RS485 Soil Temperature, Humidity and EC Sensor

1. Example Code for Arduino-Read Soil Temp, Humidity, EC

This project demonstrates how to use the RS485 Soil Sensor (Temperature&Humidity&EC) with Arduino UNO R3 to read real-time soil temperature, humidity, and electrical conductivity (EC) values. Users will learn how to establish RS485 communication using the ModBus-RTU protocol, send query commands to the sensor, and parse the returned data to obtain usable environmental parameters.

Reference

The article explains RS485 communication protocol using ModBus-RTU, detailing data frame formats, register addresses, and installation for effective sensor data collection.

Parameter	Details
Power supply voltage	DC5-30V
Power consumption	0.7W@24V
Output mode	RS485
Detection parameters	Temperature, humidity, EC
Humidity	0-100% range, 0.1% resolution, ±2% (0-50%)/±3% (50-100%) accuracy
Temperature	-40°C~+80°C range, 0.1°C resolution, ±0.5°C accuracy
EC	0-20000μS/cm range, 1μS/cm resolution, ±3%FS (0-10000μS/cm)/±5%FS (10000-20000μS/cm) accuracy
Temperature compensation	0-50°C (memory-based)
Protection level	IP68
Probe material	Anti-corrosion electrode
Sealing material	Black flame-retardant epoxy resin
Working temperature	-40°C~+60°C
Size	123x45x15mm
Cable length	2m

Num	Label	Description
Brown line	VCC	Power input (DC5-30V)
Black line	GND	Power ground
Yellow line	485-A	RS485 data line A
Blue line	485-B	RS485 data line B

RS485 Soil Temperature, Humidity and EC Sensor

Specification

Pinout