void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(25, OUTPUT);
  pinMode(18, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int button = digitalRead(18);
  if (button==LOW){
    digitalWrite(25, LOW);
  }
  else{
    digitalWrite(25, HIGH);
  }
  delay(10); // this speeds up the simulation
}