byte getSegments(int value){
  switch (value){
    case 1: return 0b00001100;
    case 0: return 0b01111110;
    case 2: return 0b10110110;
    case 3: return 0b10011110;
    case 4: return 0b11001100;
    case 5: return 0b11011010;
    case 6: return 0b11111010;
    case 7: return 0b00001110;
    case 8: return 0b11111110;
    case 9: return 0b11011110;
    case 10: return 0b11101110;
    case 11: return 0b11111000;
    case 12: return 0b01110010;
    case 13: return 0b10111100;
    case 14: return 0b11110010;
    case 15: return 0b11100010;
  }
}

void setup() {
  for (int i = 1; i <= 7; i++){
    pinMode(i, OUTPUT);
  }
}

void loop() {
  for (int i=0; i<8; i++){
  // byte zero = getSegments(0);
  // PORTD = getSegments(i) ^0b11111111;
  PORTD = 0b00000001 << i^0b11111111;
  delay(500);
  }
}