I want to make an automatic humidifier but i am a newbie in arduino

@hungg562002, your topic has been moved to a more suitable location on the forum. Introductory Tutorials is for tutorials that e.g. you write, not for questions. Feel free to write a tutorial once you have solved your problem :wink:

You will probably not need the the Uno, just an ESP8266 (e.g. Wemos D1 mini).