Hello,

I learned about this whole wii whiteboard idea just a little while ago and have been busy trying to make an IR pen ever since.  I first made a normal push-button pen and was excited to try it out.  I discovered that it was very difficult to write/print quickly with it (and my wife was absolutely disastrous at it).  So I tried to make a pressure sensitive pen.  The pressure sensitive pen is SO much easier to write quickly with (I am a teacher and am hoping to use this as a whiteboard in the classroom).  This pen is also very sensitive - ie. you don't have to press hard at all, and it feels very much like writing with an actual whiteboard marker on a whiteboard.

This website has been so helpful in guiding me, I thought I would contribute what I came up with.
The key to my pressure sensitive pen is a stain remover pen (Tide-To-Go) which already comes with pressure sensitive tip.  I've included a diagram with some comments.

Hi all,
This looks like a great way to get pressure sensitive pens. Here's a link for the pen.

http://housekeeping.about.com/od/productreviews/gr/tidetogo.htm

I'll give it a go and let you know.

Cheers,
Joe

I made one; however, my spring and "switch" are between the LED and battery



Does not work great for writing.

more:
http://www.wiimoteproject.com/wiimote-interactive-learning-and-pedagodgy-discussion/my-wiimote-interactive-whiteboard-setup/

I accidentally broke off the chalky tip. I'm not sure if that is the reason why, but: I cannot seem to remove the "important part" from the tip of the pen. I've tried twisting, pulling, and then pushing the remaining chalky tip down, nothing has worked. I had to stop pulling when squeezing on it with the pliers felt like i might break something. Am I just being stupid?

Not at all.  The Tide to Go pen body will fit a AAA battery quite nicely.  In fact even the tide to go mini pens will just fit a AAA.  I just think that a AA battery would be better, which doesn't fit in the pen body.