The 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 a control board that are separated for the ease of convenience, power indicator LED and adjustable sensitivity by way of a potentiometer. The analog output is used in measuring the amount of rainfall. Connected to 5V power supply, the LED will turn on when induction board has no rain drop, DO output is HIGH. When dropping a little amount of water, DO output turns LOW, the switch indicator will turn on! Brush off the water droplets, and when restored to the initial state, the output jumps back to HIGH. 
 

Features:

• Driving capability of 100 mA, enabling it to drive relays, buzzers, small fans and more
• LED indicators for power and output signal
• Adjustable sensitivity via potentiometer
• Nickel Coated Sensor Board with 0.5 micron casing for longer life and to prevent corrosion and oxidation

Specifications

• Adopts high quality RF-04 double sided material. 
• 5cm x 4cm nickel plate
• Anti-oxidation, anti-conductivity, with long use time
• Comparator output - Clean output waveform is good, with driving ability over 15mA
• Potentiometer-adjustable sensitivity
• Working voltage: 5V
• Uses a wide voltage range LM393 comparator
• Output format: Digital binary and Analog Output AO
• Bolt holes for easy installation
• Small PCB size: 3.2cm x 1.4cm