#define DSpin 2
#define LATCHpin 3
#define CLOCKpin 4

uint8_t pattern[]={0b00000000,0b00000001,0b01010101};


void setup() {
pinMode(DSpin, OUTPUT);
pinMode(LATCHpin, OUTPUT);
pinMode(CLOCKpin, OUTPUT);

digitalWrite(LATCHpin, LOW);

shiftOut(DSpin, CLOCKpin, LSBFIRST, pattern[0]);

digitalWrite(LATCHpin, HIGH);
}

void loop() {
  //striedanie();
  posuvanie();
}

bool a=0;
void striedanie(){
  pattern[2]=pattern[2]*2+a;
  a=!a;
  /*if(pattern==0b10101010)
    pattern=0b01010101;
  else
    pattern=0b10101010;*/
  digitalWrite(LATCHpin, LOW);
  shiftOut(DSpin, CLOCKpin, LSBFIRST, pattern[2]);
  digitalWrite(LATCHpin, HIGH);
  delay(250);
}

void posuvanie(){
  float posun;
  if(pattern[1]==0b10000000){
    posun=0.5;
  }
  else if(pattern[1]==1){
    posun=2;
  }
  pattern[1]*=posun;
  digitalWrite(LATCHpin, LOW);
  shiftOut(DSpin, CLOCKpin, LSBFIRST, pattern[1]);
  digitalWrite(LATCHpin, HIGH);
  delay(250);
}