int val;
int button = 2;
bool sw = true;
int cnt1 = 1;
int cnt2 = 1;
int cnt3 = 1;
int cnt4 = 1;
byte da_pin = 3;
//Note: use the GET diget in order to choose the specific number in the code. Look at the GET digit homework for more info.

void setup() {
  Serial.begin(9600);
  pinMode(button, INPUT_PULLUP);

}

void loop() {
  val = analogRead(A0);
  if (digitalRead(button) == LOW) {
    folder_play(50, cnt1);
    delay(1000);

    folder_play(50, cnt2);
    delay(1000);

    folder_play(50, cnt3);
    delay(1000);

    folder_play(50, cnt4);
    delay(1000);
  }
  while (sw == true) {
    analogRead(A0);
    Serial.println(A0);
    //Here, I don't know how to connect the cnt's to the A0 (petentiomiter)
    delay(300);
    if (analogRead(A0)) {
      cnt1++;
      if (cnt1 > 10) {
        cnt1 = 1;
      }
      cnt2++;
      if (cnt2 > 10) {
        cnt2 = 1;
      }
      cnt3++;
      if (cnt3 > 10) {
        cnt3 = 1;
      }
      cnt4++;
      if (cnt4 > 10) {
        cnt4 = 1;
      }
    }
    if (digitalRead(button) == LOW) {
      break;
    }
  }

}

void send_1() {
  digitalWrite(da_pin, HIGH);
  delayMicroseconds(100);
}

void send_0() {
  digitalWrite(da_pin, LOW);
  delayMicroseconds(100);
}

void send_da(uint8_t data) {
  digitalWrite(da_pin, LOW);
  delayMicroseconds(100);
  //Start mark
  for (byte i = 0; i < 8; i++) { //sending 8 digits
    if (bitRead(data, i) == 0) {
      send_0();
    }
    else {
      send_1();
    }
  }
  digitalWrite(da_pin, HIGH);
  delayMicroseconds(100);
  //End mark
}

void folder_play(byte a, byte b) {
  byte mp3[8] = {126, 255, 6, 15, (byte)0, a, b, 239};
  for (byte i = 0; i < 8; i++) {
    send_da(mp3[i]);
  }
  delay(1);
}