Alt-BEAM Archive

Message #04338



To: beam@sgiblab.sgi.com
From: Dennison dennlill@buffnet.net
Date: Fri, 7 May 1999 19:17:38 -0400
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?

Just have a PNC at the Front Nueron that also disables the 245.

> Disable the 245 sounds like a good idea too,
>expept, would the Microcore run all the time.

Yes, as long as there is enough power.

How
>could you coordinate the right walking pulses, with
>the timed charges

You don't have to for a two motor walker.

> The time delay PNC sounds the best, having maby a
>10-20 second delay between each pulse, allowing time
>for recharge. Any ideas?

You'll probbaly need more than a 20 second delay.
>
Dennison


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
>_________________________________________________________
>Do You Yahoo!?
>
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