This game of Space Invaders is played by tilting your iPhone to the left or right. Itís a demonstration of HTML5 used to link devices in-browser. The only setup thatís required is for the base device to load up a webpage, then the control device scans a QR code (or just types in a link) to connect with the game. You can give it a try right now if you want.
It only works with iOS devices but we believe thatís because mobile Safari has the ability to poll accelerometer data and other browsers do not. If this was using on-screen buttons rather than the tilt controls it would work on any device that implements HTML5. The connection is facilitated by Node.js and Socket.IO. The QR code that is generated by the host machineís page includes a unique ID which allows the control device to link with it. Once loaded, commands from the controller are sent via Socket.IO to the node on the host machine.
As with this HTML5-based sensor data application, we think this method is important because it allows control without the need for a standalone application. Weíre hoping to see a lot of this in embedded projects in the future. By serving data to a smart phone or other device you remove to need for a physical user interface in your projects, which means you can make great things while spending less.

http://hackaday.com/2012/03/26/accel...tesy-of-html5/