RAIN DROP SENSOR Module uses a wide voltage LM393 comparator. The sensor uses the high quality FR – 04 double material, large area of 5.5 x 4.0CM. Potentiometer adjust the sensitivity. Raindrop Sensor is a tool used for sensing rain. It consists of two modules, a rain board that detects the rain and a control module, which compares the analog value, and converts it to a digital value. The raindrop sensors can be used in the automobile sector to control the windshield wipers automatically, in the agriculture sector to sense rain and it is also used in home automation systems.