byte ledPin = 27;
void setup()
{
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(ledPin,OUTPUT);
}

void loop() 
{
  // put your main code here, to run repeatedly:
  analogWrite(ledPin,3000);
  Serial.println("led on");
  delay(1000); // this speeds up the simulation
  analogWrite(ledPin,0);
  Serial.println("led off");
  delay(1000);
}