Soil Moisture Sensor

MEASUREMENT FUNCTION: Designed to measure soil moisture levels by detecting the electrical resistance between two conductive probes inserted into the soil
POWER SPECIFICATIONS: Operates with a supply voltage range of 3.3V to 5V DC, ensuring compatibility with common microcontrollers and IoT development boards
SENSING PRINCIPLE: Utilizes dual conductive probes that allow current to pass through the soil; the resistance value changes based on moisture content, enabling moisture level detection
INTERFACE DESIGN: Supports both analog and digital output modes, allowing flexible integration with microcontrollers and automated monitoring systems
PIN CONFIGURATION: Provides VCC, GND, AOUT (analog output), and DOUT (digital output) pins for direct connection to MCU platforms such as Arduino, ESP32, and Raspberry Pi
SIGNAL PROCESSING: Integrated with an LM393 comparator chip to ensure stable signal processing and accurate moisture detection
SENSITIVITY CONTROL: Includes an onboard potentiometer that allows adjustment of the digital output threshold according to soil moisture requirements
STATUS INDICATION: Equipped with power indicator LED (red) and digital output indicator LED (green) to show module operation and detection status
MODULE DIMENSIONS: Compact PCB module measuring approximately 3 × 1.5 cm, with a soil probe size of about 6 × 3 cm and connecting cable length around 20 cm
APPLICATION SCOPE: Widely used in smart irrigation systems, automated plant watering setups, agricultural monitoring, horticulture projects, environmental research, and IoT-based soil moisture sensing systems