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Soil Moisture Sensor Module with Relay – 12V Automatic Irrigation Controller
The soil moisture sensor module is ideal for automating irrigation systems in gardens, greenhouses, orchards, or for flower care. The device constantly monitors the soil moisture level and automatically activates the relay connected to a pump, solenoid valve, or other watering equipment.
The two metal plates act as a measurement probe: when the soil is wet, conductivity increases, and resistance decreases. Thus, the module detects whether the soil needs water and turns the automatic irrigation system on or off according to the set thresholds.
This irrigation controller is extremely useful for anyone looking for a smart, efficient, and precise watering system without requiring manual intervention.
Usage Instructions
- Connect the module correctly according to the diagram in the product images.
- Insert the probe into the soil – the current moisture level will appear on the display.
- Press SET to access the F0 menu. Choose the value at which the relay turns off.
- Press SET again for F1 – set the value at which the relay turns on.
- The F2 function is for calibration (normally not required).
Technical Specifications
| Power Supply Voltage | DC 12V |
|---|---|
| Moisture Range | 20–99% RH |
| Control Accuracy | ±1% RH |
| Maximum Current Supported | 20A |
| Weight | ~28g |
| Dimensions | 52 x 43 x 16 mm |
Main Advantages
- Ideal for gardens, greenhouses, orchards, lawns, or indoor plants
- Automatic moisture control with integrated relay
- Easy to install and configure
- Reduces water consumption and optimizes irrigation
- Compatible with pumps, solenoid valves, and other devices
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