void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(19, OUTPUT);
  pinMode(27, INPUT);
  Serial.println("Hello, ESP32!");
}

void loop() {
  // put your main code here, to run repeatedly:
  int switchcase=digitalRead(27);
  if (switchcase==1){
  digitalWrite(19, HIGH);
  delay(1000);}
  else {
  digitalWrite(19, LOW);
  delay(1000);}
}