Not sure if I'm in the right place. But There are these phone probes to tell from one end of where the phone wire is at to the other end a line of some kind of tester when putting the probe on one end can figure out on the other end which wires are which some kind of I'm guessing. I would like to create one using a arduino But I'm not sure how to make one of theses. Could someone please help me out.
I guess it's also called a tracer of some kind.