This may be a dumb question but why couldn't you just connect a mosfet to the ignition coil signal (12v side) and have the arduino count the pulses? If it is a 4 stroke motor, 1 pulse = 2 revs?
This may be a dumb question but why couldn't you just connect a mosfet to the ignition coil signal (12v side) and have the arduino count the pulses? If it is a 4 stroke motor, 1 pulse = 2 revs?