#define FIRST_SEGMENT_PIN   2
#define SEGMENT_COUNT       8

byte numberSegments[10] = {
  0b01110111, 
  0b00010100, 
  0b10110011, 
  0b10110110, 
  0b11010100, 
  0b11100110, 
  0b11101111, 
  0b00110100, 
  0b11110111,
  0b11111110,
};

void setup() {
  for (int i = 0; i < SEGMENT_COUNT; ++i)
  pinMode(i + FIRST_SEGMENT_PIN, OUTPUT);
}

void loop() {
  int number = (millis() / 1000) % 10;
  for (int i = 0; i < SEGMENT_COUNT; ++i) {
    boolean enableSegment = bitRead(numberSegments[number], i);
    digitalWrite(i + FIRST_SEGMENT_PIN, enableSegment);
  }

}