This soil temperature and moisture sensor measures soil temp & moisture. It has 5-30V wide voltage, RS485 output, fast response, and stable output. It works with Arduino UNO R3 + TTL to 485 board for quick setup. With IP68 protection, vacuum-sealed black flame-retardant epoxy, and 316 stainless steel probe (rust-proof, waterproof, anti-corrosion, salt-alkali resistant, long electrolysis resistance), it’s small, suitable for long-term soil burial and various soils. Note: It’s more affected by soil salt content.

Overview of RS485 Temperature&Humidity Soil Sensor

Downloadable Resources

Dimension

Docs

Tech Specs

1. Example Code for Arduino-Read Soil Temperature and Humidity

Insert the soil sensor into the soil, and the serial port will print out the temperature and humidity values detected by the sensor.

Reference

This article delves into the ModBus-RTU communication protocol for sensors, detailing its parameters, data frame formats, example communications, and methods for accurate measurement.

Specification

Parameter	Details
Power supply voltage	DC5-30V
Power consumption	0.5W@24V
Output mode	RS485
Detection parameters	temperature, humidity
Humidity parameters
- Measuring range	0-100%
- Resolution	0.1%
- Accuracy	0-50%@±2%, 50-100%@±3%
Temperature parameters
- Measuring range	-40°C~+80°C
- Resolution	0.1°C
- Accuracy	±0.5°C
Protection level	IP68
Probe material	anti-corrosion special electrode
Sealing material	black flame retardant epoxy resin
Working temperature	-40°C~+60°C
Size	123x45x15mm
Cable length	2m

Pinout

Num	Label	Description
Brown line	VCC	Power input positive pole, DC5-30V power supply
Black line	GND	Power ground wire
Yellow line	485-A	RS485 data line A
Blue line	485-B	RS485 data line B

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