Alt-BEAM Archive

Message #00901



To: beam@corp.sgi.com
From: Justin jaf60@student.canterbury.ac.nz
Date: Wed, 24 Feb 1999 18:45:49 +1300
Subject: [alt-beam] Re: Reversing Photopopper- one more question


> Just a follow-up question. I have always built photovores following
> the basic circuit used in a Solarbotics Photopopper. What are the
> advantages of the bicore design and where can I find details on how to
> build one step-by-step?
> Also can you not ad reversibility to a 1381 style photopopper?

To my mind, the reversability of a bicore-driven photovore is it's main
advantage. You can add reversability to a normal photopopper, but I
suspect you'll end up adding a fair volume of components (probably a
74HC240, and either two motor driving IC's, or two H-bridges (about 8
components each), at which point the full circuit is probably taking
more volume than a bicore photovore anyway.

As to step by step details; none are up that I know of yet. I'm working
on one, which I'll put up on the web when it's done, but I still have
some over-ambitious plans for the body construction, so don't expect
anything from me anytime soon :-)
I posted a schematic a while back that works, but it's not a great
design (sucks about 200uA). You can probably expect me to put up a
better one within the next week or so.

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