or thermal protection, overcurrent can't be done with > the current sensor as it maxes out long before the controller does (for > peaks anyway) > http://www.dimensionengineering.com/SyRen25.htm > Pros: configurable++, Overcurrent and thermal protection. > Cons: Kinda overkill, bit more expensive, 1 week lead time.
> On 4 September 2011 23:04, Triffid Hunter <triffid.hun...@gmail.com> wrote:
>> On Sun, Sep 4, 2011 at 10:34 PM, Lemming . <inert...@gmail.com> wrote: >> > The problem we keep running into with this thing is the >> > rather horrendous amount of current this motor seems to draw when, and >> > that the batteries are more than happy to provide it!
>> Any ideas exactly how much that is? DC resistance of the motor and >> ohm's law should give a good ballpark figure.
>> My proposal should be good up to a few hundred amps, if you use decent >> mosfets, ie ones with low Rds(on), Vds(max) of at least 30v and a >> package you can bolt a lot of to a heatsink without much work.
>> I would suggest IRL3803, because I have a bunch of them and they can >> carry 15A with /no/ heatsink and a mere 5v gate drive. With a >> substantial heatsink (eg 2c/w), one should be able to carry over 60A.
>> 8 of those in parallel on a big heatsink, plus a good diode or 10 to >> catch the flyback pulse, and a reversing switch that can handle the DC >> current (but not necessarily the switch-off arc) should solve your >> door woes. They'll need a decent gate driver, 74hc244 perhaps with one >> output per gate. IRL3803's downside is its high gate charge (140nC) >> which means at 10mA gate drive, it takes about 14uS to switch.
>> Futurlec carry IRL3803 at $0.90/ea but you may not want to wait for >> their postage, see what else is available. Perhaps you already have >> some suitable mosfets in the space waiting to be discovered?
>> I don't know if jaycar and friends carry anything with a usably low >> Rds(on) - maximum for this is about 10mR. Last time I checked, their >> mosfet selection was less than stellar, but that was several years ago >> now.
>> -- >> You received this message because you are subscribed to the Google Groups >> "hackerspace_brisbane" group. >> To post to this group, send email to >> hackerspace_brisbane@googlegroups.com. >> To unsubscribe from this group, send email to >> hackerspace_brisbane+unsubscribe@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/hackerspace_brisbane?hl=en.
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I.be seen that motor fuse up a 35Amp relay in minutes so its got to be peaking well over that. maybe upto 100? On Sep 5, 2011 4:02 AM, "James Churchill" <pel...@gmail.com> wrote:
> The pololu 24v23 is the one to get out of those three. Potential max > input voltage is only a bit above 30v, so the other pololu's higher > voltage limit is unnecessary (and would give us a lower current > limit.) The peak and continuous current limits are ridiculously > generous, so overcurrent isn't a concern. Of course, we should bung a > heatsink on it just to be sure.
> - James
> On 5 September 2011 00:54, Lemming . <inert...@gmail.com> wrote: > > As has already been mentioned, there has already been a couple of attempts > > of making a controller for it. One of which was pretty much what you are > > talking about.
> > At this stage I'd rather try and get an off the shelf system so that I know > > someone has already put in the hard work tracing down all the foibles of the > > system and we don't have to find out what they are when the magic blue smoke > > escapes yet again. High current DC motor driver design is not a simple thing > > as many people can attest to and, for a critical system at least, is best > > left to the experts. > > Also what you spend on buying parts piecemeal pretty quickly adds up to near > > enough the cost of one of the driver modules anyway. > > http://www.pololu.com/catalog/product/1456 or > > http://www.pololu.com/catalog/product/1457 > > Pros: They are very nice drivers, have built in current sensors (30A limit) > > and are easy to get. > > Cons: No overcurrent or thermal protection, overcurrent can't be done with > > the current sensor as it maxes out long before the controller does (for > > peaks anyway) > > http://www.dimensionengineering.com/SyRen25.htm > > Pros: configurable++, Overcurrent and thermal protection. > > Cons: Kinda overkill, bit more expensive, 1 week lead time.
> > On 4 September 2011 23:04, Triffid Hunter <triffid.hun...@gmail.com> wrote:
> >> On Sun, Sep 4, 2011 at 10:34 PM, Lemming . <inert...@gmail.com> wrote: > >> > The problem we keep running into with this thing is the > >> > rather horrendous amount of current this motor seems to draw when, and > >> > that the batteries are more than happy to provide it!
> >> Any ideas exactly how much that is? DC resistance of the motor and > >> ohm's law should give a good ballpark figure.
> >> My proposal should be good up to a few hundred amps, if you use decent > >> mosfets, ie ones with low Rds(on), Vds(max) of at least 30v and a > >> package you can bolt a lot of to a heatsink without much work.
> >> I would suggest IRL3803, because I have a bunch of them and they can > >> carry 15A with /no/ heatsink and a mere 5v gate drive. With a > >> substantial heatsink (eg 2c/w), one should be able to carry over 60A.
> >> 8 of those in parallel on a big heatsink, plus a good diode or 10 to > >> catch the flyback pulse, and a reversing switch that can handle the DC > >> current (but not necessarily the switch-off arc) should solve your > >> door woes. They'll need a decent gate driver, 74hc244 perhaps with one > >> output per gate. IRL3803's downside is its high gate charge (140nC) > >> which means at 10mA gate drive, it takes about 14uS to switch.
> >> Futurlec carry IRL3803 at $0.90/ea but you may not want to wait for > >> their postage, see what else is available. Perhaps you already have > >> some suitable mosfets in the space waiting to be discovered?
> >> I don't know if jaycar and friends carry anything with a usably low > >> Rds(on) - maximum for this is about 10mR. Last time I checked, their > >> mosfet selection was less than stellar, but that was several years ago > >> now.
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