Rain Detection Sensor Module for Arduino & DIY Electronics

This Rain Detection Sensor Module is designed to detect rainfall, water droplets, and moisture levels for weather monitoring and automation projects. The module uses a high-quality FR-04 double-sided sensing plate with nickel-plated surface treatment, providing excellent conductivity, oxidation resistance, and long service life.

Equipped with an LM393 voltage comparator, the module offers both analog and digital outputs, making it suitable for a wide variety of Arduino, ESP32, Raspberry Pi, and IoT applications.

Key Features

• High-Quality Sensing Plate – FR-04 double-sided board with nickel-plated surface for improved durability and conductivity.
• Large Detection Area – 5.5 × 4.0 cm sensing surface for reliable rain detection.
• Adjustable Sensitivity – Built-in potentiometer allows fine tuning of detection thresholds.
• Dual Output Modes – Digital output (DO) and analog voltage output (AO).
• LM393 Comparator – Clean signal output with strong driving capability (>15mA).
• Wide Operating Voltage – Compatible with 3.3V to 5V systems.
• Easy Installation – Includes mounting holes for convenient installation.
• LED Indicators – Visual indication of power and detection status.

How It Works

When the sensor plate is dry, the digital output (DO) remains HIGH and the indicator LED is off. When raindrops or water contact the sensing plate, the digital output switches LOW and the indicator LED illuminates.

The analog output (AO) provides a variable voltage corresponding to the amount of water detected, allowing microcontrollers to measure rainfall intensity and moisture levels.

Applications

• Weather Monitoring Stations
• Rain Alarm Systems
• Smart Irrigation Projects
• Automatic Window Closing Systems
• Vehicle Rain Detection
• IoT Environmental Monitoring
• Educational & STEM Projects
• Arduino & ESP32 Learning Projects

Technical Specifications

• Sensor Type: Rain / Water Detection Sensor
• Comparator IC: LM393
• Operating Voltage: 3.3V – 5V DC
• Output Modes: Digital (DO) & Analog (AO)
• Sensitivity Adjustment: Onboard potentiometer
• Detection Plate Size: 5.5 × 4.0 cm
• Signal Drive Capability: >15mA
• Mounting Holes: Yes
• Compatible Platforms: Arduino, ESP32, ESP8266, Raspberry Pi and other microcontrollers

Package Includes

• 1 × Rain Detection Sensor Plate
• 1 × LM393 Comparator Control Module

Perfect for students, makers, educators, and developers building weather monitoring, automation, and IoT projects.