RS485 Soil Moisture, Temperature, and EC Sensor IP68 5-30V

This soil sensor from DFRobot measures soil moisture and soil temperature, plus the electrical conductivity (EC) as a measure of salinity with automatic temperature compensation and outputs the values via RS485 with the MODBUS-RTU protocol. The 316 stainless steel probe is sealed to IP68 and potted with flame-retardant epoxy resin, so it can stay in the ground permanently. The sensor is supplied with 5 to 30 V, the cable is 2 m long. An Arduino needs a TTL to RS485 converter.

Note: The salt content of the soil influences the moisture reading. Irrigation thresholds should therefore be set for the specific plant and soil (DFRobot).

Recommended Accessories:

• RS485 Shield for Arduino UNO
• Industrial USB to RS232/485 Converter FT232RNL
• SenseCAP S2100 LoRaWAN Data Logger

Features:

• Measures soil moisture, soil temperature and electrical conductivity (EC)
• Automatic temperature compensation of the EC measurement
• RS485 with MODBUS-RTU, several sensors on one bus
• Wide voltage range 5 to 30 V
• 316 stainless steel probe, corrosion-resistant
• IP68, vacuum-potted with flame-retardant epoxy resin, for permanent installation in the soil

Application Examples:

• Automatic irrigation in gardens and agriculture
• Greenhouses, flower and vegetable growing
• Orchards and lawns
• Experiments on plant growth and soil

Documentation:

• Wiki DFRobot SEN0601
• Example code for Arduino (DFRobot Wiki)
• MODBUS protocol (DFRobot Wiki)
• Selecting soil moisture sensors (DFRobot Wiki)
• Dimension drawing (JPG)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0601
• Supply: 5 to 30 V DC
• Power consumption: 0.7 W at 24 V
• Output: RS485
• Protocol: MODBUS-RTU, registers and commands in the wiki
• Moisture: 0 to 100 %, resolution 0.1 %
• Moisture accuracy: ±2 % at 0 to 50 %, ±3 % at 50 to 100 %
• Temperature: -40 to 80 °C, resolution 0.1 °C, accuracy ±0.5 °C
• EC range: 0 to 20000 µS/cm, resolution 1 µS/cm
• EC accuracy: ±3 %FS at 0 to 10000 µS/cm, ±5 %FS at 10000 to 20000 µS/cm
• EC temperature compensation: 0 to 50 °C
• Protection class: IP68
• Probe: 316 stainless steel
• Potting: black flame-retardant epoxy resin
• Operating temperature: -40 to 60 °C
• Wiring: brown VCC, black GND, yellow 485-A, blue 485-B
• Cable length: 2 m
• Dimensions: 123 × 45 × 15 mm
• Weight: 200 g

Scope of Delivery:

• 1× RS485 soil sensor moisture, temperature and EC with 2 m cable