const int pinA = D2;
const int pinB = D3;
const int pinC = D4;
const int pinD = D5;
const int pinE = D6;
const int pinF = D7;
const int pinG = D8;

const int buttonPin = D10;

const unsigned long debounceDelay = 50;

void clearDisplay() {
  digitalWrite(pinA, HIGH);
  digitalWrite(pinB, HIGH);
  digitalWrite(pinC, HIGH);
  digitalWrite(pinD, HIGH);
  digitalWrite(pinE, HIGH);
  digitalWrite(pinF, HIGH);
  digitalWrite(pinG, HIGH);
}

void showNumber(int n) {
  clearDisplay();
  switch (n) {
    case 1:
      digitalWrite(pinB, LOW);
      digitalWrite(pinC, LOW);
      break;
    case 2:
      digitalWrite(pinA, LOW);
      digitalWrite(pinB, LOW);
      digitalWrite(pinG, LOW);
      digitalWrite(pinE, LOW);
      digitalWrite(pinD, LOW);
      break;
    case 3:
      digitalWrite(pinA, LOW);
      digitalWrite(pinB, LOW);
      digitalWrite(pinG, LOW);
      digitalWrite(pinC, LOW);
      digitalWrite(pinD, LOW);
      break;
    case 4:
      digitalWrite(pinF, LOW);
      digitalWrite(pinG, LOW);
      digitalWrite(pinB, LOW);
      digitalWrite(pinC, LOW);
      break;
    case 5:
      digitalWrite(pinA, LOW);
      digitalWrite(pinF, LOW);
      digitalWrite(pinG, LOW);
      digitalWrite(pinC, LOW);
      digitalWrite(pinD, LOW);
      break;
    case 6:
      digitalWrite(pinA, LOW);
      digitalWrite(pinF, LOW);
      digitalWrite(pinE, LOW);
      digitalWrite(pinD, LOW);
      digitalWrite(pinC, LOW);
      digitalWrite(pinG, LOW);
      break;
    default:
      // nada
      break;
  }
}

void setup() {
 
  pinMode(pinA, INPUT_PULLUP);
  pinMode(pinB, INPUT_PULLUP);
  pinMode(pinC, INPUT_PULLUP);
  pinMode(pinD, INPUT_PULLUP);
  pinMode(pinE, INPUT_PULLUP);
  pinMode(pinF, INPUT_PULLUP);
  pinMode(pinG, INPUT_PULLUP);

  pinMode(pinA, OUTPUT); digitalWrite(pinA, HIGH);
  pinMode(pinB, OUTPUT); digitalWrite(pinB, HIGH);
  pinMode(pinC, OUTPUT); digitalWrite(pinC, HIGH);
  pinMode(pinD, OUTPUT); digitalWrite(pinD, HIGH);
  pinMode(pinE, OUTPUT); digitalWrite(pinE, HIGH);
  pinMode(pinF, OUTPUT); digitalWrite(pinF, HIGH);
  pinMode(pinG, OUTPUT); digitalWrite(pinG, HIGH);

  pinMode(buttonPin, INPUT_PULLUP);

  randomSeed(analogRead(A0) ^ micros());

  clearDisplay();
}

void loop() {
  static int lastButtonState = HIGH;
  static unsigned long lastDebounceTime = 0;

  int reading = digitalRead(buttonPin);

  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading == LOW) {
      int numero = random(1, 7);

      showNumber(numero);

      while (digitalRead(buttonPin) == LOW) {
        delay(10);
      }

      delay(100);

    }
  }

  lastButtonState = reading;
}