Voice-controlled lighting and power for around $100

Everyone who's seen Iron Man is familiar with Tony Stark's AI assistant Jarvis, which listens and responds as a human would to Tony Stark's verbal commands. While such an assistant may seem inaccessible to all but the billionaire mechanical genius, I'm writing this to show you how to make a Jarvis assistant to control lights and do useful things.

I'm still working on rewriting this post with all the improvements I made to Jarvis since version 1.