Rain Drop Sensor Module for Arduino

Key Specifications:

• Operating Voltage: 3.3V to 5V DC
• Sensor Board Material: FR-04 double-sided material with nickel plating
• Detection Area: Large (e.g., 5.0×4.0 cm) for better rain detection
• Output Types:
  • Digital (DO): TTL level (LOW when wet, HIGH when dry), drives relays/buzzers.
  • Analog (AO): Voltage output proportional to water amount (for microcontrollers like Arduino via ADC).
• Comparator: LM393 wide voltage comparator
• Sensitivity: Adjustable via onboard potentiometer.
• Indicators: Power (VCC) and Digital Output (DO) LEDs.
• Drive Capability: Around 100mA for direct driving.
• Size (Sensor Board): ~50x40mm or 3.2×1.4cm (control board).

How it Works:

The sensor uses parallel conductive traces on the PCB; water bridges these traces, changing resistance, which the LM393 comparator converts into clean digital (on/off) or analog (voltage) signals for your microcontroller.

Key Takeaway for Projects:

It’s perfect for weather stations, automated irrigation, or water level detection with Arduino/Raspberry Pi due to its dual output and easy integration.