#define LED_PIN 13 // Define the pin connected to the LED (built-in LED is typically connected to pin 13)

char command; // Variable to store incoming command from Python

void setup() {
  pinMode(LED_PIN, OUTPUT); // Set the LED pin as an output
  Serial.begin(9600); // Initialize serial communication at 9600 baud rate
}

void loop() {
  if (Serial.available() > 0) { // Check if data is available to read
    command = Serial.read(); // Read the incoming command
    
    if (command == 'a') { // If command is 'a' (turn on LED)
      digitalWrite(LED_PIN, HIGH); // Turn on the LED
      Serial.println("LED turned on"); // Send confirmation message back to Python
    }
    else if (command == 'b') { // If command is 'b' (turn off LED)
      digitalWrite(LED_PIN, LOW); // Turn off the LED
      Serial.println("LED turned off"); // Send confirmation message back to Python
    }
  }
}