void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(13, OUTPUT);
  pinMode(25, OUTPUT);
}

void loop() {
  analogWrite(25,255);
  digitalWrite(13, HIGH);
  delay(1000); // this speeds up the simulation
  digitalWrite(13, LOW);
  delay(1000); // this speeds up the simulation 
}