unsigned long changeTime;
int timeDelay = 200;
int ones, tens = 0;
void setup()
{
  // Serial.begin(115200);
  pinMode(A1, INPUT);
  for (int i = 0; i <= 13; i++)
    pinMode(i, OUTPUT); //all pins Output
    display_ones(0);
    display_tens(0); 
    delay(300);
  
}
//array of digits  from 0 to 9
const int number[11] = {
0b00000001,
0b11001111,
0b10010010,
0b0000110,
0b11001100,
0b0100100,
0b0100000,
0b0001111,
0b00000000,
0b00000100
};
int potenci = 0;
void loop(){
  
  if ((millis() - changeTime) > timeDelay) {
    potenci = map(analogRead(A1), 1, 1024, 1 , 100);
    // Serial.println(potenci);
    ones = potenci % 10;
    tens = potenci / 10;
    display_ones(ones);
    display_tens(tens);
    changeTime = millis();
  }
}

void display_tens(const int tens){
  int pin1, a; //    
  for (pin1 = 0, a = 0; pin1 < 7; pin1++, a++) {
    digitalWrite(pin1, bitRead(number[tens], a));
  }
}

void display_ones(const int ones){
  int pin2, b;             
  for (pin2 = 7, b = 0; pin2 <= 13; pin2++, b++)  {
    digitalWrite(pin2, bitRead(number[ones], b));
  }
}