I've started building a knock sensor, mainly for fun, but inspired by wanting to know if my engine is pinking or worse. It's based on an Arduino uno kit with a Hyundai Accent knock sensor. So far, if progressively lights 3 LEDs, depending on force of the 'knock'. https://youtu.be/L48oXoT2nMo Next step is to add a potentiometer so I can dynamically change the force thresholds that it lights the LEDs at and then attach it to the engine and see what happens with it running. How many on here are have done Arduino projects? Any Z related?