Alt-BEAM Archive

Message #04334



To: beam@sgiblab.sgi.com
From: James Taylor edgar_the_hate_bug1@yahoo.com
Date: Mon, 7 Jun 1999 14:34:39 -0700 (PDT)
Subject: [alt-beam] Re: Solar Walker


I don't understand this?
The PNC thing I sorta understand
I like the unclosed microcore though, but how would it
fall into the right state without a PNC, or a few
processes to start?
Disable the 245 sounds like a good idea too,
expept, would the Microcore run all the time. How
could you coordinate the right walking pulses, with
the timed charges
The time delay PNC sounds the best, having maby a
10-20 second delay between each pulse, allowing time
for recharge. Any ideas?
Any at all?


--- Wilf Rigter wrote:
> No need for a PNC, no need to disable the 245, and
> perhaps use
> the output of the last microcore stage to reset the
> SE on the
> lagging edge.
>
> enjoy
>
> Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
> tel: (604)590-7493
> fax: (604)590-3411
>
> > -----Original Message-----
> > From: Benjamin Edward Hitchcock
> [SMTP:beh01@uow.edu.au]
> > Sent: Sunday, June 06, 1999 4:48 PM
> > To: beam@corp.sgi.com
> > Subject: 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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> >
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> >
> >
> >
> >
> > ----- End of forwarded message from James Taylor
> -----
> >
> > --
> > Nothing is foolproof to a sufficiently talented
> fool.
>

===
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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