int latchPin = 5;

int clockPin = 6;

int dataPin = 4;

byte leds = 0;

void setup() 

{

  pinMode(latchPin, OUTPUT);

  pinMode(dataPin, OUTPUT);  

  pinMode(clockPin, OUTPUT);

}

void loop() 

{

  leds = 0;

  registeraYaz();

  delay(500);

  for (int i = 0; i < 8; i++)

  {

    bitSet(leds, i);

    registeraYaz();

    delay(500);

  }

  for (int i = 8; i >= 0; i--)

{

    bitClear(leds, i);

    registeraYaz();

    delay(500);

  }

}

void registeraYaz()

{

   digitalWrite(latchPin, LOW);

   shiftOut(dataPin, clockPin, LSBFIRST, leds);

   digitalWrite(latchPin, HIGH);

}