int pinLed = 23; // Pin de la LED

void setup() {
  Serial.begin(19200);
  pinMode(pinLed, OUTPUT);
}

void loop() {
  Serial.print("SESAME :");
  Serial.println(" IOT !");
  
  digitalWrite(pinLed, HIGH); // Allumer la LED
  Serial.println("LED allumée !");
  
  delay(1000);
  
  digitalWrite(pinLed, LOW); // Éteindre la LED
  Serial.println("LED éteinte !");
  
  delay(1000);
}