ArduinoBluetooth.ino

char ch;                                                                   

void setup() {
 pinMode(13, OUTPUT);

 Serial.begin(9600);
}

void loop() {
  if (Serial.available()) {
  
     ch = Serial.read();
    switch (ch) {
     case '1': digitalWrite(13,HIGH); break;
     case '2': digitalWrite(13, LOW); break;
     default: break; 
    }
  }
  delay(100);
}