int pino, numero;
byte mat_num[16][7] = {
  { 1, 1, 1, 1, 1, 1, 0 }, //Digito 0
  { 0, 1, 1, 0, 0, 0, 0 }, //Digito 1
  { 1, 1, 0, 1, 1, 0, 1 }, //Digito 2
  { 1, 1, 1, 1, 0, 0, 1 }, //Digito 3
  { 0, 1, 1, 0, 0, 1, 1 }, //Digito 4
  { 1, 0, 1, 1, 0, 1, 1 }, //Digito 5
  { 1, 0, 1, 1, 1, 1, 1 }, //Digito 6
  { 1, 1, 1, 0, 0, 0, 0 }, //Digito 7
  { 1, 1, 1, 1, 1, 1, 1 }, //Digito 8
  { 1, 1, 1, 0, 0, 1, 1 }, //Digito 9
};
void setup() {
  pinMode(2, OUTPUT); //PINO 2 -> segmento A
  pinMode(3, OUTPUT); //PINO 3 -> segmento B
  pinMode(4, OUTPUT); //PINO 4 -> segmento C
  pinMode(5, OUTPUT); //PINO 5 -> segmento D
  pinMode(6, OUTPUT); //PINO 6 -> segmento E
  pinMode(7, OUTPUT); //PINO 7 -> segmento F
  pinMode(8, OUTPUT); //PINO 8 -> segmento G
  pinMode(9, OUTPUT); //PINO 9 -> segmento PONTO
}
void loop() {
  for (int num = 9; num >= 0; num--) {
    digitalWrite(9, LOW);
    mostra(num);
    delay(1000);
    digitalWrite(9, HIGH);
    mostra(10); // apaga display
    delay(1000);
  }
}
void mostra(int numero) {
  pino = 2;
  for (byte segmentos = 0; segmentos < 7; ++segmentos) {
    digitalWrite(pino, mat_num[numero][segmentos]);
    ++pino;
  }
}