Ok, before we start, I have to say that this is far from the best gimbal project. But I hope this tutorial will at least...
This below is an RFID module that I’ve bought from eBay for very cheap. If you want one as well, check the link below....
Make a bluetooth app and open your door with it and Arduino. Download STL files for free...
This should be a cool and easy project. We will conect a small thin Keypad that I've bought from eBay for less than 70 c...