Alt-BEAM Archive
Message #09922
To: Beam Mailing List beam@sgiblab.sgi.com
From: Elmo elmo@ilid.com.au
Date: Wed, 09 Feb 2000 14:37:32 +1100
Subject: [alt-beam] The Problems In My Head?
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Greetings and salivations everyone.
I have returned to my PSH project (Power Smart Head for those who have
just tuned in), after much cursing and swearing at it last year.
I am looking for some advice on whats going wrong. I have attached
several images of my oscilloscopes output and the circuit i am using.
The Problem In Brief:
When the oscillator stage reaches a point at which it is DC enough to
run the motor all i get is noise in the oscillator and no motor
movement.
The Details:
Without any optical front end attached (which basically is pulling the
input to the oscillator stage toward either Vcc or Ground), i can get a
nice 10Hz symetrical square wave. If i then try to connect the input to
either Vcc or ground to simulate a full rail swing in the front end, my
oscillator stage goes into a noisy state and i get no motor movement
becuase of it. I have a 10Hz oscillation stage with a 5Hz power smart
filter stage behind that, plus i have used all the left over inverters
in my 74HC240 chip in parellel as an extra current kick for the motor,
which is a small pager motor at present. I got a 0.22uf Cap across the
motor to get rid of extra noise and i have done Wilfs trick with the
filter stage of putting the resistor between the two caps in the circuit
to break any HF (high frequency) noise paths. I have tried a 74HCT240
and a 74ACT240 as well but i get the same results.
Any ideas or suggestions in the BEAM collective?
Elmo
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Attachment: 10Hz.jpg
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Attachment: Vcc.jpg
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Attachment: HeeedCircuit.jpg
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Attachment: Grounded.jpg
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9923 8 Feb 2000 19:55:09 -0800 [alt-beam] bicore photovores beam@sgiblab.sgi.com iphotope@canada.com Hi it's me again!
I have had this site in my files for a long time and it should
have a bicore photovore which (supposedly) spins both
motors at the same time.
http://www.geocities.com/soho/lofts/1121/beam/
Iphotope
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9924 Tue, 8 Feb 2000 18:25:24 -0800 (PST) [alt-beam] Re: Snake robots beam@sgiblab.sgi.com "Leonardo Boulton F." Try this: http://www3.sympatico.ca/rfws/bwi/
Not sure.....
--- BUDSCOTT@aol.com wrote:
> does anybody have a good tutorial on how to make a snake robot? and
> also i
> was wondering just how expensive how comlex and how many motors does
> it take?
> Any replies are welcome, even if you just have a small insignifigant
> fact
> about these bots
> thanks very much!
>
=====
I'm here... http://geocities.com/l.boulton
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9925 Tue, 8 Feb 2000 23:11:33 EST [alt-beam] RoachBot photovore beam@sgiblab.sgi.com BUDSCOTT@aol.com Check out my new photovore, it's the typical circut with the tacticle
sensors, these pictures could be useful to anybody who wants to know how to
add on the tact. sensors. Happy Beaming
-Spencer[Unable to display image]
P.S. digital cameras rock!
9926 Tue, 08 Feb 2000 20:52:55 PST [alt-beam] Re: Tutorial alt-beam@egroups.com "Jonathan Smolders" Hi,
PLEASE, make a tutorial for a head or a walker. Personally, I would like a
head tutorial, but I could use a walker tutorial as well. Yes, it might be a
lot of work, but it would be something that nobody has (well, at least the
only user friendly tutorial) and it would be giving Beam robotics a lot
more.
Just my two cents worth,
Jonathan Smolders
beamrobotics@hotmail.com
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