Some tricks to making electronics immune to spark EMI/RFI:
Put a 10K carbon comp resistor in the HV wire to the spark plug as close to the plug as possible.
Use an EMI filter on the input to the micro from the Hall Effect position sensor. Digi-Key part # M9935CT-ND
Put ferrite sleeves on all...
Joined today because I was referenced in a couple of posts talking about making electronics immune to EMI/RFI from ignition systems. Will be posting here:
A new ignition circuit