The Raspberry Pi makes a great brain for your smart home, and to show off just how much you can do with it, DIYer Frederick Vandenbosch demonstrates a ton of different tools he built for himself. Vandenbosch's setup is a winner of Element 14's "IoT Smarter Spaces" contest and it's pretty clear why. It's not only polished and wonderfully crammed inside custom wood cases, it's also extremely useful. The system here does quite a bit. It tracks who's home with a key station, includes a voice-controlled clock that can also track a variety of sensors and cameras throughout the house and also packs in a handy touchscreen for everything. There's a lot going on here, but you can see Vandenbosch's full list over at Element 14. It's set up in a way where you can pick and choose which parts of the project might be useful for you and which ones you might want to just skip.
Pi IoT [Element 14]