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Topic: Reading engine RPM (Read 2447 times) previous topic - next topic

TomGeorge

Hi,
So you haven't connected the loop to the circuits?

The circuits load and filter the signal from the coil, if you just have a DMM connected to the coil then you will be picking up all sort of junk.

Tom.. :)
Everything runs on smoke, let the smoke out, it stops running....

donperry

I connected it in that fashion and it didn't work.
However, when I connected it directly to a mosfet the static turned the mosfet on.
having a pulldown between the gate and source allowed me to read RPM
....

Only one problem, the static seem to be destroying the mosfets! So this is a bummer too.

Johan_Ha

One low voltage source for pulses is the alternator. Internally it creates a 3 phase AC. You could pick one phase and with a diode make it a half phase signal rather easy to read. Its frequency is directly proportional to the engine RPM.
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If you ask for help and write 'u' instead of 'you' because you think it's convenient, I will write 'no' instead of 'yes'. For same reasons.

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