Arduino Code For Mobile Control Water Pump

void setup() {

Serial.begin(9600);

 pinMode(8, OUTPUT); // put your setup code here, to run once:

 }

void loop() {

  // put your main code here, to run repeatedly:

 if(Serial.available()>0)

   {     

      char data= Serial.read(); // reading the data received from the bluetooth module

      switch(data)

      {

        case 'a': digitalWrite(8, HIGH);break; // when a is pressed on the app on your smart phone

        case 'd': digitalWrite(8, LOW);break; // when d is pressed on the app on your smart phone

        default : break;

      }

      Serial.println(data);

   }

   delay(50);

}