Firebase setup Guide Click Here to go to Google Firebase Click On Go to console Click On Add Project Enter name for your Project Click On Continue Turn Off Google Analytics and Click On Create Project Click On Continue Click On Authentication Click On Get Started In Sign-in-methods Select Email/Password Enable Email/Password and Click On Save Go to users and Click On Add User Add Dummy Email and Password Credentials and Click On Add User and Copy it in Notepad Click On Realtime Database Click On Create Database Click On Next Select Start in Test Mode and Click On Enable Click On Add Child Enter Name as 'led' and Value as '0' and Click On Add Now Copy the Database URL and Paste it in Notepad Click On Project Overview and Select Project Settings In General Copy the Web API Key and Paste it in Notepad At the end of these Steps you should have these Four Credentials Now Replace these four Credentials in your Code in Arduino IDE Enter Your SSID and Password and Upload the Code