InoLab : Using a Shift Register

int latchPin = 4;
int clockPin = 3;
int dataPin = 2;
 
byte leds[] = {B10101010, B00001111};
 
void setup() 
 
{
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT); 
  pinMode(clockPin, OUTPUT);
}
 
void loop() 
{
  for(int i=0; i<8; i++){
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, 1<<i);
  digitalWrite(latchPin, HIGH);
  delay(500);
  }
}