10-12 bit absolute rotary encoder

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  • #5964
    AvatarAnonymous
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    I’m looking for a low cost rotary encoder for my robots. I’d love to find a good one that plugs into arduino easily (i2c?) and gives me real time position information. Anyone?

    #6474
    AvatarAnonymous
    Inactive

    If you take apart any cheap inkjet printer, in front of you is the definately the cheapest way to encode position.

    Combine this:
    http://www.pollin.de/shop/downloads/D120525D.PDF

    With a laser-printed “grey strip”:
    https://github.com/thunderbug1/encoder_pattern_generat
    laser-printed @ 1200dpi+ on transparency film, and you’re done!

    🙂

    at least, that what is suggested here:
    https://www.thingiverse.com/thing:102515

    #6475
    AvatarAnonymous
    Inactive

    Optomechanical mouse guts + quadrature encoder chips

    http://www.boondog.com/tutorials/mouse/mouseHack.htm

    #6476
    AvatarAnonymous
    Inactive

    Nice. Most people don’t have a ball any more. Can we get the laser sensor to read the narrow side of the disc ?

    #6477
    AvatarAnonymous
    Inactive

    You can purchase “slit-type” optical gates new but they cost a bit more and you need to make a wheel for them.

    I purchase a lot of 10 NOS on eBay for $2.50 each including shipping. Each mouse has 2 encoders. They are an pair of IR LEDs and detectors and a slotted wheel. They encoder chips detect the phase relationship of the edges and have a counter you can poll. This saves the overhead ( and possible missed pulses ) of frequent interrupts.

    You could also make a wheel of alternating reflective and non-reflective wedges and bounce a light source off that.
    http://www.mcmanis.com/chuck/robotics/projects/encoders/enc_quad.htm

    There are also kits http://www.robotshop.com/en/cytron-simple-rotary-encoder-kit.html . For that one you keep track of direction and count pulses.

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