#define BUZZER_PIN 9
#define BTN_PIN 10

byte leds[] = {2,3,4,5,6,7,8};
byte numbers[6][7] = {
  {0,0,0,1,0,0,0},
  {1,0,0,0,0,0,1},
  {1,0,0,1,0,0,1},
  {1,1,0,0,0,1,1},
  {1,1,0,1,0,1,1},
  {1,1,1,0,1,1,1},
};

void showNumber(byte number);

void setup() {
  randomSeed(analogRead(0));
  pinMode(BTN_PIN, INPUT_PULLUP);

  for(byte i=0; i<7; i++)
  {
    pinMode(leds[i], OUTPUT);  
    digitalWrite(leds[i], LOW);
  }

  showNumber(0);
}

void showNumber(byte num_idx) {
  for(byte led = 0; led < 7; led ++)
  {
    if(numbers[num_idx][led])
    {
       digitalWrite(leds[led], HIGH);
    } else {
       digitalWrite(leds[led], LOW);
    }
  }
}


void showRandomNumber() {
  byte last_num = 100;
  byte num = 100;

  for(byte i=0;i<20; i++ )
  {
     tone(BUZZER_PIN, 500, 10);
     do {
        num = random(0, 6);
     } while (num == last_num);
     last_num = num;
    
     showNumber(num);
     delay(150 + ( i* 30));     
  }
  // showNumber(random(0, 6));
}

void playSuccessSound() {
  tone(BUZZER_PIN, 523, 100); delay(100); // C5
  tone(BUZZER_PIN, 659, 100); delay(100); // E5
  tone(BUZZER_PIN, 784, 100); delay(100); // G5
  tone(BUZZER_PIN, 1047, 300); delay(300); // C6
}

void loop() {
  while(digitalRead(BTN_PIN) == HIGH);
  tone(BUZZER_PIN, 440, 200);  
  showRandomNumber();
  playSuccessSound();
}