Via Hack a day:
Johnny Lee’s back again with his Wiimote interactive whiteboard. Commercial versions of these things are expensive and heavy. His technique doesn’t even need a projector, just a computer, a Wiimote and a simple IR emitting pen. The pen is just a stylus with an infrared LED in the tip.
Johnny Lee is back again indeed I posted about his method to track your fingers using a Wiimote earlier. This time he uses a the Wiimote’s infrared camera to track light pens (pens that emit an infrared light at the tip) on a surface to create an interactive whiteboard. It’s really nice that he can use any surface. You could use a projector in combination with an ordinary projection screen, a wall or a desk. If you don’t have a projector, you could turn any LCD display into a tablet surface.
Since the Wiimote can track up to four different points, these surfaces are also multi-touch. This means you can have multi-touch interaction on any projected image. It would be interesting to combine this with a steerable projector system.
The source code is available. I will definitely keep an eye on his Wii projects page.