I know this should work- I should be able to wrap uninsulated wire around a spark plug wire and detect the pulses in an engine. However, I don't know what the "output" of said wire would be- I assume it would be a very small DC voltage spike? Does anyone know if it would be at levels an Arduino cou…

detecting RPM by wrapping a spark plug wire

Franklin November 26, 2008, 6:37pm 5

here's another good link.

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