other magnetic sensing related purposes.

The main part of the circuit is a NC (Normally Closed) reed switch. The circuit will also require a small size of permanent magnet to be fitted on the corner of the door in front of the reed switch that will be placed at the boarder of the door.

A relay switch is used at the output of the circuit, from which you can connect the connection of an AC lamp that you want to open. The operating voltage of the circuit is 5V to 15V DC. It is important to use the same voltage relay according to the supply voltage.
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Here is a very useful project of an automatic door sensor light circuit. The circuit will automatically activate light of a room, storeroom, washroom etc. when you open the door and get inside and close it automatically when you get outside. The circuit can also be used for variety of
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Automatic Door Sensor Light Circuit Diagram