//explained to students
int aaa=4;
int bbb=14;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(bbb, OUTPUT);
  pinMode(aaa, INPUT_PULLUP);

}

void loop() {
  
int a=digitalRead(aaa);
if(a==1)
{
  digitalWrite(bbb,HIGH);
}
else
{
digitalWrite(bbb, LOW);
}
}