bluethood led asaah

 char junk;

String inputString="";

void setup()                    // run once, when the sketch starts

{

 Serial.begin(9600);            // set the baud rate to 9600, same should be of your Serial Monitor

 pinMode(13, OUTPUT);

}

void loop()

{

  if(Serial.available()){

  while(Serial.available())

    {

      char inChar = (char)Serial.read(); //read the input

      inputString += inChar;        //make a string of the characters coming on serial

    }

    Serial.println(inputString);

    while (Serial.available() > 0)  

    { junk = Serial.read() ; }      // clear the serial buffer

    if(inputString == "F"){         //in case of 'a' turn the LED on

      digitalWrite(13, HIGH);  

    }else if(inputString == "B"){   //incase of 'b' turn the LED off

      digitalWrite(13, LOW);

    }

    inputString = "";

  }

}