int a=15;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(12, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalRead(a);
  for(int i=0;i<a;i++)
  {
    if(i<4)
    tone(12,1000);
    else if(i>4 && i<9)
    tone(12,5000);
    else
    noTone(12);
    Serial.println(i);
    delay(1000);
  }
   // this speeds up the simulation
}