const int ledPin = PA5;

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(115200);
  Serial.println("Send '1' to turn ON LED. Send '0' to turn it OFF.");
}

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

    // Act based on what was received
    switch (receivedChar) {
      case '1':
        digitalWrite(ledPin, HIGH);
        Serial.println("LED turned ON.");
        break;
      case '0':
        digitalWrite(ledPin, LOW);
        Serial.println("LED turned OFF.");
        break;
      default:
        // Echo anything else that is sent
        Serial.print("You sent: '");
        Serial.print(receivedChar);
        Serial.println("' - Not a recognized command.");
        break;
    }
  }
}