int data = 0;    // Wiring pin 0 for data 
int clock = 1;   // Wiring pin 1 for clock 
int strobe = 2;  // Wiring pin 2 for the strobe (latch) 
byte counter = 0;

void setup() {
  pinMode(data OUTPUT);
  pinMode(clock, OUTPUT);
  pinMode(strobe, OUTPUT);
}

void loop() { 
  digitalWrite(strobe, LOW);
  // writes counter to the register
  shiftOut(data, clock, LSBFIRST, counter);    
  digitalWrite(strobe, HIGH); 
  delay(1000);
  counter = counter + 1;
}