bool _door1_state,_door2_state;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(2, INPUT_PULLUP);
  _door1_state=digitalRead(2);
  pinMode(4, INPUT_PULLUP);
  _door2_state=digitalRead(4);
  pinMode(5, OUTPUT);
  digitalWrite(5,LOW);
  pinMode(18, OUTPUT);
  digitalWrite(18, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(2)==0 && _door1_state!=0) {
    Serial.println("D2 low");
  }
  _door1_state=digitalRead(2);
  digitalWrite(5,!_door1_state);
  
  if (digitalRead(4)==0 && _door2_state!=0) {
    Serial.println("D4 low");
  }
  _door2_state=digitalRead(4);
  digitalWrite(18,!_door2_state);
  delay(10); // this speeds up the simulation
}