const int ledPin = 11; //For connection to externally wired LED on Pin 11

char InChar;

void setup(){ 
  
  Serial.begin(115200);  //Initialize Serial port 0. Serial Monitor is open on Serial port 0
  Serial1.begin(9600);  //Initialize Serial port 1. RX, TX serial communication is open on Serial port 1
  pinMode(ledPin,OUTPUT);  
  pinMode(GREEN_LED,INPUT);
  }
  
  void loop(){  
    if(Serial1.available()>0)  
    {    InChar=Serial1.read();    
    Serial.print(InChar);
    if( InChar == 'H')
  {
    digitalWrite(ledPin, HIGH);
  }
  else if(InChar == 'L')
  {
    digitalWrite(ledPin, LOW);
  }
  delay(1);
  }
}