I have been looking for a way to get the RPM from a 2 stroke engine.
I am not sure what is the best option so far I found out two ways:
or this one
The opto-coupler sounded like a good idea but I am not sure if I can connect it to my engine.
I am using this kind of ignition coil:
I was thinking first to try to get a square like signal from the oscilloscope then after try to work out the code on the arduino.
I could not find a clear example for a 2 stroke engine.