//CATHODE
byte segValue[10][7] = {
   {1,1,1,1,1,1,0}, //0
   {0,1,1,0,0,0,0}, //1
   {1,1,0,1,1,0,1}, //2
   {1,1,1,1,0,0,1}, //3
   {0,1,1,0,0,1,1}, //4
   {1,0,1,1,0,1,1}, //5
   {1,0,1,1,1,1,1}, //6
   {1,1,1,0,0,0,0}, //7
   {1,1,1,1,1,1,1}, //8
   {1,1,1,1,0,1,1}  //9  
};
byte segPin[7]={0,1,2,3,4,5,6}; 
byte digitPin[2] = {A0,A1}; 

void setup() {
  for (int i = 0; i < 7; i++)   {
    pinMode(segPin[i], OUTPUT);
  }
  for (int i = 0; i < 2; i++)   {
    pinMode(digitPin[i], OUTPUT);
    digitalWrite(digitPin[i], LOW);
  }
}

void loop() {
  for (int i = 0; i < 60; i++)   {
    displayNumber(i);
    delay(1);  }}

void displayNumber(int num) {
  int tens = num % 10;
  int ones = (num / 10) % 10;

  for(int i = 0; i < 100; i++)  {
    segOutput(1, tens);
    segOutput(0, ones);
    delay(1);   }}
 
void segClear(){ 
  for(int i = 0; i < 7; i++)  {
    digitalWrite(segPin[i], LOW);        
  }
}

void segOutput(int digit, int number) { 
  segClear();
  digitalWrite(digitPin[digit], LOW); 
  for(int i = 0; i < 7; i++) {
     digitalWrite(segPin[i], segValue[number][i]);        
  }
  delay(4);
  digitalWrite(digitPin[digit], HIGH); 
}