In this chapter, you learned a bit about NFC technology and how it can be used as a means to give objects a unique identifier that can be digitally registered. You also learned a bit about servomotors and how they can be used to move things around. The construction part of this project might seem tricky to some and it is but with some patience, I am sure you will get there. The good part is that once you're done with the door, you can have a lot of fun creating new objects to open the door with minimum effort. Instead of hiding a spare key under the doormat or a garden stone, why not make the actual doormat or stone into the key. I bet no one would ever think of trying to open a door with these objects. If you are worried about losing your tags, there are re-programmable tags available, which means you can clone your tags.

In the next chapter, we will stick with wireless communication but we will be switching over to Bluetooth. This gives us a larger range of functions to play around...