Arduino Bluetooth Basic Tutorial

1char data = 0;            //Variable for storing received data
2void  setup()
3{
4    Serial.begin(9600);   //Sets the baud for serial data transmission                               
5    pinMode(13, OUTPUT);  //Sets digital pin  13 as output pin
6}
7void loop()
8{
9   if(Serial.available() > 0)      //  Send data only when you receive data:
10   {
11      data = Serial.read();        //Read  the incoming data & store into data
12      Serial.print(data);          //Print  Value inside data in Serial monitor
13      Serial.print("\
14");        
15      if(data == '1')              // Checks whether value of data is equal to 1
16         digitalWrite(13, HIGH);   //If value is 1 then LED turns ON
17      else  if(data == '0')         //  Checks whether value of data is equal to 0
18         digitalWrite(13,  LOW);    //If value is 0 then LED turns OFF
19   }
20}
21