I want to detect induced voltage on a conductive ring when a magnetic field was changed. The amount of voltage is not matter for me. I want to do this by Arduino UNO R3. But I don't know how to do it as well as say you that i am new to Arduino.
Without more info, you could try an inductor, however depending how strong the mf is, the induced voltage might be small in which case you may need to amplify the signal before passing to an input pin...
