int clockPin = 2; 

int latchPin = 3;  

int dataPin = 4;   

int outputEnablePin = 5;  

byte leds = 0;    

void setup(){

  pinMode(latchPin, OUTPUT);

  pinMode(dataPin, OUTPUT);  

  pinMode(clockPin, OUTPUT);

  pinMode(outputEnablePin, OUTPUT); 

}

void loop() {

  leds = 0B11111111;    

  updateShiftRegister();

  delay(500);

  for (byte b = 255; b > 0; b--){

    analogWrite(outputEnablePin, b);

    delay(10);

  }

}

void updateShiftRegister(){

   digitalWrite(latchPin, LOW);

   shiftOut(dataPin, clockPin, LSBFIRST, leds);

   digitalWrite(latchPin, HIGH);

}