void setup() {
  pinMode(4, INPUT_PULLUP); // manual
  pinMode(16, INPUT_PULLUP); // auto
  pinMode(2, OUTPUT);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}
int time_end=0;
bool toggle =true,onclick = false;
void loop() {
  if(millis() - time_end >= 1000)
  {
    time_end = millis();
    if(digitalRead(16) == LOW)
    {
      Serial.println("Auto mode led will blink 1s");
       digitalWrite(2,toggle);
    }
    else if(digitalRead(4) == LOW)
    {
      
      Serial.println("Manual mode");
      if(onclick)
      {
        onclick = false;
        Serial.println("light off");
      }
      else
      {
        onclick = true;
        Serial.println("light on");
      }
      digitalWrite(2,onclick);
    }

    toggle = !toggle;
  }
  delay(10); // this speeds up the simulation
}