#define dataPin 12
#define latchPin 11
#define clockPin 9
byte path[4] = {
  B11000011,
  B00111100,
  B00100100,
  B00011000,
};

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

void loop() {
  for (int i = 0; i < 4; i++){
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, path[i]);
    digitalWrite(latchPin, HIGH);
    delay(250);
  }
  for (int i = 0; i < 4; i++) {
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, path[3 - i]);
    digitalWrite(latchPin, HIGH);
    delay(250);
  }
}