LM39 soil moisture sensor with potentiometer and cables for Arduino

LM39 soil moisture sensor for Arduino, Raspberry Pi, ESP8266, ESP32

A sensor with a probe for precise soil moisture measurement. The module is adjusted using a sensitivity potentiometer. It has two outputs: digital D0 and analog A0, ensuring full compatibility with popular microcontrollers. The device is powered by a voltage in the range of 3.3V to 5V.

The kit consists of three parts: a measuring probe, a detector module, and connecting wires. The measuring probe is connected with wires to the detector and placed directly in the soil. The digital output signals when the set moisture threshold is exceeded, while the analog output returns an accurate measurement value.

Key technical features

• Operating voltage: 3.3V to 5V
• Outputs: digital (D0) and analog (A0)
• Indication: two status LEDs on the module
• Adjustment: setting digital output sensitivity with the built-in potentiometer
• Pinout: VCC, GND, D0, A0

Kit contents

• Measuring probe
• Detector module with comparator
• Connecting wires

Example applications

• Automatic watering systems for potted plants
• Moisture monitoring in home greenhouses and terrariums
• Microcontroller-based weather station projects
• Alarm systems for soil drying in crops
• Educational projects in automation and precision agriculture

Benefits

• Easy integration with popular development platforms
• Choice between analog and digital signal depending on project needs
• Simple threshold calibration thanks to the built-in potentiometer
• Quick assembly and connection thanks to the included wires
• Instant visual status check via the status LEDs