const int INPUT_PIN = 2;  
const int CLOCK_PIN = 3; 
const int STORAGE_PIN = 4; 

void setup() {
  pinMode(INPUT_PIN, OUTPUT);
  pinMode(CLOCK_PIN, OUTPUT);
  pinMode(STORAGE_PIN, OUTPUT);
}

void loop() {
  for (int i = 0; i < 8; i++) {
    digitalWrite(STORAGE_PIN, LOW);
    byte ledState = 1 << (7 - i); //0b10000000 = 128
    shiftOut(INPUT_PIN, CLOCK_PIN, MSBFIRST, ledState);
    digitalWrite(STORAGE_PIN, HIGH);
    delay(300);
  }
}