Example Code for Arduino-Control Water Pump ON/OFF

Hardware Preparation

• DFRduino UNO R3 x 1
• Gravity: Digital Push Button (Red) x 1
• Gravity: Digital Push Button (Blue) x 1
• M-M/F-M/F-F Jumper wires

Software Preparation

• Arduino IDE

Wiring Diagram

• Magnetic Latching Relay
  • VCC to UNO 5V
  • GND to UNO GND
  • Pin A to UNO D3
  • Pin B to UNO D2
• Magnetic Latching Relay
  • Pin A to Water Pump Positive
  • COM to Battery Positive
• Battery
  • Negative to Water Pump Negative
• Blue Button
  • Pin D to UNO D13
  • Pin + to UNO 5V
  • Pin - to UNO GND
• Red Button
  • Pin D to UNO D4
  • Pin + to UNO 5V
  • Pin - to UNO GND

Sample Code

int INA = 3;
int INB = 2;
int buttonA = 13; //Set Button A as blue button, connect to Pin 13 
int buttonB = 4; //Set Button B as red button, connect to Pin 4 

void setup() {
  pinMode(INA, OUTPUT);
  pinMode(INB, OUTPUT);
  pinMode(buttonA, INPUT);
  pinMode(buttonB, INPUT);
}
void loop() {
  if (digitalRead(buttonA) == HIGH) 
    {
      digitalWrite(INA, HIGH); 
      delay(2); //2ms pulse signal 
      digitalWrite(INA, LOW); 
    }
  if (digitalRead(buttonB) == HIGH) 
      digitalWrite(INB, HIGH);
      delay(2);//2ms pulse signal 
      digitalWrite(INB, LOW);
  }
}

Result

When the program is downloaded, press down the blue button, the water pump turns on. Press down the red button, it turns off.