Alt-BEAM Archive

Message #04316



To: beam@corp.sgi.com (mailing list)
From: Benjamin Edward Hitchcock beh01@uow.edu.au
Date: Mon, 7 Jun 1999 09:48:01 +1000 (EST)
Subject: [alt-beam] Re: Solar Walker


There are two things I would try if I were you:

1.
Use the SE to initiate a 'pulse' around the microcore. This means tthat
your microcore isn't a closed loop, it is just an open one - the last
connection isn't made.
So when the SE fires, it starts the pulse going, the walker takes one
complete cycle (step) and then waits for more charge.

I imagine this would make the walker a bit lopsided, because one side of
its operation would have more charge (voltage) available to it. (ie the
first state of the microcore always has more voltage than the last state).
Worth trying, though.

2.
Use the SE to enable a 74XX245 driver chip. Instead of tying the enable
pin low, use a SE to pulse it low when there is enough voltage to run the
motors.
This won't reasult in lopsided operation, but some steps might be a bit
jerky, and I would guess that sometimes the one leg would rotate twice in
the one direction. I think you would need end stops for this
configuration, or springs or something along those lines.


Good Luck!

Ben

----- Forwarded message from James Taylor -----

Hello,
Need some help solarizing a walker. I read the
BEAM tech FAQ, and came up with the time delay PNC.
Only question is, do you need one of them for ever Nu?
If not where is it wired into the Micro Core?
I would aslo like to know if their is a better way
to solarize a walker, not sure, but I heard once that
someone wired the microcore to have constant power,
and the leg motors to fire off after the charge?
Anything that works is fine for me.


===
Everything I say can mean one of two things...If something I say makes you mad....I meant it the other way.

James Taylor
URL: http://fly.to/springmeadows
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----- End of forwarded message from James Taylor -----

--
Nothing is foolproof to a sufficiently talented fool.

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