Alt-BEAM Archive
Message #01580
To: Hans Tolboom h.tolboom@stud.tue.nl, beam@corp.sgi.com
From: Brian beamguy@yahoo.com
Date: Wed, 17 Mar 1999 15:07:19 -0800 (PST)
Subject: [alt-beam] Re: Why use a 4 / 6 Nv MicroCore in a walker ? (Newbie)
The Nv structure is nice because you can very easily adjust the time
constant and it can be influenced in many ways to get different
behaviors/gaits.
---Hans Tolboom wrote:
>
> Hello,
>
> I'm a bit new in the BEAM principle and I'm trying to figure
> out the MicroCore. As a starting point I've use the site of
> Andrew Miller, 'How to make a walker'.
>
> To explain it he used a 6 Nv microcore circuit like this :
> ---
> 1 -| |- 4
> 2 -| |- 5
> 3 -| |- 6
> ---
>
> The MicroCore has 4 states :
>
> 1 - saturated state
> 2 - Two process state
> 3 - Single process state
> '1' does 1->2->3->4->5->6->1-> etc.
> the rest is '0'
> 4 - Null state
>
> For a two-motor walker all you need is a circuit with 4 Nv's.
> To walk the Microcore has to be in the single process state.
>
> To me this behaviour looks a lot like the behaviour of a 4
> bit shift register like a 74hc194 (up/down shift). If you
> you change the wiring to
> 1 = Qa 3 = Qb
> 2 = Qc 4 = Qd,
> the walker will walk in the same way as with a 4 Nv net.
> The only difference between a 4 Nv and a 4 bit shift is that
> the 74hc245 can provide itself with a puls-generator and the
> 4 bit shift needs an external (NE555 ?) controlled puls-
> generator.
>
> Can anyone explain to me what the real advantage of a nervous
> net (used for a walker with 2 or 3 motors) is compared to
> something like a 4 (or 8) bit shift reg. ??
>
>
>
> thanks, Hans
>
>
>
>
==
Brian
beamboter@iname.com
www.welcome.to/briansbeam
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