[Poseidon5817]

I'm assuming you are trying to put the Hall Effect sensor on the actual elevator carriage with the magnets mounted on the sides of the rails the elevator rides in (or something similar). I would have a counter that increments or decrements every time you pass a magnet, depending on the current direction of the elevator. Our team is using a Hall Effect sensor with an encoder using the Hall Effect to zero the encoder value. Works like a charm so far.