Monday, May 26, 2014

Measure car engine speed RPM via the cigarette lighter

I setup my new oscilloscope to measure a car's engine speed by connecting to the cigarette lighter.  The inductive kicks from the ignition coil provide a timing signal that can be used to calculate RPM.  In this particular car (a DeLorean), the engine fires unevenly by design, so the inductive kicks are not all regularly spaced.

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