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

void loop() {
  Serial.println("turn on !");
  digitalWrite(25, HIGH);
  delay(3000);
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}