How do they work?
How do I get a reading from one?
I'm mainly looking at an oil pressure sensor at the moment. I have temp sensors sorted by using a thermistor in a voltage divder circuit. Which is easy, I understand how this works. But how do you get the reading from sensors with just one wire?
Obviously it grounds through the engine, and has the bias resistor inside the sensor.. But that leaves me with either voltage in, or voltage out of the single pin. Obviously I can't get voltage out without putting voltage in.
So how does it work? Seems like black magic to me..........