int pinData = 0;
int pinClock = 2;
int pinLatch = 4;
byte data = 0b11111111;
void setup() {
  // put your setup code here, to run once:
  pinMode(pinData , OUTPUT);
  pinMode(pinClock , OUTPUT);
  pinMode(pinLatch , OUTPUT);
  digitalWrite(pinLatch , LOW);
  shiftOut(pinData , pinClock , MSBFIRST , data);
  digitalWrite(pinLatch, HIGH);
}

void loop() {
  // put your main code here, to run repeatedly:
}