The A3144 is an integrated Hall effect non-latching sensor. That's nice but what does it do? Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor. A reed sensor also works nicely but can be limited by the glass encapsulation and size. A hall effect sensor is much smaller but can handle less current than a reed switch.
Here we have used an NPN transistor that acts as a switch and as an amplifier. The whole circuitry can be controlled using a bar magnet having both the poles north-south.

The circuit diagram and further explanation is given below in the link: [ Ссылка ]

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