Running LED Knight Rider using Arduino

 Schematic

 The code:

int ledPins[] = {13, 12, 11, 10, 9, 8, 7, 6,5,4};

int numLEDs = sizeof(ledPins) / sizeof(ledPins[0]);

int delayTime = 80; // Waktu tunda dalam milidetik

void setup() {

  for (int i = 0; i < numLEDs; i++) {

    pinMode(ledPins[i], OUTPUT);

  }

}

void loop() {

  for (int i = 0; i < numLEDs; i++) {

    digitalWrite(ledPins[i], HIGH);

    delay(delayTime);

    digitalWrite(ledPins[i], LOW);

  }

  for (int i = numLEDs - 1; i >= 0; i--) {

    digitalWrite(ledPins[i], HIGH);

    delay(delayTime);

    digitalWrite(ledPins[i], LOW);

  }

}