void setup() {
  // put your setup code here, to run once:
  pinMode(9, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(9, HIGH);
digitalWrite(2, LOW);
digitalWrite(3, LOW);
  // Zet de ingebouwde LED aan
  digitalWrite(LED_BUILTIN, HIGH);
  
  // Wacht 1000 milliseconden (1 seconde)
  delay(3000);
  
  // Zet de LED op pin 24 uit
  digitalWrite(9, LOW);
  digitalWrite(2, HIGH);
  digitalWrite(3, LOW);
  // Wacht 1000 milliseconden (1 seconde)
  delay(1000);
  digitalWrite(3, HIGH);
  digitalWrite(2, LOW);
  delay(3000);
  // Zet de ingebouwde LED uit
  digitalWrite(LED_BUILTIN, LOW);
}