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Thread: Magnetic or photoeye encoder?

  1. #1

    Default Magnetic or photoeye encoder?

    Does anyone know of a good encoder that reads off a spinning magnet like on a bicycle?·
    I also wanted to know if a photoeye placed very close to a spinning disc·with holes in it could work as a crude encoder.· A bright LED could be placed on the other side to help distiguish light from dark.· I dont know how photoeyes work, and was wondering if·they would lag at high speeds and not get good readings or not.
    Last edited by ForumTools; 10-03-2010 at 12:39 AM. Reason: Forum Migration

  2. #2

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    You could use a Hall-effect sensor with a magnet, and a photo-transistor with your LED scheme. If using the BASIC Stamp, the COUNT instruction can be used to determin wheel speed.

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    Jon Williams
    Applications Engineer, Parallax
    Dallas Office
    Last edited by ForumTools; 10-03-2010 at 12:39 AM. Reason: Forum Migration

  3. #3

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    I found it... very small, lightweight, and only $10:

    http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFVF5&P=7
    Last edited by ForumTools; 10-03-2010 at 12:39 AM. Reason: Forum Migration

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