We have all see some complex home automation systems, this video made by Jeremy from The Custom Geek gives a good overview of what is involved behind the scenes. This system lives in the garage and interfaces audio, video, phone, intercom, lighting and alarm system. Since the system is all connected it can do things like mute your pounding music when the door bell rings. Jeremy is also making custom hardware like this RGBW LED Controller to add to the capabilities of automation systems.