const int ledPin = 13;  // Use the built-in LED

void setup() {
  pinMode(ledPin, OUTPUT);   // Initialize the LED pin as output
  Serial.begin(115200);      // Initialize serial communication

  // Print instructions to the Serial Monitor
  Serial.println("LED Control Commands:");
  Serial.println("  1 - Turn LED ON");
  Serial.println("  2 - Turn LED OFF");
  Serial.println("  3 - Blink LED 5 times");
  Serial.println("  ? - Print this menu again");
  Serial.println();
}

void loop() {
  // Check if data is available to read from the Serial Monitor
  if (Serial.available() > 0) {
    char command = Serial.read(); // Read the incoming byte

    // Use a switch statement to decide what to do based on the character received
    switch (command) {
      case '1': 
        digitalWrite(ledPin, HIGH);
        Serial.println("Command: LED turned ON");
        break;

      case '2':
        digitalWrite(ledPin, LOW);
        Serial.println("Command: LED turned OFF");
        break;

      case '3':
        Serial.println("Command: Blinking 5 times...");
        for (int i = 0; i < 5; i++) {
          digitalWrite(ledPin, HIGH);
          delay(250);
          digitalWrite(ledPin, LOW);
          delay(250);
        }
        Serial.println("Finished blinking!");
        break;

      case '?':
        // It's good practice to reprint the menu if the user is lost
        Serial.println("Commands: 1 (ON), 2 (OFF), 3 (BLINK), ? (HELP)");
        break;

      default:
        // This runs if the command doesn't match any case
        Serial.println("Send '?' for help.");
        break;
    }
  }
}