Koneksi bluetooth arduino uno r3

koneksi bluetooth

/*
simple LED test
*/

char val;         // variable to receive data from the serial port
int ledpin = 13; 

void setup()
{
    pinMode(ledpin, OUTPUT);  // pin 13 (on-board LED) as OUTPUT
    Serial.begin(9600);       // start serial communication at 115200bps
}

void loop() {
  if( Serial.available() )       // if data is available to read
  {;}
    val = Serial.read();         // read it and store it in 'val'

    if( val == '0' )               // if '0' was received led 13 is switched off
    {
        digitalWrite(ledpin, LOW);    // turn Off pin 13 off
        //delay(1000);                  // waits for a second 
        Serial.println("13 off");
    }

    if( val == '1' )               // if '1' was received led 13 on
    {
        digitalWrite(ledpin, HIGH);  // turn ON pin 13 on
        //delay(1000);                  // waits for a second
        Serial.println("13 on");
    }
}