The goal is now to use a pre-wired rain sensor module with an Arduino. ... (hook up diagram) As usual, power up the Arduino from an external 9V DC power supply unit. The buzzer/relay driver circuit ...

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 ...

We wondered recently about those crude ASCII schematics you see in some documentation — are there any dedicated schematic-focused tools to draw them, or are they just hand-crafted using vario… ...