how do we keep the ard-bot from falling off the table?
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Homan Chou
Apr 8, 2012, 1:39:32 PM4/8/12
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Is there a sensor that can detect the edge of a table so as to prevent the ard-bot from driving off a cliff, so to speak?
Homan
P.S., Michael, I was able to get rid of the shrill squeak in my gear box by completely rebuilding it and swapping some parts between the right and left side. Still a mystery to me, but it's quiet now.
Gene Dahilig
Apr 8, 2012, 2:38:47 PM4/8/12
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Jasmine has the same problem even after rebuilding. But the squeal went away after she oiled up the gears a little bit.
mlbelanger
Apr 8, 2012, 10:31:18 PM4/8/12
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Hey Homan,
You could try something like this:
http://www.sparkfun.com/products/9453
It's a reflectance sensor with analog output. You'd need to try it on
the bottom of the bot somewhere (maybe the flat spot on the motor
gearbox) and see what values it gets on a table vs looking over the
edge. With several of these you could also do line following, but at
$3 each these individual modules might not be the best way to go for
that.
Glad the gearbox is running quietly now!
M.
You could try something like this:
http://www.sparkfun.com/products/9453
It's a reflectance sensor with analog output. You'd need to try it on
the bottom of the bot somewhere (maybe the flat spot on the motor
gearbox) and see what values it gets on a table vs looking over the
edge. With several of these you could also do line following, but at
$3 each these individual modules might not be the best way to go for
that.
Glad the gearbox is running quietly now!
M.
mlbelanger
Apr 8, 2012, 10:40:24 PM4/8/12
to LA Robotics Club
Hey Gene,
That's awesome. Squeaky gears get the grease...
M.
On Apr 8, 11:38 am, Gene Dahilig <g...@dahilig.com> wrote:
> Jasmine has the same problem even after rebuilding. But the squeal went away after she oiled up the gears a little bit.
>
> --
> Gene Dahilig
> Sent with Sparrow (http://www.sparrowmailapp.com/?sig)
That's awesome. Squeaky gears get the grease...
M.
On Apr 8, 11:38 am, Gene Dahilig <g...@dahilig.com> wrote:
> Jasmine has the same problem even after rebuilding. But the squeal went away after she oiled up the gears a little bit.
>
> --
> Gene Dahilig
Tim Laren
Apr 15, 2012, 5:10:30 PM4/15/12
to larobot...@googlegroups.com
Don't know if you got an sensor or not, but I have the TCRT5000 sensor and can bring them to the next Meetup. It is an IR Emitter and Detector in one unit. The ones I have are not on a board and cost $1. Currently I only have a few in stock but have a few hundred coming in any day now. I did a little writeup on it in my forum: http://hacker.instanet.net/forums/viewtopic.php?f=6&t=32. If you want one or two, let me know and I will save them for you. Also anyone that purchased the kit #3 from me, there are two in the kit.
Tim
PS: Anyone have any suggestions on what type of grease to use. The tube that came with mine seemed to have about 1 drip in it and that didn't do it for me. Mine still can be heard around the world.
Tim
PS: Anyone have any suggestions on what type of grease to use. The tube that came with mine seemed to have about 1 drip in it and that didn't do it for me. Mine still can be heard around the world.
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