Needless to say, this is a simple experiment for Arduino beginners, but trying an experiment is even more pleasant when the result is something unique. The goal is now to use a pre-wired rain sensor ...

Using an ESP8266 programmed via the Arduino IDE, [OttoNL] hooked up a light dependent resistor, a rain sensor, and the all-round workhorse BME280 for temperature, barometric pressure, and humidity ...