int ledPin = 9;
int state = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
  Serial.begin(38400); // Default communication rate of the Bluetooth module
}

void loop() {
 if(Serial.available()){ // if data available at serial port
    state = Serial.read(); // assign incoming data to variable state
    Serial.println(Serial.read());

 }
 // Controlling the LED
 if (state == '1') {
  digitalWrite(ledPin, HIGH); // LED ON ;
 }
 else if (state == '0') {
  digitalWrite(ledPin, LOW); // LED ON ;
 }

}