Seb Lee-Delisle is a digital artist who decided to bring some Internet of Things magic to his Christmas decorations. He’s taken a Raspberry Pi and some addressable fairy lights and rigged up an alphabet display on his wall (see below for a demo).
You login to the web interface (see the top of this blog post) and then click on the letters shown to activate the real-life lights in his home. It’s very neat and he’s written the whole thing up as a tutorial so if you want to have your own wall of letter lights, you can! Go here to read the tutorial.