Raindrops Detection Sensor Module

Raindrops Detection Sensor Module provides a straightforward and reliable way to detect rainfall or moisture, making it an essential component for automated weather stations and smart irrigation systems. This two-part module consists of a printed circuit board (PCB) that acts as the rain sensing plate and a comparator module. The sensing plate uses exposed copper traces to measure changes in resistance when water bridges the gaps, signaling the presence of raindrops. The comparator module then converts this analog resistance change into a clean digital output (high or low) and also offers an analog output for more nuanced measurement of rain intensity. You can easily integrate this low-cost sensor with any micro-controller, such as Arduino or ESP32, to automate actions like closing a window, turning off a sprinkler system, or triggering an alarm.

Key Features:

• Dual Output Modes: Provides both a digital output (D0) for simple ON/OFF rain detection and an analog output (A0) for measuring the intensity of the rainfall.
• Adjustable Sensitivity: Features an on-board potentiometer, allowing you to fine-tune the detection threshold for the digital output according to specific project requirements.
• Low Power Consumption: Operates efficiently on standard 3.3V or 5V power supplies, making it suitable for battery-powered, remote weather monitoring devices.
• Split Design: Separates the detection grid from the control circuit, facilitating flexible installation, placing the grid outdoors and the electronics indoors.
• Integrated LED Indicators: Includes a power LED and a digital output status LED for quick visual feedback and troubleshooting during development.

Technical Specifications:

• Operating Voltage (VCC): 3.3 V to 5 V DC
• Output Type: Digital Switch Output (D0) and Analog Voltage Output (A0)
• Sensor Current Draw (Standby): < 5 mA
• Comparator Chip: LM393 or equivalent
• Signal Type: Resistance change on the sensor plate (analog)

Mechanical Specifications:

• Module Components: Raindrop Sensor Plate and Comparator Control Module
• Material (Sensor Plate): FR4 PCB with nickel-plated copper traces
• Mounting: Two mounting holes on both the sensor plate and the control module for secure installation.

Dimensions:

• Sensor Plate Size: ≈ 54 mm x 40 mm
• Control Module Size: ≈ 30 mm x 16 mm
• Interconnect Cable Length: ≈ 20 cm
• Weight (Combined): ≈ 15 g

Pinout and Wiring:

• VCC: Connect to 3.3V or 5V power supply.
• GND: Connect to the ground (0V) of the power supply.
• D0 (Digital Out): Connect to a digital input pin on your micro-controller. Outputs HIGH when dry, LOW when wet (or vice versa, depending on the internal pull-up/down).
• A0 (Analog Out): Connect to an analog input pin on your micro-controller (ADC pin). Provides a variable voltage proportional to the amount of water detected.

Datasheet Reference:

• Download Rain Sensor Module Specification

Commonly Used in:

• IoT Projects: Used widely in internet-connected smart home and garden systems.
• Hobby Robotics: Implemented in rain-avoidance robots or moisture monitoring devices.
• Weather Monitoring Stations: Essential component for triggering logging or display when precipitation occurs.

Applications:

• Smart Irrigation Control: Automatically shuts off lawn sprinklers when rain is detected, conserving water.
• Automatic Window Closers: Integrates with servo motors or linear actuators to close skylights or windows when it starts raining.
• Automotive Applications: Used in prototype systems for detecting rain to automatically turn on car wipers.

Equivalent Models:

• Capacitive Rain Sensors: Offers higher sensitivity and less corrosion over time compared to the resistive-based plate.
• Optical Rain Sensors: Uses infrared light for robust, maintenance-free detection, often found in professional systems.
• YF-S201 (Flow Sensor): Not an equivalent, but often paired with this module for comprehensive water management projects.

Package Includes:

• 1 x Raindrops Detection Sensor Plate
• 1 x Comparator Control Module
• 1 x Jumper Wire Set (to connect the two modules)