Arduino Rain Sensor Alarm * Realized using a pre-wired rain sensor module * Author: T.K.Hareendran * Prototyped ... The buzzer/relay driver circuit may be used for voltages in the range 5-12V. However ...

If you are designing your own intelligent “Graden Computer” with an optional digital plant moisture sensor/water pump controller that lights an LED to alert the user when it is time to water a potted ...