byte segValue[10][7] = {
  {0, 0, 0, 0, 0, 0, 1}, 
  {1, 0, 0, 1, 1, 1, 1}, 
  {0, 0, 1, 0, 0, 1, 0}, 
  {0, 0, 0, 0, 1, 1, 0}, 
  {1, 0, 0, 1, 1, 0, 0}, 
  {0, 1, 0, 0, 1, 0, 0}, 
  {0, 1, 0, 0, 0, 0, 0}, 
  {0, 0, 0, 1, 1, 1, 1}, 
  {0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 1, 0, 0}  
};

byte segPin[7] = {8, 12, 3, 5, 6, 9, 2}; 
byte digitPin[3] = {7, 10, 11};         

void setup() {
  for (int i = 0; i < 7; i++) {
    pinMode(segPin[i], OUTPUT);
    digitalWrite(segPin[i], HIGH); 
  }

  for (int i = 0; i < 3; i++) {
    pinMode(digitPin[i], OUTPUT);
    digitalWrite(digitPin[i], LOW); 
  }
}

void loop() {
  for (int i = 0; i < 2500; i++) {
    display_N(i);
    delay(95); 
  }
}

void display_N(int num) {
  int units = num % 10;
  int tens = (num / 10) % 10;
  int hundreds = (num / 100) % 10;

  segOutput(2, units);   
  segOutput(1, tens);    
  segOutput(0, hundreds); 
}

void segClear() {
  for (int i = 0; i < 7; i++) {
    digitalWrite(segPin[i], HIGH);
  }
}

void segOutput(int d, int Number) {
  segClear(); 
  digitalWrite(digitPin[d], HIGH); 

  for (int i = 0; i < 7; i++) {
    digitalWrite(segPin[i], segValue[Number][i]);
  }

  delay(1); 

  digitalWrite(digitPin[d], LOW); 
}