M5Stack soil moisture sensor (U019) – measure moisture in houseplants

Stick the sensor in the soil and find out when the plant needs water. With Home Assistant you can get a notification on your phone, or control a pump automatically.

Good to know

The sensor measures the resistance between two metal prongs. The prongs corrode over time if they sit in moist soil constantly, so measure at intervals rather than continuously. It gives both an analogue value and a digital signal with an adjustable threshold. If you want the pump and sensor in one, choose the watering unit (U101).

Works with

• ESPHome (sensor with the adc platform)
• Home Assistant via ESPHome
• M5Stack controllers with an analogue input on the Grove port

You also need

A controller, for example the ATOM Lite or AtomS3 Lite. Grove cable included.

Specifications

• Output: analogue and digital (threshold adjusted with a potentiometer)
• Connector: Grove (HY2.0-4P)

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.