/*Write a program to interface LED and Bluetooth module, to switch on the LED if 1 is 
passed through Bluetooth and switch off the LED if 0 is send. */
char data=0;
int led=13;
void setup() {
Serial.begin(9600);
pinMode(13, OUTPUT); 
//pinMode(12, OUTPUT); 
  
}

void loop() {
if (Serial.available()>0)
 Serial.print(data);
 Serial.print("\n");
 char data=Serial.read();
 switch(data) 
{
case'a':
digitalWrite(13, HIGH);
break;
digitalWrite(13, LOW);
break;    
default:
break;
{
 delay(100);
}         
/*digitalWrite(12, HIGH);
delay(1000);
digitalWrite(12, LOW);


}
}