Low-Cost Multi-point Interactive Whiteboards Using the Wiimote
For some of the interesting projects with WII look at this page
http://www.cs.cmu.edu/~johnny/projects/wii/
Article archive:
Low-Cost Multi-point Interactive Whiteboards Using the Wiimote
Since the Wiimote can track sources of infrared (IR) light, you can track pens that have an IR led in the tip. By pointing a wiimote at a projection screen or LCD display, you can create very low-cost interactive whiteboards or tablet displays. Since the Wiimote can track upto 4 points, up to 4 pens can be used. It also works great with rear-projected displays.
Software
The calibration and mouse cursor emulation software is available for you to download and try yourself. Note: My mouse emulation code isn’t perfect. If any of you are programmers and can get it working with Alias Sketchbook, drop me a line.
1. Connect your wiimote to your PC via Bluetooth. If you don’t know how to do this, you can follow this tutorial. I’ve been told it works with other Bluetooth drivers, but I have not tested them myself. You can report compatibility issues on the SourceForge:WiimoteWhiteboard – Help Forum
2. Download the Wiimote Whiteboard software to the right. Please read the "READ ME.txt" file first! Make sure your wiimote is connected via bluetooth, and then run the ".exe" in the main folder. NOTE: Good placement of the wiimote is key to good tracking. View the README for more info.
Multitouch: The multitouch demos are custom C# DirectX programs. You may download the sample program to the right, but this is provided for developers without support or documentation. The code is built on top of this Wiimote library. Unfortunately, multi-touch capable applications are currently extremely rare. Hopefully, that will change as more developers explore its potential.
Building pens: Here is a simple schematic of the light pen. The LEDs that I use are Vishay TSAL6400s running at 100mA, but lots of other LEDs will work too. You also might be able to jump start your experimentation by retro-fitting a mini keychain light with an IR LED. I’m currently looking into manufacturing and selling IR pens, but this may take several months.
Mac/Linux Versions: Due to personal time contraints, I’ve had to hand off Mac and linux development to other members of the Source Forge Project – Wiimote Whiteboard. Check there if a release has been made. If you are a Mac/Windows/Linux developer, please help spread the love and join the project. A lot of people are waiting to use your software.You can subscribe to updates at my Project Blog [procrastineering.com] .
A visit to this project’s FAQ and Advanced Discussion post may be very englightening. You may also find the official discussion forums for my wiimote projects helpful: WiimoteProject.com
Links to tools
Gokul's Blog 
