Alt-BEAM Archive
Message #13337
To: beam@sgiblab.sgi.com
From: Daniel Grace lifebytes_98@yahoo.com
Date: Mon, 10 Apr 2000 17:58:41 -0700 (PDT)
Subject: Re: motor problems (nobody knows???)
Maybe your circuit isn't resetting. I normally don't
answer unless it's something I'm really in to, since I
don't know that much, but you're right, it's been a
while since you got an answer, and it seems like the
right one is too much current from your solar cell.
~Daniel
--- Aaron Letts wrote:
> Nobonby knows this? I asked my dad and he said it
> may
> have something to to with the motors being AC not
> DC.
> Can anyone confirm that this is the reason why this
> is
> happening? And what I an do to solve it?
>
>
> Aaron
>
>
>
> --- Aaron Letts wrote:
> > I just got 2 VCRs from the dump and I tore them
> > apart.
> > I got 3 motors from each. So, I made a simple
> > solarengine to put on one of the ones that I
> thought
> > was good, just to give it a try. After I was done
> > when
> > I was testing it, I ran into some problems. I
> would
> > put it under the lamp, then it would go like it
> was
> > suppose to, but it wouldn't trigger again, and it
> > would make a high pitched sound. After I took it
> out
> > of the light, then put it back in agian, it would
> > go,
> > but only once. It would never go twice, I had to
> > take
> > it out of the light, then put it back in. Why does
> > it
> > do this, and what can I do to fix it?... if there
> is
> > anything at all.
> >
> > Thanks,
> >
> >
> >
> > Aaron
> >
> >
>
_______________________________________________________
> > Do You Yahoo!?
> > Get your free @yahoo.ca address at
> > http://mail.yahoo.ca
> >
>
>
_______________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.ca address at
> http://mail.yahoo.ca
>
=====
ICQ # 39402143
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13338 Tue, 11 Apr 2000 10:53:26 +1000 (EST) Re: m/s bicore walker beam@sgiblab.sgi.com Ben Hitchcock It doesn't really matter what value you use. I have a heap of 0.22 uF
caps in my BEAM parts box, so I use those.
0.01 should work equally as well at smoothing out those nasty power supply
ripples. I wouldn't go lower than 0.001 or so though.
Ben
> It's a m/s bicore.
>
> I thought it should be just .01uF. Was I mistaken?
>
> -phillip
>
> ----- Original Message -----
> From: Ben Hitchcock
> To:
> Sent: Monday, April 10, 2000 5:46 PM
> Subject: Re: m/s bicore walker
>
>
> > You could try a 0.01 or 0.022 uF cap - something across the motor
> > terminals with about that sort of value should do the job.
> >
> > You _did_ put a 0.22 uF cap across the power pins on your microcore didn't
> > you?
> >
> > Ben
>
--
Nothing is foolproof to a sufficiently talented fool.
13339 Mon, 10 Apr 2000 21:13:23 EDT Re: sumop beam@sgiblab.sgi.com BUDSCOTT@aol.com In a message dated 4/10/00 8:08:14 PM Central Daylight Time,
rambaud@worldnet.att.net writes:
<< I was thinking about including a circuit that would send a shock through
its
frame to protect itself from other bots, siblings, children, and animals.
by the way these discussions of sumo bots are going its going to end up like
this http://www.robotwars.co.uk/
>>
I saw that show the other day on WTTW in chicago, it was 'interesting'. They
weren't really real bots, just RC chainsaws, but just imagine what a huge
beam walker with big 'ol 24VDC surplus style motors and circular saw on the
bottom to cut open the tops of other robots, well, thats what i thought of
when i saw the show.
Silly me, my mind doesn't think in straight lines!
-Spencer
<http://www.botic.com/users/beamstop>
not a robot scientist
not a college major
not a grad student
not a professor
not a very organized person
just Spencer (isn't that impressive enough?)
13340 Mon, 10 Apr 2000 18:17:35 -0700 RE: motor problems (nobody knows???) "'beam@sgiblab.sgi.com'" Wilf Rigter The squeal means your SE is oscillating and not resetting properly. The VCR
motors are usually DC +5 or +12V type and not very efficient. It is probably
simpler to get a couple of motors from small battery operated appliances
(CD/walkman) since they are lower voltage and generally more efficient.
Otherwise you will have to tweak the SE components to match the motor specs
and learn a lot about SEs in the process.
wilf
> -----Original Message-----
> From: Aaron Letts [SMTP:beamlist@yahoo.ca]
> Sent: Monday, April 10, 2000 4:33 PM
> To: beam@sgiblab.sgi.com
> Subject: Re: motor problems (nobody knows???)
>
> Nobonby knows this? I asked my dad and he said it may
> have something to to with the motors being AC not DC.
> Can anyone confirm that this is the reason why this is
> happening? And what I an do to solve it?
>
>
> Aaron
>
>
>
> --- Aaron Letts wrote:
> > I just got 2 VCRs from the dump and I tore them
> > apart.
> > I got 3 motors from each. So, I made a simple
> > solarengine to put on one of the ones that I thought
> > was good, just to give it a try. After I was done
> > when
> > I was testing it, I ran into some problems. I would
> > put it under the lamp, then it would go like it was
> > suppose to, but it wouldn't trigger again, and it
> > would make a high pitched sound. After I took it out
> > of the light, then put it back in agian, it would
> > go,
> > but only once. It would never go twice, I had to
> > take
> > it out of the light, then put it back in. Why does
> > it
> > do this, and what can I do to fix it?... if there is
> > anything at all.
> >
> > Thanks,
> >
> >
> >
> > Aaron
> >
> >
> _______________________________________________________
> > Do You Yahoo!?
> > Get your free @yahoo.ca address at
> > http://mail.yahoo.ca
> >
>
> _______________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.ca address at http://mail.yahoo.ca
13341 Mon, 10 Apr 2000 18:09:24 -0700 RE: Walker "hanging" gait problems "'beam@sgiblab.sgi.com'" Wilf Rigter Hi Bernie,
Need more data! What circuit are you using? What component values? Freeze =
one led stays on?
Only the power supply, ground and motor driver output traces should be
"fat" but in general leave as much copper on the PCB (ground plane) as
possible since in any case that takes less etchant.
wilf
> -----Original Message-----
> From: Bernard Nazari [SMTP:Bernard.Nazari@jpl.nasa.gov]
> Sent: Monday, April 10, 2000 5:11 PM
> To: beam@sgiblab.sgi.com
> Subject: Walker "hanging" gait problems
>
> Hi All,
> Well, I'm still in the midst of making my three motor walker and
> I've come
> across a problem with the PCB that I didn't have on the proto board. I
> made
> the PCB at home, so that MIGHT be the problem. The problem is that once in
>
> a while, the sequence freezes on a LED. (I'm using LEDs right now and I
> don't have the H-bridge/motors hooked up yet.) I was thinking that the cap
>
> on it is not getting drained and that's why is freezes. I have checked and
>
> rechecked for flux about a thousand times, so that's not the issue, and
> neither are bad batteries. The only other thing I thought of was that the
> traces ended up too thin when I etched the board and not enough current is
>
> passing through to discharge the cap. FYI, I'm using a photo resist
> positive style process from MG Chemicals. How thick do these traces need
> to
> be? Anyway, I'm going to go get some components and try to make another
> board later. Take care!
> Bernie N.
> --------------------------------------------------------------------------
> --
> --------------------
> DISCLAIMER: JPL now requires notice in all electronic communication
> that all personal and professional opinions presented herein are my
> own and do not, in any way, represent the opinion or policy of JPL.
13342 Mon, 10 Apr 2000 22:45:52 -0400 (EDT) RE: motor problems (nobody knows???) beam@sgiblab.sgi.com Aaron Letts
> Otherwise you will have to tweak the SE components
> to match the motor specs and learn a lot about SEs
> in the process.
Wilf:
Where can I go to find info that would help me on
this?
Thanks again,
Aaron
> > -----Original Message-----
> > From: Aaron Letts [SMTP:beamlist@yahoo.ca]
> > Sent: Monday, April 10, 2000 4:33 PM
> > To: beam@sgiblab.sgi.com
> > Subject: Re: motor problems (nobody knows???)
> >
> > Nobonby knows this? I asked my dad and he said it
> may
> > have something to to with the motors being AC not
> DC.
> > Can anyone confirm that this is the reason why
> this is
> > happening? And what I an do to solve it?
> >
> >
> > Aaron
> >
> >
> >
> > --- Aaron Letts wrote:
> > > I just got 2 VCRs from the dump and I tore them
> > > apart.
> > > I got 3 motors from each. So, I made a simple
> > > solarengine to put on one of the ones that I
> thought
> > > was good, just to give it a try. After I was
> done
> > > when
> > > I was testing it, I ran into some problems. I
> would
> > > put it under the lamp, then it would go like it
> was
> > > suppose to, but it wouldn't trigger again, and
> it
> > > would make a high pitched sound. After I took it
> out
> > > of the light, then put it back in agian, it
> would
> > > go,
> > > but only once. It would never go twice, I had to
> > > take
> > > it out of the light, then put it back in. Why
> does
> > > it
> > > do this, and what can I do to fix it?... if
> there is
> > > anything at all.
> > >
> > > Thanks,
> > >
> > >
> > >
> > > Aaron
> > >
> > >
> >
>
_______________________________________________________
> > > Do You Yahoo!?
> > > Get your free @yahoo.ca address at
> > > http://mail.yahoo.ca
> > >
> >
> >
>
_______________________________________________________
> > Do You Yahoo!?
> > Get your free @yahoo.ca address at
> http://mail.yahoo.ca
>
_______________________________________________________
Do You Yahoo!?
Get your free @yahoo.ca address at http://mail.yahoo.ca
13343 Mon, 10 Apr 2000 22:43:32 -0400 (EDT) Re: motor problems (nobody knows???) beam@sgiblab.sgi.com Aaron Letts I had the circuit working on a motor from a tape
player, so I know tht isnt the problem.
--- Daniel Grace wrote:
> Maybe your circuit isn't resetting. I normally don't
> answer unless it's something I'm really in to, since
> I
> don't know that much, but you're right, it's been a
> while since you got an answer, and it seems like the
> right one is too much current from your solar cell.
>
> ~Daniel
>
> --- Aaron Letts wrote:
> > Nobonby knows this? I asked my dad and he said it
> > may
> > have something to to with the motors being AC not
> > DC.
> > Can anyone confirm that this is the reason why
> this
> > is
> > happening? And what I an do to solve it?
> >
> >
> > Aaron
> >
> >
> >
> > --- Aaron Letts wrote:
> > > I just got 2 VCRs from the dump and I tore them
> > > apart.
> > > I got 3 motors from each. So, I made a simple
> > > solarengine to put on one of the ones that I
> > thought
> > > was good, just to give it a try. After I was
> done
> > > when
> > > I was testing it, I ran into some problems. I
> > would
> > > put it under the lamp, then it would go like it
> > was
> > > suppose to, but it wouldn't trigger again, and
> it
> > > would make a high pitched sound. After I took it
> > out
> > > of the light, then put it back in agian, it
> would
> > > go,
> > > but only once. It would never go twice, I had to
> > > take
> > > it out of the light, then put it back in. Why
> does
> > > it
> > > do this, and what can I do to fix it?... if
> there
> > is
> > > anything at all.
> > >
> > > Thanks,
> > >
> > >
> > >
> > > Aaron
> > >
> > >
> >
>
_______________________________________________________
> > > Do You Yahoo!?
> > > Get your free @yahoo.ca address at
> > > http://mail.yahoo.ca
> > >
> >
> >
>
_______________________________________________________
> > Do You Yahoo!?
> > Get your free @yahoo.ca address at
> > http://mail.yahoo.ca
> >
>
> =====
> ICQ # 39402143
>
> __________________________________________________
> Do You Yahoo!?
> Talk to your friends online with Yahoo! Messenger.
> http://im.yahoo.com
>
_______________________________________________________
Do You Yahoo!?
Get your free @yahoo.ca address at http://mail.yahoo.ca
13344 Mon, 10 Apr 2000 19:33:47 -0700 RE: Walker "hanging" gait problems beam@sgiblab.sgi.com Bernard Nazari Hi Wilf,
I'm using a 6 neuron microcore. Its basically the three motor
Chiu-style walker. I'm also using Bruce's PNC to get the whole thing
started. The sequence stops on one LED (010000) and it doesn't
continue...or it pops into a 010100 and stays stuck on that. I checked the
resistors that ground on that section and solder joints are clean. As for
the traces, I'm using 2mm traces to power up the h-bridges (which are
stashed away in the servo casing after I took out the previous guts). The
rest of the traces are 20 mils. I think the problem might be that I have
some hairline crack in the trace somewhere under the 74hc14 and I can't see
it. (I'm using a double sided PCB). I'm going to redo the whole thing again
tonight and hopefully it will work then. Anyway, take care and thanks for
the help!
Bernie
At 06:09 PM 4/10/00 -0700, you wrote:
>Hi Bernie,
>
>Need more data! What circuit are you using? What component values? Freeze =
>one led stays on?
>
>Only the power supply, ground and motor driver output traces should be
>"fat" but in general leave as much copper on the PCB (ground plane) as
>possible since in any case that takes less etchant.
>
>wilf
----------------------------------------------------------------------------
--------------------
DISCLAIMER: JPL now requires notice in all electronic communication
that all personal and professional opinions presented herein are my
own and do not, in any way, represent the opinion or policy of JPL.
13345 Tue, 11 Apr 2000 12:53:40 +1000 Re: WCRG? (plus info on WCRG events) "CORBIT GIBERSON"
> Sounds very cool, Could we get the web address??
>
> David Perry wrote:
> >
> > but that was alot of hydrogen, i've seen a little project on the
internet
> > for a hydrogen powered water pistol that used electrodes to seperate the
> > hydrogen, which was ignited, blasting the water a good distance (save
that
> > one for muck up day muhahaha)
> >
> > David
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