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Reply to "Rotary binary encoder"

The encoder I found is a surface-mount unit, just a wee thing:

http://www.usdigital.com/products/aedr/

It would have to be mounted to a small board near the wheel hub, and be connected by wire to the display/power unit.

So far I've only found a two-inch disk, which seems a bit small for our needs, but will suffice if I can mount it to the bike wheel.

Weatherproofing will be an issue, as will encoder-disk clearance. This counter will be a semi-permanent installation, unlike the JO counter. It's more akin to Neville's calibrated-rim setup, with the advantage of the machine counting the partial revolutions.
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