The goal is now to use a pre-wired rain sensor module with an Arduino. Specification of the LM393 chip- based rain sensor module is given below ... The buzzer/relay driver circuit may be used for ...

The hardware is consists of an Arduino microcontroller (here an Arduino Uno R3) and a pre-wired soil moisture sensor module. The soil moisture sensor module , built around the LM393 comparator, gives ...

Nevertheless, this could be a handy sensor, and it’s definitely a solid lesson in design. Still, if your tastes run more toward using this module on the 1.25-cm ham band, have a look at this ...