I'm going to be using my Arduino to do some high speed datalogging of cam and crank sensors and fuel injector signals but I'm new to electronics so I need a little bit of guidance.
I'm guessing that the fuel injector signals will be positive but the cam and crank signals are VR sensors so I'll see a positive spike followed buy a negative spike. I'm not sure what would happen but I know that the Arduino isn't a fan of negative voltages so I need some way of clipping the voltage. Is there a way to do this electronically? I've seen diodes mentioned but I don't really know which one to get or how they really work. Someone at work suggested an op-amp.