void setup() {
  Serial.begin(115200);
  pinMode(A0, INPUT);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(5, INPUT_PULLUP);
}

void loop() {
  int value = analogRead(A0);
  digitalWrite(LED_BUILTIN, digitalRead((5)));
  value=digitalRead(LED_BUILTIN);
  Serial.println(value);
  delay(100);
}