Capacitive Soil Moisture Sensor V2 – Analog Output 3.3–5.5V Corrosion-Resistant for Arduino & ESP32

A reliable capacitive soil moisture sensor V2 designed for accurate and long-lasting soil humidity detection. Unlike resistive sensors, this module uses capacitive sensing technology, making it corrosion-resistant and ideal for long-term use in soil.

With a simple analog output, it integrates easily with Arduino, ESP32, Raspberry Pi, and other microcontrollers for real-time moisture monitoring.

Key features

• Capacitive sensing – no exposed electrodes, reduced corrosion
• Analog voltage output for precise readings
• Wide operating voltage: 3.3V – 5.5V
• Stable and reliable performance over time
• Compact, easy-to-insert probe design
• Ideal for long-term soil monitoring projects

How it works

The sensor measures soil moisture by detecting changes in capacitance caused by water content in the soil. Higher moisture levels result in different analog voltage outputs, which can be read by a microcontroller.

Pinout & wiring

• VCC – Power supply (3.3V – 5.5V)
• GND – Ground
• AO – Analog output signal

Tip: Connect the analog output (AO) to an ADC pin on your microcontroller to read moisture levels.

Specifications

Common applications

• Automatic plant watering systems
• Smart irrigation and agriculture projects
• Arduino and ESP32 IoT systems
• Soil monitoring and environmental sensing
• Hydroponics and gardening automation

Important notes

• Avoid inserting the sensor fully past the electronics section to prevent damage
• Calibration may be required for accurate readings depending on soil type
• Analog values vary with moisture level and must be interpreted in software

Tip: For best results, take multiple readings and average them to reduce noise and improve accuracy.