Alt-BEAM Archive
Message #11178
To: beam@sgiblab.sgi.com
From: Ben Hitchcock beh01@uow.edu.au
Date: Wed, 1 Mar 2000 15:50:22 +1100 (EST)
Subject: [alt-beam] Re: mini walker
Oh just one more thing,
supply the +V pin on the 1381 from the last neuron in the chain. That way
if the sun is
REALLY bright the process keeps going around and around the loop while
there's voltage available, rather than going through once and stopping.
Ben
> Here's an idea:
>
> You don't need a SE!
> Just attach the 1381 to power and ground, andconnect the output of the
> 1381 to the input of the microcore via a normal microcore cap. The 1381
> gets to its switch-on voltage, introduces a process, and bang off it goes.
> No need to enable or disable the 240. And have the process fall of f the
> end of the core - four neurons in a chain. This means that you get to
> gang two gates together per coil lead - two gates ganged up would give you
> enough juice to drive the walker, methinks. And the nice thing about this
> is that you only need one chip, one 1381, four caps and resistors, plus
> your coils and solar panel and storage cap and that's it!
>
> Too easy.
>
> Ben
>
> > I was thinking about using a microcore instead of a master slave bicore.
> > Either way, can pulses be stopped and resumed from their last position?
> > I'm wondering if an Nv chain that is initiated by the SE firing would
> > work. Switch the source to a different coil and polarity on each of 4
> > steps, and then fall off the end. Allow the SE to charge to full. It'd
> > store enough power for a complete step cycle. If there were enough
> > power, I assume the SE could continuously fire the start of the Nv
> > chain, till light levels drop and it would then rely on firing
> > intermittently, till it looses it's charge again.
> >
> > Has anyone made such a circuit before???
> >
> > Would the Chloroplast be suitable for this purpose, and how can I get a
> > single pulse out of it, with a second sustained pulse going to the
> > driver (I suppose 2 chips would be acceptable, if necessary). If the
> > driver powers the coils, then would it be possible to attach it to the
> > steady voltage output of the Chloroplast SE and the pulse to the
> > trigger, and have a very high dropout level, so it shuts down right
> > away, waiting for the next charge before refiring???
> >
> >
> > Ben Hitchcock wrote:
> > >
> > > Hi,
> > >
> > > > What
> > > > would be best? I thought of an SE type system with a timed trigger. Is
> > > > there a way to create an SE that triggers different pulse outputs in
> > > > chain? I'll play with circuits. That's what we're here for anyway. New designs!
> > >
> > > How about using a shift register? Attach the SE to an enable pin on your
> > > motor driver (74xx240) and also to the clock pin on the shift register.
> > > You'll also need to attach the fourth (or is it fifth?) pin of the shift
> > > register to the data in
> > > pin, and somehow start a pulse when there aren't any in the stream...
> > > you'd need four diodes (one from each gate on the shift register) a
> > > resistor and an inverter to create a pulse if none existed in the chain.
> > >
> > > Maybe a shift register isn't such a good idea after all... 2 IC's instead
> > > of one... Perhaps ye olde microcore could be adapted to do it.
> > >
> > > Good luck!
> > >
> > > Hmm maybe the bot won't be able to steer using this setup. no matter, it
> > > will look pretty cool.
> > >
> > > Ben
> >
> > --
> >
> >
> > Richard Piotter The Richfiles Robotics & TI web page:
> > richfile@rconnect.com http://richfiles.calc.org
> >
> > -- Make Money by Simply Surfing the Net or responding to E-Mail!!!
> > -- Click below!!!
> >
> > http://www.alladvantage.com/go.asp?refid=ATL147
> > http://www.spedia.net/cgi-bin/dir/tz.cgi?run=show_svc&fl=8&vid=329630
> >
>
>
> --
> Nothing is foolproof to a sufficiently talented fool.
>
--
Nothing is foolproof to a sufficiently talented fool.
11179 Wed, 1 Mar 2000 16:08:03 +1100 Unicore
> are there any unicore schematics on the web, i'm really interested in
making
> a beamant, just can't find stuff for it! anybody?
>
> -Spencer
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