Electronique capteur effet hall magnetic sensor APX 9141

How to recover a Hall effect sensor from a computer fan. How to connect the Hall effect sensor. APX 9141 Magnetic sensor. A Hall effect sensor measures a variation in a magnetic field. It is therefore an inductive sensor. It is also used as a contactless position detector, in brushless motors for example. They are also used in mechanics to detect the position or speed of a part, such as a rotating shaft. Many laptop models, some smartphones, and some digital tablets have a Hall effect sensor to detect when the lid is closed.