Arduino-74HCT164

char CLOCK= 4;
char DATA= 2;

void setup() {
  Serial.begin(9600);
  pinMode(DATA, OUTPUT);
  pinMode(CLOCK, OUTPUT);
}

void rozd(char vstup)
{
  int mask=1;
  int y;
  for(y=0;y<8;y++)
  {
    digitalWrite(CLOCK, HIGH);
    digitalWrite(CLOCK, LOW);
  }
  for(y=0;y<8;y++)
  {
    if((mask&vstup)!=0)
    {
      digitalWrite(DATA, HIGH);
    }
    if((mask&vstup)==0)
    {
      digitalWrite(DATA, LOW);
    }
    digitalWrite(CLOCK, HIGH);
    digitalWrite(CLOCK, LOW);
    mask=mask<<1;
  }
}


void loop() {
  if (Serial.available() > 0) {
    rozd(Serial.parseInt());
  }
}