M5Stack Hall Unit (U084) – magnetic sensor for doors and mailboxes

The Hall unit reacts to a magnet. Put the sensor on the frame and a magnet on the door, hatch or mailbox lid, and Home Assistant knows when it opens. It can also count revolutions, for example on a water meter with a magnet.

An LED on the unit lights up when it senses the magnet, which makes it easy to mount correctly.

Works with

• ESPHome (binary_sensor, platform gpio)
• Arduino and UIFlow
• All M5Stack controllers with a Grove port

You also need

A controller, for example the AtomS3 Lite, and a magnet. Grove cable included.

Specifications

• Sensor: 3 × A3144E Hall switches
• Output: digital, active low
• Indicator: red LED
• Size: 32 × 24 × 8 mm

Manufacturer and documentation

Manufacturer: M5Stack Technology Co., Ltd, Block A10, Expo Bay South Coast, Fuhai Street, Bao'an District, Shenzhen, China, [email protected]. EU representative: Success Courier SL, Calle Rio Tormes 1, Planta 1, Derecha, Oficina 3, 28947 Fuenlabrada, Madrid, Spain, [email protected].

• Product documentation (M5Stack)
• Manufacturer certifications (CE/RoHS)

End-of-life electronics must be taken to separate collection. Read about e-waste.