void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  //Serial.println("Hello, ESP32!");
  pinMode(25, OUTPUT);
  pinMode(27, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  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);

}