"Any application that can be written in JavaScript will eventually be written in JavaScript" - Atwoods Law Have you ever wanted to control devices in your own home over the internet? I will show you how you can do this with the help of Arduino and JavaScript. Arduino is an open-source microcontroller that can connect to various sensors and affect it's surroundings by controlling lights, LCD screens, motors and other actuators. Johnny-five is a JavaScript library that can communicate with an Arduino using node.js. This opens doors for new possibilities, like integrating with Windows Azure or Firebase. I will introduce Arduino and johhny-five and show you how these two in conjunction can get you started with "The Internet of things". Furthermore I will demonstrate how Arduino combined with various web technologies let's you build awesome home automation systems.