Alt-BEAM Archive
Message #02815
To: beam@corp.sgi.com
From: Steven Bolt sbolt@xs4all.nl
Date: Fri, 30 Apr 1999 19:28:31 +0200 (CEST)
Subject: [alt-beam] Smiley
While waiting for the Suneater_V PCBs to arrive, I had time to
finish an older project. Meet Smiley.
His behaviour is based on three rules:
1. If no feeler switches are closed, the motors will obey the `eyes'.
Smiley moves towards the best light, while trying to avoid shadow
patches.
2. If one of the feelers touches an obstacle, Smiley "follows the wall" in
the direction of the better light. Both this and the first behaviour
are illustrated here.
3. With both feeler switches closed, the robot will push against one of
them, trying to get free.
My other solar-powered `bots show exactly the same behaviour. But
Smiley is the first to manage with just one 74HC14 and one transistor
as `brain'. Inspiration was provided by Wilf's talk of pulse-width
modulation, two months ago. Pictures, schematic, PCB layout and all
other details on:
http://www.xs4all.nl/~sbolt/e-smiley.html
Enjoy,
Steve
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# sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
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