The soil sensor provides rapid access to soil temperature, humidity, electrical conductivity (EC), and pH data, facilitating optimal irrigation timing and quantity for plants, thereby ensuring the best growing environment. It accommodates a wide voltage power supply of 5-30V and transmits data via RS485, utilizing the reliable MODBUS-RTU protocol. The response of the soil sensor is swift, with stable and reliable output. Compatibility with Arduino UNO R3 and TTL to 485 expansion board allows for swift test environment setup.

The soil sensor boasts an IP68 protection level, vacuum-filled and sealed with black flame-retardant epoxy resin. The probe, crafted from 316 stainless steel, offers rust-proof, waterproof, anti-corrosion, salt-alkali corrosion resistance, and long-term electrolysis resistance properties. Its performance is influenced by the soil salt content. Compact in size, it can be buried in the soil for extended periods and is compatible with various soil types.

Wiring Diagram of soil sensor and Arduino Uno

Probe Material - 316 Stainless Steel

The soil sensor features an automatic temperature compensation function for conductivity, ensuring measurement accuracy regardless of environmental changes. Its applications span across agricultural irrigation, greenhouses, floriculture and vegetable farming, grassland pastures, rapid soil testing, plant cultivation, scientific experiments, grain storage, and the measurement of moisture content and temperature of various particulate matter.

Soil temperature and moisture directly influence plant growth and nutrient absorption. Soil electrical conductivity (EC) represents soil salinity, a crucial indicator of soil fertility and health. High soil salt content hinders water absorption by plants. Soil pH, or “soil reaction”, is an acid-base reaction of the soil solution, dependent on the concentration of hydrogen ions. It’s expressed by the pH value, with 7 being neutral, less than 7 acidic, and greater than 7 alkaline. Soil pH can generally be divided into the following levels:

PH value Soil acidity and alkalinity

＜4.5 Extremely acidic

4.5-5.5 Strongly acidic

5.5-6.5 acidic

6.5-7.5 Neutral

7.5-8.5 alkaline

8.5-9.5 Strongly alkaline

>9.5 Extremely alkaline

How to install and use the soil sensor

Features:

• 5-30V wide voltage power supply
• RS485 output, can be used with Arduino
• With automatic temperature compensation, high precision, fast response and stable output
• Stainless steel probe can be buried in soil or water for a long time
• Resin vacuum filling and sealing, IP68 protection level

Specifications:

• Power supply voltage: DC5-30V
• Power consumption: 0.5W@24V
• Output mode: RS485
• Detection parameters: Temperature, Humidity, Electrical Conductivity (EC), pH

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

EC parameters

• Measuring range: 0-20000us/cm
  
• Resolution: 1us/cm
• Accuracy: 0-10000us/cm@±3%FS, 10000-20000us/cm@±5%FS
• Temperature compensation: memory temperature compensation, compensation range 0-50°C

pH parameters

• Measuring range: 3-9pH
  
• Resolution: 0.1pH
• Protection level: IP68
  
• Probe material: anti-corrosion special electrode
• Sealing material: black flame retardant epoxy resin
• Working temperature: -20°C~+60°C
• Cable length: 2m
• Size: 123*45*15mm

Applications:

Documentation:

• Product wiki

Package Includes:

• 1 x RS485 Soil Sensor(Temperature & Humidity & EC & pH)