I'm interested in using a linear Hall effect sensor to measure displacement varying by about 1.5 inches. The idea is I have a piston with a magnet at the end and a Hall sensor at the end of the cavity to output a voltage roughly proportional to the proximity of the magnet.
Question is, what if I have several of these pistons side by side? They need to be less than half an inch apart. Will they interfere? I understand that the Hall sensor is only sensitive to magnetic field lines perpendicular to it. Does that mean that the magnetic field from a magnet displaced half an inch away horizontally will not register a voltage?