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From: gcary@SRC.Honeywell.COM (Greg Cary)
Subject: Sensing a known location to reference off of
Message-ID: <1991May15.005403.28812@src.honeywell.com>
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Organization: Honeywell Systems & Research Center
Date: Wed, 15 May 91 00:54:03 GMT

I am constructing a compact disc jukebox for my CD collection, and I
would very much appreciate some advice on location sensing.
What I need to do is determine when I am passing by a known location, so
that I can count off the right number of stepper motor steps so that
I end up at the right CD.  Two methods that come to my mind right away
are 1) using a microswitch, and 2) interrupting the light between an
LED emitter/detector pair.  By far the most important thing is that I
get repeatable results.

How well do these methods work?  What other methods are there?

Thanks a lot in advance,


Greg Cary
gcary@SRC.honeywell.com    office: (612)782-7683   FAX: (612)782-7438