int buzzer = 26;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  noTone(buzzer);
  int i =0;
  for(i=1;i<=5;i++)
  {
    Serial.println(i);
    tone(buzzer,1000);
    delay(1000);
  }
    for(i=6;i<=10;i++)
  {
    Serial.println(i);
    tone(buzzer,5000);
    delay(1000);
  }
    for(i=11;i<=15;i++)
  {
    Serial.println(i);
    tone(buzzer,0);
    delay(1000);
  }
    for(i=16;i<=20;i++)
  {
    Serial.println(i);
    tone(buzzer,10000);
    delay(1000);
  }
  
  delay(1000); // this speeds up the simulation
}