Product use: 
rain, rain sensor, can be used for all kinds of weather monitoring, and translated into output signals and AO.
The sensor USES the high quality FR - 04 double material, large area of 5.5 * 4.0 CM, 
treatment of nickel plating and surface, have fight oxidation, electrical conductivity, and life has more superior performance;
The comparator output, signal clean, good waveform, driving ability is strong, for more than 15 mA;

With potentiometer sensitivity adjustment

The working voltage of 3.3 V to 5 V
The output format: digital switch output (0 and 1) and analog AO voltage output;
Has a fixed bolt hole, convenient installation
Small board PCB size: Approx. 3.2 cm x 1.5 cm

The LM393, use of wide voltage comparator