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From: dj@ctron.com (DJ Delorie)
Newsgroups: comp.robotics,sci.electronics
Subject: Re: Sensing a known location to reference off of
Message-ID: <1493@balrog.ctron.com>
Date: 15 May 91 13:46:53 GMT
References: <1991May15.005403.28812@src.honeywell.com>
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In article <1991May15.005403.28812@src.honeywell.com>, gcary@SRC.Honeywell.COM (Greg Cary) writes:
> 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?

@set-mode(opinion,on)

My printer uses optics.  I've seen others with switches.  If you get
one of the optical modules designed for this (the ones with the slot
in them), I'd expect them to be quite reliable and not succeptible to
mechanical wear, damage, or tolerance changes.

@set-mode(opinion,off)

DJ
dj@ctron.com
@include(disclaimers)