Something I thought about today, you should probably put a flyback / snubber diode on the relay coil (maybe like a 1N4007) to suppress the inductance voltage from slapping your controller around.
Illustrated here in a short video I made:
Something I thought about today, you should probably put a flyback / snubber diode on the relay coil (maybe like a 1N4007) to suppress the inductance voltage from slapping your controller around.
Illustrated here in a short video I made: