byte dataPin = 2;
byte clockPin = 3;
byte latchPin = 4;

uint8_t data = 0xAA;


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

  Serial.begin(115200);

  //digitalWrite(dataPin, HIGH);

  while (Serial.available() == 0) {}
}

void loop()
{
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, data);
  digitalWrite(latchPin, HIGH);

  delay(1000);
  data++;
}