// Bagian satu
#define Green1 1
#define Yellow1 2
#define Red1 3

// bagian 2
#define Green2 4
#define Yellow2 5
#define Red2 6

// bagian 3
#define Green3 7
#define Yellow3 8
#define Red3 9

//bagian 4
#define Green4 10
#define Yellow4 11
#define Red4 12

void setup() {
  pinMode(Green1, OUTPUT);
  pinMode(Yellow1, OUTPUT);
  pinMode(Red1, OUTPUT);

  pinMode(Green2, OUTPUT);
  pinMode(Yellow2, OUTPUT);
  pinMode(Red2, OUTPUT);

  pinMode(Green3, OUTPUT);
  pinMode(Yellow3, OUTPUT);
  pinMode(Red3, OUTPUT);

  pinMode(Green4, OUTPUT);
  pinMode(Yellow4, OUTPUT);
  pinMode(Red4, OUTPUT);
}

void loop() {
  digitalWrite(Green1, HIGH);
  delay(1000);
  digitalWrite(Yellow1, LOW);
  delay(1000);
  digitalWrite(Red1, LOW);
  delay(1000);
}