Firstly - thanks for creating this as open source - its an awesome bit of code !
Now, I've built the circuit as specified, and loaded 2.41 onto a nano - I also built the RPM generator circuit and everything works as it should - until I hook it up to the car.
engine is a Toyota 2gr-fe and I connected the 'rpm in' on the circuit to the trigger wire on the COP for cylinder #2.
The led display jumps around all the over the place reading from a few hundred rpm to 9000, regardless of selecting freq or intr with conditioning on or off.
hooked back up to the rpm generator, everything works as it should (bypassing the transistor input)
The Toyota coil is a 5v logic trigger - can you suggest where to start fault finding ?
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