Hall Effect Sensors are sometimes referred to as “switches” rather than sensors because of the on-off “digital” voltage signal they produce. Unlike magnetic sensors that produce an alternating current (AC) signal which varies in voltage with speed, Hall Effect Sensors produce a constant voltage
signal that can change abruptly from maximum voltage to nearly zero and back again regardless of engine speed. This produces a square wave output
signal that can be easily used by the onboard computer for timing purposes.