FC-28 Soil Moisture Sensor Module

FC-28 Soil Moisture Sensor Module (Resistive) | Arduino, ESP32, Raspberry Pi Compatible

The FC-28 Soil Moisture Sensor Module is a low-cost resistive soil moisture sensor designed to measure the moisture level of soil and other growing media. It uses two exposed conductive probes that act as a variable resistor. As the soil moisture increases, electrical conductivity between the probes also increases, resulting in lower resistance and a corresponding change in the analog output voltage.

The module features both analog (AO) and digital (DO) outputs, making it suitable for a wide range of microcontroller platforms including Arduino, ESP32, ESP8266, Raspberry Pi, STM32, AVR, PIC, and other embedded development boards. An onboard LM393 comparator allows users to adjust the digital output threshold using the built-in potentiometer.

Ideal for automatic plant watering systems, smart irrigation, greenhouse monitoring, agricultural automation, IoT projects, educational electronics, and DIY gardening applications, the FC-28 provides a simple and effective method of monitoring soil moisture levels. Since the sensing method is resistive, the exposed probes can corrode over time due to electrolysis if continuously powered. For longer sensor life, it is recommended to power the sensor only during measurements.

Key Features

• Resistive soil moisture sensing technology
• Measures moisture by detecting soil conductivity
• Analog and digital output signals
• Adjustable digital threshold using onboard potentiometer
• Compatible with 3.3V and 5V systems
• Built-in LM393 comparator
• Power and output status LEDs
• Easy interface with Arduino and other microcontrollers
• Compact design for embedded and IoT projects
• Simple installation and operation

Applications

• Automatic Plant Watering Systems
• Smart Irrigation Projects
• Agriculture Monitoring
• Greenhouse Automation
• Garden Soil Monitoring
• IoT Sensor Networks
• Arduino Projects
• ESP32 Projects
• Raspberry Pi Projects
• Educational Electronics
• DIY Automation Systems

Advantages

• Affordable and beginner-friendly
• Fast response time
• Easy integration with development boards
• Supports both analog and digital readings
• Adjustable sensitivity
• Suitable for DIY and educational projects

Important Note

The FC-28 is a resistive moisture sensor with exposed metal probes. Continuous power can accelerate probe corrosion through electrolysis, reducing sensor lifespan. For long-term installations, it is recommended to switch power to the sensor only when taking measurements or consider a capacitive soil moisture sensor for improved durability.