I would like to achieve something along the lines of a snap on magnetic connector in my pcb design in order set simple four bit addresses. I'd like to have four solder-jumper type pads on the board that can either be turned on or off with a snap on magnet. The idea is that different connectors have varying arrangements of magnets so if a magnet lines up with a jumper on the board it will read as a 1 and if not it will read as a 0 ( assuming the magnetic connection closes the jumper ). However I'm aware that copper is essentially not magnetic so my question is; are there such things as SMD steel pads that a magnet would stick to? Also, am I being an idiot? Would this just interfere with the circuit and mess everything up?