Raindrops Detection Sensor Module a board on which nickel is coated in the form of lines. It works on the principle of resistance. When there is no rain drop on board. Resistance is high so we get high voltage according to V=IR. When rain drop present it reduces the resistance because water is a conductor of electricity and the presence of water connects nickel lines in parallel so reduced resistance and the reduced voltage drop across it. Raindrops Detection Sensor Module come in two different parts. Copper Pads Sensor Module Copper Pads This part has the exposed copper layers that act as variable resister where resister varies when water dropped on its surface. The more water on the surface of the rain pads the better is the conductivity and will result in a lower resistance. The sensor produces an output voltage through which it determines whether it is raining or not. Sensor Module This part of sensor module consists of a control sensor and a rain-sensing pad which can be connected to any microcontroller/Arduino/ESP32/ESP8286. The module produces an output voltage according to the resistance of the sensing pad and is given at the analog output pin. The same signal is also passed over to the LM393 high-precision comparator to digitize and is made available at the TTL digital output pin. Specification: high quality of RF-04 double sided material. Size: 5cm x 4cm nickel plate on side. Comparator output signal clean waveform is good, driving ability, over 15mA. Come with Potentiometer to adjusts the sensitivity. Working voltage: 5V. Output format: Digital switching output (0 and 1) and analog voltage output AO. With bolt holes for easy installation. PCB size: 3.2cm x 1.4cm. Uses a wide voltage LM393 comparator. Package Includes : 1 x Printed Circuit Board for Rain Water Collection ( 5 x 4 cm) 1 x 2 Pin Dupont Cable (20cm) 1 x Sensor module
