Linear hall effect sensor - A1321

From bildr

Manufacturer: Allegro
Voltage: 4.5-5
Communication: Analog

The A1321 is a very simple linear hall effect sensor. When no magnetic field is near, the sensor outputs half of the supply voltage. When the south pole of a magnetic field approaches the sensor, the voltage output falls linearly with distance, eventually to 0. When a north pole field approaches the sensor, the voltage output climbs towards the supply voltage (4.5-5v).

Hooking it up

Using the A1321 is very simple and only requires power to operate. The output of the sensor can be connected to an analog input on any microcontroller to read the value.