I most at times put my laundry outside on the balcony and I developed this Arduino rainfall detector to let me remember when the rain starts.
A nice project for beginners, Let’s discuss how you can build a simple rain detector employing the rain sensor and a buzzer. The detector will start a beep to let you understand the rain has begun.
Raindrop sensor is primarily a board on which nickel is coated in the form of lines. It works on the law of resistanceRain Sensor module enables to measure moisture through analog output pins and it gives a digital output when a threshold of moisture exceeds.
The sensor is a resistive dipole that shows less resistance when wet and more resistance when dry. When there is no raindrop on board, it reinforces the Resistance so we get high voltage according to V=IR.
When raindrop present it decreases the resistance because water is a conductor of electricity and the presence of water joins nickel lines in parallel, so reduces resistance and reduces the voltage drop across it.