#define RED_PIN 3
#define YELLOW_PIN 5
#define GREEN_PIN 4

void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ;
  }
  
  Serial.println("Mulai");

  pinMode(RED_PIN, OUTPUT);
  pinMode(YELLOW_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
}

void loop() {
  digitalWrite(RED_PIN, HIGH);
  Serial.println("Lampu merah menyala");
  delay(50000);
  digitalWrite(RED_PIN, LOW);
  Serial.println("Lampu merah mati");
  
  digitalWrite(YELLOW_PIN, HIGH);
  Serial.println("Lampu kuning menyala");
  delay(20000);
  digitalWrite(YELLOW_PIN, LOW);
  Serial.println("Lampu kuning mati");
  
  digitalWrite(GREEN_PIN, HIGH);
  Serial.println("Lampu hijau menyala");
  delay(20000);
  digitalWrite(GREEN_PIN, LOW);
  Serial.println("Lampu hijau mati");
}