Soil Humidity Sensor Module | Hygrometer Soil Moisture Detection Sensor for Arduino Automatic Watering & Smart Garden Projects

Product Description

The Soil Humidity Sensor Module (Hygrometer Sensor) is a simple yet effective device for detecting the moisture level of soil, ideal for Arduino-based automatic watering and smart garden projects.

It works by measuring the electrical resistance between two probes inserted into the soil — the wetter the soil, the lower the resistance. The sensor outputs both analog and digital signals, allowing precise moisture monitoring and easy triggering of relays or pumps in automated irrigation systems.

This module is ideal for DIY projects, greenhouse automation, and environmental monitoring, providing an easy way to maintain healthy plant growth with minimal effort.

Key Features

• Sensor Type: Resistive soil humidity (hygrometer) sensor

• Operating Voltage: 3.3V – 5V DC (compatible with Arduino, ESP32, Raspberry Pi)

• Output Signals:

  • Analog Output (AO): Measures real-time soil moisture level

  • Digital Output (DO): HIGH/LOW signal from LM393 comparator

• Indicator LEDs: Power and digital output status indicators

• Adjustable Sensitivity: Potentiometer for moisture threshold adjustment

• Probe Material: Copper-coated corrosion-resistant electrodes

• Working Current: ≤ 20mA

• Operating Temperature: -10°C to +70°C

• Interface Pins: VCC, GND, AO, DO

• Module Size: Compact design for easy installation

• Compatibility: Works with Arduino, ESP32, Raspberry Pi, and other microcontrollers

Advantages

• Dual output (analog + digital) for flexible control and monitoring.

• Simple plug-and-play connection for microcontrollers.

• Adjustable sensitivity for different soil types.

• Helps automate irrigation systems efficiently.

• Cost-effective and reliable solution for small and large-scale plant monitoring.

Applications

• Automatic plant watering systems

• Smart gardens and greenhouses

• Soil humidity monitoring for agriculture

• Educational and DIY Arduino projects

• Environmental and hydroponic monitoring