Multi-Touch System with Lasers

About a month ago I decided that it was time to do something geeky, so I looked at a couple different projects that I could do and picked a multi-touch system. I didn’t want to do the standard FTIR system because it seemed like a lot of people were building them so I decided to do it with lasers. I stumbled across this http://arbi.trario.us/2008/11/02/diy-laser-multi-touch-table/ tutorial and set on my way.

The first step was to do a lot of planning. How big should it be? What do I need to build it? How am I going to do something like this when I don’t know anything about the technology? Well, I decided to go ahead with it based on the list of parts that were in that tutorial plus a couple things of my own.

Once all of the parts were ordered, I decided to spec out and start building the box to house the screen and eventually the projector. Here are a couple pictures of the construction process.

Once that was built enough for me to start on the electrical aspects of the screen (and once all the parts arrived), I started on that. Cut out the corners of my acrylic and struggled with my first ever electrical circuit. Mounted the lasers in some air-drying clay and plugged it in. It worked on the first test (with a lot of little adjustments) and I have the following video to show you my first test.

There is still a lot to do with the setup, including adding the projector and a screen to touch, but it is on its way and I am very happy with it thus far. Stay tuned for more updates in the coming weeks.

thanks, marc

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