Arduino Uno

#include <Servo.h>
#include <ArduinoJson.h>

#define FAN_PIN 3
#define LED_PIN 5
#define SERVO_PIN 11

enum msg {
  FAN,
  LED,
  DOOR
};

Servo door;

void setup() {
  pinMode(FAN_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);

  analogWrite(FAN_PIN, 0);
  analogWrite(LED_PIN, 0);

  door.attach(SERVO_PIN);
  closeDoor();
}

void loop() {

}

void serialEvent()
{
  StaticJsonDocument<20> doc;
  deserializeJson(doc, Serial);
  int act = doc["action"];
  switch(act) {
    case FAN: {
      int val = doc["state"];
      analogWrite(FAN_PIN, val);
      break;
    }
     case LED: {
      int val = doc["state"];
      analogWrite(LED_PIN, val);
      break;
     }
     case DOOR: {
      bool val = doc["state"];
      handleDoor(val);
      break;
     }
  }
}

void handleDoor(bool state) {
  if(state) {
    openDoor();
  } else {
    closeDoor();
  }
}

void openDoor() {
  door.write(110);
}

void closeDoor() {
  door.write(70);
}