This sensor module detects raindrops. It can be used in a weather monitoring station, home automation system and many more.
The sensor itself is a plate with nickel plating tracks on both sides. This plate is to be connected to the 2 pin header on the comparator board. Because water is indeed an electricity conductor, whenever there are water drops, the tracks are shorted and this will be picked up by the comparator circuit.
The board has a LM393 voltage comparator chip to give out digital output and a potentiometer for sensor sensitivity adjustment. The working voltage of this module is between 3.3V and 5V. There are 4 pins for output marked as VCC, Ground and DO and AO.
The Digital Output (DO) pin gives digital output and you can read it easily with any microcontroller/microprocessor. When the sensor detects raindrops on the sensor plate, it gives output LOW. When no raindrops detected, it gives output HIGH.
There is also an Analog Output (AO) pin that you can connect to the analog pin of your microcontroller to read the analog data.
There are 2 status indicator LEDs on board. The one marked as PWR-LED is to tell us the power is connected and the one marked as DO-LED is to indicate raindrops detection. There are mounting holes on the PCB so that you can fix the position of this module.
Jumper wires connecting the sensor board and the comparator board is included.
Technical details:
Operating voltage: 3.3V - 5V
Red LED (PWR-LED) - operational status indicator
Red LED (DO-LED) - digital output status indicator
DO red LED ON, output LOW - raindrops detected
DO red LED OFF, output HIGH - no raindrops detected
A potentiometer that can be used to adjust sensitivity
