int dice;
int new_dice;
float tempo = 100;
float bounce;

void setup() {
  // put your setup code here, to run once:
  pinMode(0, OUTPUT);
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, INPUT_PULLUP);
  randomSeed(analogRead(PB0));
  //dice = random(1,7);
}

void show_num(int num) {
  switch (num) {
    case 0:
      digitalWrite(0, LOW);
      digitalWrite(1, LOW);
      digitalWrite(2, LOW);
      digitalWrite(3, LOW);
      break;
    case 1:
      digitalWrite(0, LOW);
      digitalWrite(1, LOW);
      digitalWrite(2, LOW);
      digitalWrite(3, HIGH);
      break;
    case 2:
      digitalWrite(0, HIGH);
      digitalWrite(1, LOW);
      digitalWrite(2, LOW);
      digitalWrite(3, LOW);
      break;
    case 3:
      digitalWrite(0, HIGH);
      digitalWrite(1, LOW);
      digitalWrite(2, LOW);
      digitalWrite(3, HIGH);
      break;
    case 4:
      digitalWrite(0, HIGH);
      digitalWrite(1, LOW);
      digitalWrite(2, HIGH);
      digitalWrite(3, LOW);
      break;
    case 5:
      digitalWrite(0, HIGH);
      digitalWrite(1, LOW);
      digitalWrite(2, HIGH);
      digitalWrite(3, HIGH);
      break;
    case 6:
      digitalWrite(0, HIGH);
      digitalWrite(1, HIGH);
      digitalWrite(2, HIGH);
      digitalWrite(3, LOW);
      break;
  }
}

void loop() {
  show_num(0);
  while (digitalRead(4) == HIGH) {};
  new_dice = random(1, 7);
  show_num(new_dice);
   tempo = 100;
   while (tempo < 1000) {
     show_num(dice);
     do {
       new_dice = random(1,7);
     } while (new_dice == dice);
     dice = new_dice;
     delay(tempo);
     bounce = random(110, 140)/100.0;
     tempo *= bounce;
   };
  delay(1000);
}