10-12 bit absolute rotary encoder
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2014-04-18 at 15:45 #5964AnonymousInactive
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?
2014-05-07 at 01:07 #6474AnonymousInactiveIf 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.PDFWith 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:1025152014-06-19 at 23:12 #6475AnonymousInactiveOptomechanical mouse guts + quadrature encoder chips
2014-06-20 at 00:14 #6476AnonymousInactiveNice. Most people don’t have a ball any more. Can we get the laser sensor to read the narrow side of the disc ?
2014-06-20 at 01:16 #6477AnonymousInactiveYou 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.htmThere 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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