infrared

Even before finishing my own infrared led touch screen, but after trying other screens and tables built with the same kind of technology, Luis came up with very valuable information: 4 Infrared lasers provided with special line generators, and placed in the corners of the screen can substitute the endless rows of leds and the soldering that they implied.
Again, a very generous group of people related to NUI group have posted the info on how to implement this formula online: http://labs.ideo.com/2009/02/11/hacked-rear-projection-tv-into-multitouc...

By Lilia Perez
After the experience with "Frontera" in which I used 2 firewire webcams and an Open Source application created by Arjan Scherpenisse and Robin Gareus to achieve the one touch motion tracking, I'm experimenting with other forms of multitouch screen interaction. The first one I'm looking into is FTIR, which is becoming very widely used. Great tutorials about how to make your own multitouch screen can be found online. I'm using one that I found while surfing this site:
http://www.nuigroup.com
I will soon post a direct link, but I don't have it right now.