Contact sensor

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A contact sensor can be placed to check whether doors and windows are open or closed. The sensor only knows those two states. The contact sensor works with a “reed switch”. The circuit is normally open, but when a magnet is nearby, the internal metal closes it.

The sensor can also be attached to other sensors that expose an open or closed circuit. With this behavior, you can also create a seat occupancy sensor or a water leak sensor.

Best optionZigbee Contact sensor - Aqara

aka T1. They are small and have a long battery life.

AliExpress | Amazon US | Amazon NL

MCCGQ11LM

Cheaper optionZigbee Contact sensor - Tuya

Small and cheaper.

AliExpress | Amazon US | Amazon NL

ZD08

2xAAA battery optionZigbee Contact sensor 2xAAA powered - Tuya

Battery powered, bigger, cheaper.

AliExpress | Amazon US | Amazon NL

ZD06

IP65 waterproof optionZigbee Waterproof IP65 Contact sensor 2xAAA powered - Tuya

AliExpress

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More buy tips

← Best Buy TipsOverview of all layers and hardware

Motion sensorTrigger lights and alerts when someone moves. Presence detection sensorDetect people, even when they sit still. Leak sensorGet warned about water leaks early. Battery powered with PIRNot connected, but still smart with a built-in PIR sensor. Power adapters5V USB power adapters for your devices. Pressure sensorDetect weight on a chair, bed or mat.

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