Hall sensor (Hall sensor) is a magnetic field sensor made according to the Hall effect. According to the Hall switch sensing method can be divided into: single S-pole Hall switch, single N-pole Hall switch, all-polarity Hall switch. Applications include laptop and tablet switch detection, TWS Bluetooth headset, electronic lock, valve position detection, water meter, gas meter, flow meter, non-contact detection, brushless motor, jump rope counting, toys and so on.