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 ...

We build the Arduino based Multi-house Water Pump ... connect the Arduino Nano board with the uploaded source code to it. Provide an unregulated supply of 15V to 18V DC across the Vcc and GND.

IC2 output will flip to low level, and RL1 will be switched off by relay-driver transistor ... bore-well pump is shown in Fig. 6. Connect the water-pump motor across CON3 and 230V AC mains across CON4 ...