#define dataPin 10
#define latchPin 11
#define clockPin 12
byte byteToSend = 0;

void setup() {
  pinMode(dataPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
}

void loop() {
  for(int i = 0; i < 8; i++){
    byteToSend = 0;
    bitWrite(byteToSend, i, HIGH);
    shift();
  }
}
void shift(){
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, byteToSend);
  digitalWrite(latchPin, HIGH);
  delay(1000);
}