Soil Moisture Sensor Module

Soil Moisture Sensor Module

The Soil Moisture Sensor Module is a simple and effective solution for monitoring the moisture level of soil in gardens, farms, potted plants, and smart irrigation systems. By measuring the electrical resistance between its two conductive probes, the sensor accurately determines the amount of water present in the soil, helping maintain optimal growing conditions for plants.

Designed for compatibility with Arduino, ESP32, Raspberry Pi, and other microcontroller platforms, this sensor is widely used in automated watering systems, agriculture projects, and IoT-based environmental monitoring applications. The onboard LM393 comparator provides stable operation and supports both analog and digital output modes.

Key Features

• Measures soil moisture content accurately using dual probes.
• Supports both Analog and Digital output signals.
• Compatible with Arduino, ESP32, Raspberry Pi, and other development boards.
• Adjustable moisture threshold through onboard comparator.
• Built-in LM393 comparator for reliable performance.
• Power and output status indicator LEDs.
• Easy installation with mounting holes.
• Low power consumption for continuous monitoring applications.

Technical Specifications

• Operating Voltage: 3.3V – 5V DC
• Output Type: Analog (AO) and Digital (DO)
• Comparator IC: LM393
• Detection Method: Soil Resistance Measurement
• Status Indicators:
  • Red LED: Power Indicator
  • Green LED: Digital Output Indicator
• Mounting: PCB with fixing holes

Working Principle

The module uses two conductive probes inserted into the soil. Water present in the soil improves electrical conductivity between the probes, reducing resistance. The sensor measures this resistance change and converts it into analog and digital signals that can be processed by a microcontroller to determine soil moisture levels and automate irrigation systems.

Applications

• Smart Irrigation Systems
• Automatic Plant Watering Projects
• Home Gardening
• Agricultural Monitoring
• Greenhouse Automation
• Horticulture Projects
• Environmental Monitoring
• Water Resource Management
• Educational and Research Projects
• IoT-Based Farming Solutions

Advantages

• Easy to install and operate.
• Real-time soil moisture monitoring.
• Helps prevent overwatering and underwatering.
• Suitable for indoor and outdoor applications.
• Ideal for automation and IoT projects.

Package Includes

• 1 × Soil Moisture Sensor Probe
• 1 × Soil Moisture Sensor Control Module

Soil Moisture Sensor pinout