Water Rain Drop Sensor

This rain sensor module is an easy tool for rain detection. It can be used as a switch when raindrop falls through the raining board and also for measuring rainfall intensity. The module features, a rain board and the control board that is separate for more convenience, power indicator LED and an adjustable sensitivity though a potentiometer.

The analog output is used in detection of drops in the amount of rainfall. Connected to 5V power supply, the LED will turn on when induction board has no rain drop, and DO output is high. When dropping a little amount water, DO output is low, the switch indicator will turn on. Brush off the water droplets, and when restored to the initial state, outputs high level.

Specifications of Rain Sensor

• High quality of RF-04 double sided material.
  
• Area: 5 cm x 4 cm nickel plate on side,
  
• Anti-oxidation, anti-conductivity, for long use time.
• Potentiometer adjust the sensitivity;
  
• Working voltage 5 volts
  
• Output format: Digital switching output (0 and 1) and analog voltage output AO;
  
• With bolt holes for easy installation;
  
• Small board PCB size: 3.2cm x 1.4cm;
  
• Uses a wide voltage LM393 comparator

Pin Configuration of Rain Sensor Board

1. VCC: 5V DC
   
2. GND: ground
   
3. DO: high/low output
   
4. AO: analog output

This is a very easy to use sensor and lot of information and Tutorials are provided online for this sensor. Check here for an Instructable on Rain Sensor interfacing with Arduino.