// Definisi pin untuk lampu lalu lintas
const int M1 = 2;
const int K1 = 3;
const int H1 = 4;

const int M2 = 5;
const int K2 = 6;
const int H2 = 7;

const int M3 = 8;
const int K3 = 9;
const int H3 = 10;

const int M4 = 11;
const int K4 = 12;
const int H4 = 13;

// Variabel untuk melacak simpang saat ini
int currentIntersection = 1;

// Durasi lampu lalu lintas
const int redDuration = 5000;    // 5 detik
const int yellowDuration = 2000; // 2 detik
const int greenDuration = 5000;  // 5 detik

void setup
()
 {
  // Set pin sebagai output untuk lampu lalu lintas
  pinMode(M1, OUTPUT);
  pinMode(K1, OUTPUT);
  pinMode(H1, OUTPUT);
  
  pinMode(M2, OUTPUT);
  pinMode(K2, OUTPUT);
  pinMode(H2, OUTPUT);
  
  pinMode(M3, OUTPUT);
  pinMode(K3, OUTPUT);
  pinMode(H3, OUTPUT);
  
  pinMode(M4, OUTPUT);
  pinMode(K4, OUTPUT);
  pinMode(H4, OUTPUT);
}
   case 1:
      // Simpang 1: lampu hijau, lainnya merah
      digitalWrite(H2, HIGH);
      digitalWrite(M3, HIGH);
      digitalWrite(M4, HIGH);
      digitalWrite(M5, HIGH);
      delay(greenDuration);
      digitalWrite(H2, LOW);
      digitalWrite(K2, HIGH);
      delay(yellowDuration);
      digitalWrite(K2, LOW);
      digitalWrite(M3, LOW);
      currentIntersection = 2;
      break;
      
    case 2:
      // Simpang 2: lampu hijau, lainnya merah
      digitalWrite(H3, HIGH);
      digitalWrite(M2, HIGH);
      digitalWrite(M4, HIGH);
      digitalWrite(M5, HIGH);
      delay(greenDuration);
      digitalWrite(H3, LOW);
      digitalWrite(K3, HIGH);
      delay(yellowDuration);
      digitalWrite(K3, LOW);
      digitalWrite(M4, LOW);
      currentIntersection = 3;
      break;
      
    case 3:
      // Simpang 3: lampu hijau, lainnya merah
      digitalWrite(H4, HIGH);
      digitalWrite(M2, HIGH);
      digitalWrite(M3, HIGH);
      digitalWrite(M5, HIGH);
      delay(greenDuration);
      digitalWrite(H4, LOW);
      digitalWrite(K4, HIGH);
      delay(yellowDuration);
      digitalWrite(K4, LOW);
      digitalWrite(M5, LOW);
      currentIntersection = 4;
      break;
      
    case 4:
      // Simpang 4: lampu hijau, lainnya merah
      digitalWrite(H5, HIGH);
      digitalWrite(M2, HIGH);
      digitalWrite(M3, HIGH);
      digitalWrite(M4, HIGH);
      delay(greenDuration);
      digitalWrite(H5, LOW);
      digitalWrite(K5, HIGH);
      delay(yellowDuration);
      digitalWrite(K2, LOW);
      digitalWrite(M2, LOW);
      currentIntersection = 1;
      break;
  }
}