FC-28 Soil Moisture Sensor
FC-28 Soil Moisture Sensor - Image 2
FC-28 Soil Moisture Sensor - Image 3

FC-28 Soil Moisture Sensor

₹105.00

Overview

The FC-28 Soil Moisture Sensor is a widely used, low-cost electronic module designed to measure the volumetric water content in soil. It operates on the resistive measurement principle: as moisture content in the soil increases, its electrical conductivity increases (resistance decreases). Conversely, dry soil exhibits high electrical resistance.

The sensor assembly consists of two main components:
• Soil Probe: A two-pronged PCB probe inserted directly into the soil to detect electrical conductivity changes.
• Control Module: Built around the LM393 low-power dual voltage comparator IC, featuring an adjustable potentiometer for threshold sensitivity, dual output pins (Analog & Digital), and power/status LED indicators.

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Description

Key Specifications

Parameter Specification Value / Description
Module Model FC-28 Soil Moisture Sensor
Operating Voltage 3.3V to 5V DC
Operating Current 15 mA approx.
Comparator IC LM393 Dual Differential Comparator
Output Types Dual Output: Analog Output (AO) & Digital Output (DO)
Analog Output (AO) Real-time continuous voltage (0V to VCC proportional to moisture)
Digital Output (DO) HIGH / LOW logic state based on threshold set by potentiometer
Sensitivity Adjustment On-board potentiometer / trimmer resistor
PCB Dimensions Probe: ~60mm x 20mm | Control Module: ~32mm x 14mm
Indicators Power LED (Red) & Digital Switching Output LED (Green)

Module Pinout & Interface Details

  • VCC: 3.3V – 5V Power Supply
  • GND: Ground Connection
  • DO: Digital Output (Outputs LOW when soil moisture exceeds threshold)
  • AO: Analog Output (Provides variable voltage signal corresponding to soil moisture level)

Applications and Uses

  • Automatic Plant Irrigation Systems: Triggers water pumps or solenoid valves automatically when soil moisture drops below a set threshold.
  • Smart Agriculture & Precision Farming: Integrated into IoT networks to monitor soil conditions across agricultural fields and optimize water usage.
  • Home & Garden Automation: Keeps indoor house plants, green gardens, or balcony pots at optimal moisture levels without manual intervention.
  • Environmental & Soil Research: Used in educational setups, weather monitoring stations, and ecological studies to record soil hydration trends over time.
  • Academic Projects & Prototyping: An essential component for robotics, Arduino, Raspberry Pi, ESP32, and STEM education projects focusing on sensor technology and automation.

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FC-28 Soil Moisture Sensor

₹105.00