Did you recently buy an Apple Watch and look for ways to increase its functionality?
With the first project to be described (first uploaded by Lifehacker), you can use your new clock as a remote key for your home or office door.
It was developed by Make, and uses an application to create a 128-bit (RF) radio frequency key.
So in conjunction with an Arduino RF-enabled board you can unlock your door with Apple Watch you.
Construction will cost you about 100 dollar.
With the video and the detailed instructions on the website, its installation will be a game. The Make also uploaded the open source code of the project GitHub. There you will find everything you need.
Watch the video