const int buzzer = 7; //buzzer to arduino pin 7

int tones[2] = {250, 5000};

int tone_sequence[5] {0,0,0,0,0};


void setup(){
  pinMode(buzzer, OUTPUT);
}

void loop(){
  for (int i = 0; i < 5; i++) {
    if (tone_sequence[i] == 0) {
      tone(buzzer, tones[0]);
    } else if (tone_sequence[i] == 1) {
      tone(buzzer, tones[1]);
    }
    delay(1000);
    noTone(buzzer);
    delay(1000);
  }

  for (int i = 0; i < 5; i++) {
    tone_sequence[i] = random(2);
  }
  
  delay(5000);
}