Alt-BEAM Archive
Message #00766
To: Justin jaf60@student.canterbury.ac.nz, beam@corp.sgi.com
From: dennison dennlill@buffnet.net
Date: Mon, 22 Feb 1999 10:07:51 -0500
Subject: [alt-beam] Re: reverse switch for photovore
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I suppose it can be done this way. I've been working on Bicore photovores
also, and come up with what I think is a better way to do buisness. I've
attaced the vague diagram below. It's only 7kb so it shouldn't 'clog the
wheels of capitalism' across the world.
Anyway, the idea is to use Nu's to directly opperate reversing the motors. I
came up with the idea myself, but after talking with zoz it seems like Mark
T may have used this design himself first. Se va'. I'm in the process of
building a bot like this right now, if I finish my school work that is. I'm
going on to build an entire phototropic, solarpowered, and obstacle
avoidence bot on one chip. Or maybe two, depending on the type of drivers I
use. It should be interesting.
Dennison
>As some might have noticed (and helped :), I'm working on a bicore-based
>photovore. Being the annoying guy that I am, I decided I wasn't happy
>with the reverse switch only acting for as long as it was contacting,
>and decided to make a reverse switch with a time-delay before it resets.
>Normally, a resistor-capacitor arrangement is used, but there didn't
>seem any obvious way of applying that directly to bicore sensors, so I
>did it indirectly . Below is the diagram for the most successful
>method I found. If you can think of a better way, I'd love to hear from
>you :-)
>
>I tried implementing it without a transistor, with some success, but
>there way a very noticeable influence on the bicore from the presence of
>the circuit, whereas with the transistor, there is no apparent
>difference to operation, except for the addition of the timer on the
>touch sensor.
>Obviously, a timed switch acting the other way can also be added across
>the other photo-diode.
>
>Comments? Does this look like a sensible way to do it?
>
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