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[DPRG] mouse guts

Subject: [DPRG] mouse guts
From: W.E.Cole wecole at ev1.net
Date: Sun Feb 6 22:44:03 CST 2005

Hmmm... interesting. All of the mice I've torn apart (and granted, it's only
been 4-5) had only one detector pair per encoder. One set (encoder, emitter,
detector) reads the x axis, the other set reads the y-axis. (To be honest, I
thought that was how all of the mechanical mice did it.)

I'm curious - why do some of them use two sets to read each axis?


----- Original Message ----- 
From: "Ed Okerson" <ed at okerson.com>
To: "DPRG List" <dprglist at dprg.org>
Sent: Sunday, February 06, 2005 8:53 PM
Subject: [DPRG] mouse guts

> I was looking around at all the motors I have, and thought it would be
> nice if I could make some cheap encoders for them.  I then realized that I
> have several old computer mice laying around and remembered seeing this
> site on hacking mice to get the encoders:
> http://www.boondog.com/%5Ctutorials%5Cmouse%5CmouseHack.htm
> Great article, but on taking apart several mice I found a problem.  The
> one shown in the article has two LED's and detectors per encoder wheel,
> but all of mine appear to only have one LED and detector per encoder
> wheel.  So how does the mouse get quadrature or direction out of that?
> Ed
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