Not allowed to post a reply

[Slamer Team K.I.S.S.]

Hi My Name is Steven Nelson.

How do you reply to a message in this group? None of the 4 test posts
I have tried have appeared even after a few days. I might have some
things to contribute I have built lots of robots. Is this a closed
group?

www.teamkiss.com

[Wayne C. Gramlich]

Steven:

I do not know what happened, I am one of the list moderators
and I did not see anything until the message below. Everybody
is on moderation up until after their 1st post is approved (we
catch 99% of the list spammers that way.)

Welcome aboard,

-Wayne

> --
>
> You received this message because you are subscribed to the Google Groups "HomeBrew Robotics Club" group.
> To post to this group, send email to hbrob...@googlegroups.com.
> To unsubscribe from this group, send email to hbrobotics+...@googlegroups.com.
> For more options, visit this group at http://groups.google.com/group/hbrobotics?hl=.
>
>
>

[Russell Newcomb]

Not sure if this is helpful. I also subscribe to HBRobotics and got this message but none of your test messages. It did land in my spam inbox though (about 10% or 20% of the HBR posts land in spam I do not know why).

Russ

--- On Sun, 11/22/09, Slamer Team K.I.S.S. <teamki...@gmail.com> wrote:

[Wayne C. Gramlich]

Russ:

Spam filtering is not a function of Google Groups software;
that occurs after it hits your mailbox.

In my particular case, all my E-mail gets immediately
forwarded to a G-mail account where it gets filtered
for spam. I specific filters to detect all messages with
HBRobotics is the subject field and keep them from being
marked as spam.

-Wayne

Russell Newcomb wrote:
> Not sure if this is helpful. I also subscribe to HBRobotics and
> got this message but none of your test messages. It did land in
> my spam inbox though (about 10% or 20% of the HBR posts land in
> spam I do not know why).
>
> Russ

[snippage]

[Alan Marconett]

I think Yahoo groups might have some spam filtering.

Alan KM6VV

[Alan Marconett]

Do I remember someone in the club using the Nubotics wheel watchers?

http://nubotics.com/products/ww01/index.html


Or maybe even being Nubotics and making them?

I'm thinking of putting them on a Mark III I'm playing with.

Alan KM6VV

[Randy M. Dumse]

Alan Marconett said: Tuesday, November 24, 2009 1:26 PM

> Do I remember someone in the club using the Nubotics wheel
watchers?

I have used them, personally and in my classes.

Pete Skeggs makes them, iirc. He's in Portland, and on the PARTS
list most often.

Randy

[Alan Marconett]

Thanks Randy,

I just went to Nubotics and saw the name. Thought I'd recognized it, but
couldn't remember where.

Alan KM6VV

[Randy M. Dumse]

Alan Marconett said: Tuesday, November 24, 2009 2:01 PM

> I just went to Nubotics and saw the name. Thought I'd
> recognized it, but couldn't remember where.

What was it you were wanting to know about them? I've had very
good luck with them used as a basis for odometry. I use the raw
output of the sensors for quadrature, and do not bother with the
LS7084 step and direction circuitry.

Randy

[Alan Marconett]

They look like a good solution to odometry on a Mark III or similar 'bot
with R/C servo drives.

I've just been reading the source code for the velocity and position control
example for the Mark III. Nice piece of code! It is however written in CCS
'C', so there are a few special library calls to set up the hardware. I
have a very old CCS compiler, perhaps I can get it compiled. I really want
to work out the hardware settings that are needed by these calls so that I
can compile and work with my Hi-Tech compilers.

Initially I was just wanting wheel counts (odometry), which I had hoped to
quickly drop into an AtomBasic (or Pro) program, but running interrupt
driven PWM may not be that easy. Using a Basic would make it easier for
others to use and duplicate.

What are you using for reading the quadrature (processor/board) and
controlling your motors (R/C?)?

Alan KM6VV

> -----Original Message-----
> From: Randy M. Dumse [mailto:r...@newmicros.com]
>

[Randy M. Dumse]

Alan Marconett said: Tuesday, November 24, 2009 2:40 PM

> What are you using for reading the quadrature
> (processor/board) and controlling your motors (R/C?)?

We run the quadrature output straight into our PlugaPod(TM)
boards, which are the CPU's I use to teach in my university
robotics courses. Most of our MiniSumo's are just RC Servo and
don't need odometry to get around the ring. But in the advanced
course, we use the wheelwatchers to show how we can capture and
plot odometry to show how the computer can figure where the
robot body is on a short test run pushing the robot by hand.
(That works surprizingly well.)

Also we have some advanced students playing with non-standard RC
motors and DC motors. Then we used the Wheel Watchers to gather
velocity results, to compare how the new motors to the standard
RC Servos. Problem there is getting a good mount to the existing
wheel. One student got replacement RC Servos, which had
different spines. He attempted to machine a new head on a wheel,
but it wobbled too much to make reliable optical "contact", so
the results were unreliable.

Randy

[Alan Marconett]

The LS7084 Quadrature clock chip could minimize the work a little. Or maybe
I should just overload the servo board I was working on, and use the
built-in dual quadrature decoders (dsPIC33). The PID (PI) controller would
be used in either design. Maybe a change in encoder resolution.

Your full-blown Motorola DSP 5680 would be interesting to use! I thought I
was going to get away with BM Basic on an '877, but that's not happening.

Alan KM6VV



> -----Original Message-----
> From: Randy M. Dumse [mailto:r...@newmicros.com]
>

[Nathaniel Lewis]

I've never used them, but I have seen other in AHRC use them and love them.
They also sell a dedicated motion controller to offload motion tracking from
the master processor. http://nubotics.com/products/wc132/index.html
Nathaniel

--

You received this message because you are subscribed to the Google Groups
"HomeBrew Robotics Club" group.
To post to this group, send email to hbrob...@googlegroups.com.
To unsubscribe from this group, send email to
hbrobotics+...@googlegroups.com.
For more options, visit this group at

http://groups.google.com/group/hbrobotics?hl=en.

[Alan Marconett]

I saw the motion controller, it was interesting as well! But I'm trying to
stay on track...

I've ordered a pair of the R/C servo motor encoders, so I'll be playing with
them.

Thanks!

Alan