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rotary encoder or an incremental encoder sensor

Discussion in 'Electronic Design' started by Todd, Oct 22, 2006.

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  1. Todd

    Todd Guest

    I'm looking for make a rotary encoder or an incremental encoder. I
    bought a IR transmitter receiver from sparkfundotcom.

    I was hoping to use it to detect black and white transitions on a black
    and white vinyl decal. But it really didnt work. The problem is that
    the lines are pretty small. They are about .070 wide/thick. .070"
    black line, .070" white line, .070" black line, etc. I was thinking of
    getting the the QRB1134 phototransistor detector kit but it has to be
    at least .250 inches wide/thick.

    It is found here.
    http://www.superdroidrobots.com/product_info/QRB113x.pdf

    I have to get something that can see smaller lines. The transition
    lines (black to white) would be travelling pretty fast so resolution is
    critical. Do you have any suggestions on something I can buy to see
    these lines? I sure would appreciate any input that you might have.
    Please be specific. If you don't want to post, please send me an email
    at so we can talk further.

    Thanks alot,

    Todd
     
  2. How about an optical mouse?
     
  3. Dave

    Dave Guest

    Use the Moire effect by placing another (fixed) grid of lines on top of the
    first, slightly angled. The moving patterns will cover a larger area and be
    easier to detect

    Dave
     
  4. Look at the HLC2705.
    This is part of a normal 'mouse' encoder, comprising two detectors in one
    package, and designed to work with a line spacing down to 0.036". It needs
    a seperate illumination source, but is small, and already contains
    step/direction decoding internally. It can be used with reflective
    surfaces (but is primarily designed for transmissive use).

    Best Wishes
     
  5. colin

    colin Guest

    I think you may need a graticule, or at least a narrow slit.
    Im thinking of making a graticule myself with .08mm pitch using some 0.04mm
    relay wire.

    Colin =^.^=
     
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