Pd and Arduino with bluetooth would be my first choice for ease. PD can synthesize and sample and connects to arduino with few hassles.

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On Fri, Mar 5, 2010 at 11:19 AM, Rick Green rtg@aapsc.com wrote:

On Thu, 4 Mar 2010, Folderol wrote:

...

Also, use a short range photocell on the spokes (say 50mm). Easy to mount, reliable results with minimal effort. As these can usually respond up to 10-30kHz you won't have to worry about pedalling too fast :)

Sensing the spokes measures vehicle speed, not pedaling speed, you'd want your synth to drop to idle while you're coasting. I'm for a photocell watching the crank sprocket teeth in the rear interval where there's no chain. You also need to measure torque, or chain tension, to drive your synth's volume. An idler with a load cell on the top of the chain between the crank and the wheel can be used for a single-speed or three-speed in-hub transmission, but if you have a rear derailleur, you'll need another fixed idler between the sensor and the rear wheel. If you have a front derailleur as well, it just gets too complicated... Maybe the accelerometer is simpler after all, even if you have to compensate for incline. That's just math, not hardware.

-- Rick Green

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