void setup() {
  // put your setup code here, to run once:
  // Set pin mode
  pinMode(2, OUTPUT); // LED merah
  pinMode(3, OUTPUT); // LED kuning
  pinMode(4, OUTPUT); // LED hijau
}

void loop() {
  // put your main code here, to run repeatedly:
  // LED hijau menyala selama 5s
  digitalWrite(4, HIGH);
  delay(4000);
  digitalWrite(3, HIGH);
  delay(1000);
  digitalWrite(4, LOW);
  digitalWrite(3, HIGH);
  delay(3000);
  digitalWrite(4, LOW);
  digitalWrite(3, LOW);
  digitalWrite(2, HIGH);
  delay(4000);
  digitalWrite(2, LOW);
}