Specification:

Model :3.3-5V Rain Raindrops Detection Sensor Weather Humidity Module For Arduino
The sensor USES the high quality FR - 04 double material, large area of 5.5 * 4.0CM, treatment of nickel plating and surface, have fight oxidation, electrical conductivity, and life has more superior performance;
With potentiometer sensitivity adjustment;
The output format: digital switch output (0 and 1) and analog AO voltage output;
Has a fixed bolt hole, convenient installation;
The comparator output, signal clean, good waveform, driving ability is strong, for more than 15 mA;
The LM393, use of wide voltage comparator;
The working voltage of 3.3 V to 5 V;
Size: Like the picture show

Usage:
Connected to 5 v power supply power lights, no water droplets on induction plate, the DO output for the high level, switch lights out, a drop of water drops, the DO output for the low level, switch indicator,brush away the water droplets, return to again, the output high level state.
AO analog output, can be connected to the microcontroller AD mouth drops of rainfall in the above size.
DO TTL digital output can also be connected microcontroller detecting whether it will rain.

Package includes:
1Nos Rain Sensor
1Nos Rain Module
2Nos Dupont Cables