As far as I know one end moves 36mm, but what happens with the other end.
May be it can have some kind of bar and pivot to amplify (mechanically) its
movement.

Rodolfo

-----Mensaje original-----
De: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] En nombre de
RussellMc
Enviado el: Jueves, 30 de Diciembre de 2010 10:41 a.m.
Para: Microcontroller discussion list - Public.
Asunto: Re: [EE] Cheap, thin, 36mm linear encoder with one+ million cycles

> Gray code encoders, if cheap enough, usually are rotary (I never saw one
linear
> at least). Pretty expensive anyway.

Gray code encoder can be optical or use other sensors
Gray code can be a SINGLE track with multiple sensors spaced along it
in such a way that they between them "see" a gray code. Mathematicians
used to say it was impossible. Nowadays its done. I don't know how
hard it is to get 6 or 7 bits.
BUT if you can use and end of track detector then you need simply two
detectors in quadrature on a single track. Very standard. cf eg
mechanical wheeled mouse. Each axis ha one "track" and two sensors.

36mm / 6 bits is about 0.5 mm/bit. Somewhat fine.

An optical "window" with width affected by position would probably be
easy enough. read light level shining through "window" to get
position.


     Russell



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