Conta enrere

#define pin_a 3
#define pin_b 4
#define pin_c 5
#define pin_d 6
#define pin_e 7
#define pin_f 1
#define pin_g 2

void setup() {
  pinMode(pin_a, OUTPUT);
  pinMode(pin_b, OUTPUT);
  pinMode(pin_c, OUTPUT);
  pinMode(pin_d, OUTPUT);
  pinMode(pin_e, OUTPUT);
  pinMode(pin_f, OUTPUT);
  pinMode(pin_g, OUTPUT);
}

void loop() {
  zero();
  delay(1000);
  un();
  delay(1000);
  dos();
  delay(1000);
  tres();
  delay(1000);
  quatre();
  delay(1000);
  cinc();
  delay(1000);
  sis();
  delay(1000);
  set();
  delay(1000);
  vuit();
  delay(1000);
  nou();
  delay(1000);
}

void zero() {
  digitalWrite(pin_a, HIGH);
  digitalWrite(pin_b, HIGH);
  digitalWrite(pin_c, HIGH);
  digitalWrite(pin_d, HIGH);
  digitalWrite(pin_e, HIGH);
  digitalWrite(pin_f, HIGH);
  digitalWrite(pin_g, LOW);
}

void un() {
  digitalWrite(pin_a, LOW);
  digitalWrite(pin_b, HIGH);
  digitalWrite(pin_c, HIGH);
  digitalWrite(pin_d, LOW);
  digitalWrite(pin_e, LOW);
  digitalWrite(pin_f, LOW);
  digitalWrite(pin_g, LOW);
}

void dos() {
  digitalWrite(pin_a, HIGH);
  digitalWrite(pin_b, HIGH);
  digitalWrite(pin_c, LOW);
  digitalWrite(pin_d, HIGH);
  digitalWrite(pin_e, HIGH);
  digitalWrite(pin_f, LOW);
  digitalWrite(pin_g, HIGH);
}

void tres() {
  digitalWrite(pin_a, HIGH);
  digitalWrite(pin_b, HIGH);
  digitalWrite(pin_c, HIGH);
  digitalWrite(pin_d, HIGH);
  digitalWrite(pin_e, LOW);
  digitalWrite(pin_f, LOW);
  digitalWrite(pin_g, HIGH);
}

void quatre() {
  digitalWrite(pin_a, LOW);
  digitalWrite(pin_b, HIGH);
  digitalWrite(pin_c, HIGH);
  digitalWrite(pin_d, LOW);
  digitalWrite(pin_e, LOW);
  digitalWrite(pin_f, HIGH);
  digitalWrite(pin_g, HIGH);
}

void cinc() {
  digitalWrite(pin_a, HIGH);
  digitalWrite(pin_b, LOW);
  digitalWrite(pin_c, HIGH);
  digitalWrite(pin_d, HIGH);
  digitalWrite(pin_e, LOW);
  digitalWrite(pin_f, HIGH);
  digitalWrite(pin_g, HIGH);
}

void sis() {
  digitalWrite(pin_a, HIGH);
  digitalWrite(pin_b, LOW);
  digitalWrite(pin_c, HIGH);
  digitalWrite(pin_d, HIGH);
  digitalWrite(pin_e, HIGH);
  digitalWrite(pin_f, HIGH);
  digitalWrite(pin_g, HIGH);
}

void set() {
  digitalWrite(pin_a, HIGH);
  digitalWrite(pin_b, HIGH);
  digitalWrite(pin_c, HIGH);
  digitalWrite(pin_d, LOW);
  digitalWrite(pin_e, LOW);
  digitalWrite(pin_f, LOW);
  digitalWrite(pin_g, LOW);
}

void vuit() {
  digitalWrite(pin_a, HIGH);
  digitalWrite(pin_b, HIGH);
  digitalWrite(pin_c, HIGH);
  digitalWrite(pin_d, HIGH);
  digitalWrite(pin_e, HIGH);
  digitalWrite(pin_f, HIGH);
  digitalWrite(pin_g, HIGH);
}

void nou() {
  digitalWrite(pin_a, HIGH);
  digitalWrite(pin_b, HIGH);
  digitalWrite(pin_c, HIGH);
  digitalWrite(pin_d, HIGH);
  digitalWrite(pin_e, LOW);
  digitalWrite(pin_f, HIGH);
  digitalWrite(pin_g, HIGH);
}