Jonathan Gazeley: ... > I want to measure how fast I'm turning the pedals on my bike (the > "cadence") and synthesize/sample the sound of an internal combustion engine. ... Sounds like fun. > 1. A sensor that can measure my cadence. A simple magnet switch that > triggers once a revolution won't be enough to measure the cadence with > sufficient resolution, since my cadence is usually between 50 and 80 > rpm. I would probably need to mount multiple magnets spaced equally > around the chainwheel and have a single sensor on the frame. Then I have > to get it to supply this information to my control program. ... Why don't you put an inductive sensor [1] at the pedal gear teeth? You could probably mount it at the chain protective cover if the tolerances are the right. Have a look at Omron "E2E-X5MF1 2M" [2,3] (you might have to paint it to protect it from water). For that one you need 12-24V DC. Regards, /Karl [1] http://en.wikipedia.org/wiki/Inductive_sensor [2] http://www.ia.omron.com/product/family/449/index_fea.html [3] http://www.ia.omron.com/product/item/e2e_7258d/index.html ----------------------------------------------------------------------- Karl Hammar Aspö Data karl@xxxxxxxxxxx Lilla Aspö 148 Networks S-742 94 Östhammar +46 173 140 57 Computers Sweden +46 70 511 97 84 Consulting -----------------------------------------------------------------------
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