// by Whitney O'Reardon
// June 2021

const int LED = 8;
const int nodeID = 1;
int ID_message;
char message;

void setup()
{
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
}

void loop()
{
  if (Serial.available() > 0) {
    // store numeric values as int
    ID_message = Serial.parseInt();
    // check if serial message was directed for this node
    if (ID_message == nodeID) {

      // read the rest of serial data after parseInt()
      message = Serial.read();
      // turn LED on or off based on the message
      if (message == 'H') {
        digitalWrite(LED, HIGH);
        delay(10);
      } else {  // message == 'L'
        digitalWrite(LED, LOW);
        delay(1);
      }
    }
  }
}