void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
pinMode(25, OUTPUT);
pinMode(27, OUTPUT);
pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(25, HIGH);
  delay(500);
   digitalWrite(25, LOW);
  delay(500);
   digitalWrite(27, HIGH);
  delay(500);
   digitalWrite(27, LOW);
  delay(500);
   digitalWrite(13, HIGH);
  delay(500);
   digitalWrite(13, LOW);
  delay(500);
  
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}