I have been messing around with the Arduino for a while now, and love doing a bunch of limitless projects thanks heap's to everyone. :-)
Back on topic, I'm requiring some help and I am a little stumped on how to do it.
What I need to do is hook an Arduino up to a car battery and be able to detect if a car is running or not. Now I have tried to detect the voltage and that works well on my car by detecting the change of voltage, but when I hook it up to my partners car I get a very different result which is unreliable due to the voltage exceeding the charge voltage. I have also tried vibration sensing using a pizo but that is not sensitive enough.
So I am wondering if and how I can detect the noise that is created on the power connection + or - and get a reading of some sort.
Thanks Nathum :)