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Specification of the LM393 chip- based rain sensor module is given below ... (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 ...
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