SMART PUMP SHIELD V2.1The mainboard will send the command to turn on the pump and suck water into the switch, the switch will separate the stream and will give just enough water for your plants. Then it will close the pump and the switch and continue to check when your plant needs water. Features: Eliminates the need for messy jumpers and breadboards, and connects all sensors and modules with ease! Integrated Arduino UNO into the mainboard, and programmed it easily. Power