int a=15;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
 pinMode(12, OUTPUT);;
}

void loop() {
  digitalRead(a);
  for(int i=0;i<a;i++)
  {
    if(i<4)
    {
    tone(12,6000);
  }
  
  else if(i>4 && i<9)
  {
    tone(12,8000);
  }
  else
  {
    noTone(12);
  }
  Serial.println(i);
  delay(1000); 
  }
  // put your main code here, to run repeatedly:
  // this speeds up the simulation
}