Alt-BEAM Archive
Message #04327
To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Mon, 7 Jun 1999 07:31:12 -0700
Subject: [alt-beam] Re: Solar Walker
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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> ----- End of forwarded message from James Taylor -----
>
> --
> Nothing is foolproof to a sufficiently talented fool.
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