Building a Cheap Multi-Touch Whiteboard using a WiiMote and a Projector

Yet another cool thing to do with a WiiMote: Build an electronic multi-touch whiteboard.

The WiiMote includes an infrared camera which can be used to track points which reflect infrared light. Johnny Chung Lee used this feature to work with self-made infrared pens on various surfaces (primarily projections):

The descriptions sounds as if it should be relatively easy (and cheap) to build something like that yourself. All necessary software is available on Johnny’s website.

(via via Fefe)