Hall sensor
Earlier, when the cover of a mobile phone was turned on and the screen was lit, the Hall sensor was operating. In the current smartphone era, the Hall sensor is still useful, and it is used to support various motion settings of the magnetic flip protective cover. When you close the cover and open the cover on a magnetic flip phone, signals are close to and away from the Hall sensor. The sensor transmits signals to control the screen to be on or off.
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