RS485 MODBUS-RTU IP68 Soil Temperature & Moisture Sensor for Automatic Irrigation (Arduino Compatible)

The RS485 MODBUS-RTU Soil Temperature and Moisture Sensor provides reliable, real-time ground condition monitoring for automated irrigation and greenhouse systems. Built with an IP68-rated waterproof body and 316 stainless steel probes, it is designed for long-term underground deployment. It is ideal for makers, agricultural researchers, and students building automated climate and irrigation controllers.

Arduino and RS485 MODBUS integration

The sensor communicates via standard MODBUS-RTU over an RS485 interface and supports a wide DC input voltage range of 5V to 30V. It interfaces cleanly with microcontrollers such as the Arduino Uno via a TTL-to-RS485 adapter board for rapid project development.

Durable 316 stainless steel probe

The probe is constructed from 316 stainless steel and vacuum-sealed in flame-retardant black epoxy resin. This design delivers IP68 water ingress protection and high resistance to rust, electrolysis, and salt-alkali soil conditions.

Soil health and installation

Tracking ground temperature and water levels ensures roots absorb nutrients efficiently while preventing problems caused by dehydration or oxygen-deprived waterlogging. The unit measures 123 x 45 x 15 mm and includes an integrated 2-metre cable for convenient burial.

Versatile agricultural applications

The sensor is suited for greenhouses, fruit orchards, pasture monitoring, grain storage, soil rapid testing, and scientific laboratory experiments.

High precision measurement specifications

It measures moisture from 0% to 100% with a resolution of 0.1% and accuracy of up to plus-or-minus 2%. Temperature measurement covers -40°C to +80°C with 0.1°C resolution and plus-or-minus 0.5°C accuracy.

Downloads & documentation

• Product wiki (DFRobot)