I came a cross something a while back that is really quite ingenious. To make this whiteboard, the main things you need are:
- A computer with bluetooth capabilities
- A Wii Remote Control
- A couple of small electronics (led, battery, wire, bic pen) available for a couple of bucks from Radio Shack.
- Recommended: (computer projector screen).
Johnny Lee provides the software to make it all work for free. See the Video for a demonstration:

I am an Assistant Principal in a Middle School. We are located in Crowley, Louisiana. I work in a low performing middle school. Our funds are very limited. I am familiar with the interactive white boards and through some grant awards, I have been fortunate to secure several for math teachers at a former school. I was so excited to see your video and how ingeniously you have adapted affordable materials to assist teachers. Thank you for sharing your invention. I have shared it with the more tech savvy teachers at my school. We may contact you as they attempt to construct the device. Thank you again. Teresa Chance