byte pin [] = {15, 2, 4, 5, 18, 19, 21};
const byte  count [10] = {

  B00111111,
  B00000110,
  B01011011,
  B01001111,
  B01100110,
  B01101101,
  B01111101,
  B00000111,
  B01111111,
  B01101111,
};
void setup(){

  pinMode(pin[0], OUTPUT);
  pinMode(pin[1], OUTPUT);
  pinMode(pin[2], OUTPUT);
  pinMode(pin[3], OUTPUT);
  pinMode(pin[4], OUTPUT);
  pinMode(pin[5], OUTPUT);
  pinMode(pin[6], OUTPUT);
}

void loop(){
for (int i= 0; i<11;i++){
  SevenSeg(count[i]);
  delay(1000);
}
}
void SevenSeg(byte Bit){
for (int i=0; i<8;i++)
digitalWrite(pin[i],bitRead(Bit,i));

}