void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(2,OUTPUT);
  pinMode(13,INPUT);
}

void loop() {
  int state=digitalRead(13);
  if(state==HIGH){
    digitalWrite(2,HIGH);
    Serial.println("led is on");
  }
  else{
    digitalWrite(2,LOW);
    Serial.println("led is off");
  }
}