Go Down

Topic: Reading engine RPM (Read 3125 times) previous topic - next topic


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....


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.


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.

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.

Go Up