// Define an integer variable for the pin number
int UM = 1; // Utara Merah (North Red)
int UK = 2; // Utara Kuning (North Yellow)
int UH = 3; // Utara Hijau (North Green)
int TM = 4; // Timur Merah (East Red)
int TK = 5; // Timur Kuning (East Yellow)
int TH = 6; // Timur Hijau (East Green)

// Create an array to easily iterate over pins
int pin[] = {UM, UK, UH, TM, TK, TH};

void setup()
{
    // Set all pins as OUTPUT in the setup
    // i equals zero
    // i is less than zero
    // and i increment for automatic increase value
    for (int i = 0; i < 5; i++)
    {
        pinMode(pin[i], OUTPUT);
    }
}

void loop()
{
    // First pattern: North Green, East Red
    digitalWrite(UM, LOW);
    digitalWrite(UK, LOW);
    digitalWrite(UH, HIGH);
    digitalWrite(TM, HIGH);
    digitalWrite(TK, LOW);
    digitalWrite(TH, LOW);
    delay(4000);

    // Second pattern: North Yellow, East Yellow
    digitalWrite(UM, LOW);
    digitalWrite(UK, HIGH);
    digitalWrite(UH, LOW);
    digitalWrite(TM, LOW);
    digitalWrite(TK, HIGH);
    digitalWrite(TH, LOW);
    delay(1000);

    // Third pattern: North Red, East Green
    digitalWrite(UM, HIGH);
    digitalWrite(UK, LOW);
    digitalWrite(UH, LOW);
    digitalWrite(TM, LOW);
    digitalWrite(TK, LOW);
    digitalWrite(TH, HIGH);
    delay(4000);

    // Fourth pattern: North Yellow, East Yellow
    digitalWrite(UM, LOW);
    digitalWrite(UK, HIGH);
    digitalWrite(UH, LOW);
    digitalWrite(TM, LOW);
    digitalWrite(TK, HIGH);
    digitalWrite(TH, LOW);
    delay(1000);
}