const int segment1Pin[7] = {D2,D3,D4,D5,D6,D7,D8};
const byte digitCode[10] = {
  0b00111111,
  0b00000110,
  0b01011011,
  0b01001111,
  0b01100110,
  0b01101101,
  0b01111101,
  0b00000111,
  0b01111111,
  0b01101111,
};
void setup() {
  for(int i=0;i<7;i++){
    pinMode(segment1Pin[i],OUTPUT);
  }
}

void loop() {
  static int number = 0;
  int tens = number/10;
  int units = number%10;
  byte code1 = digitCode[tens];
  byte code2 = digitCode[units];
  for(int i=0; i<7; i++){
    digitalWrite(segment1Pin[i],(code1 >> i) & 0X01);
  }
  delay(500);
  number = (number+1)%100;
}