Bluetooth Home automation using Arduino UNO.

// programmed by KAVIKUMARAN G
// Electrical and Electronics Engineering 

//Visit : Pickupmyskills.com

char incoming_value = 0;  

void setup() 
{

  pinMode(13, OUTPUT);  
  pinMode(12, OUTPUT);   
}

void loop() {

  switch (incoming_value) {
    case '1':               
      digitalWrite(13, HIGH);  
      break;
    case '2':               
      digitalWrite(13, LOW);  
      break;
    case '3':               
      digitalWrite(12, HIGH);  
      break;
    case '4':               
      digitalWrite(12, LOW);  
      break;
    default:
      Serial.print("invalid");
      break;
  }
}