So you may have seen tons of people making their own Multitouch tables and you just couldn't figure out everything you need to do to build one successfully... well, here is the Instructable you've been looking for.

This small project was a long time coming. I wanted to create a box that could be easily changed into whatever optical multitouch technique I wanted. The 5 major techniques are FTIR, Rear DI, DSI, LLP, and LED-LP.

The box was a simple 5 sided box constructed out of MDF. It has one of my favorite projectors in it, Toshiba’s ultra short throw TDP-EW25U (discontinued). The camera used was an m12 PS Eye Camera in our custom acrylic box, with a varifocal m12 2.6-6mm lens. The projected image was about the size of a 22 inch screen (16:10 ratio).

Watch the first two videos to learn about everything hardware related to setting each of these methods up. The last 5 videos are separated in different steps with a single video and list of parts used, so you can skip ahead to the one you may be more interested in. If you’re new to all of this, just start the first two, sit back and enjoy:

For help with your projects check out the largest MT community in the world at http://nuigroup.com/forums/.

More information can be found at the Peau Productions website, and all products seen in these videos can be purchased at the Peau Productions store.

Step 1: Frustrated Total Internal Reflection (FTIR)

Step 2: Diffused Surface Illumination (DSI)

Step 3: Laser Light Plane (LLP)


* 19 x 27 inch ACRYLITE FF (extruded)
* 3mm Clear Acrylic (Small Support Pieces Under Lasers) + 8 Bolts and Nuts for Laser Position Adjustments
* (2) 850nm 5mW Lasers
* (2) Laser Line Generators
* Laser Power Adapter
* Laser Safety Goggles
* Ridout White Vinyl Polish/Matte Sides

Step 4: Rear Diffused Illumination (Rear DI)

Step 5: LED Light Plane (LED-LP)


* 19 x 27 inch ACRYLITE FF (extruded)
* 19 x 27 inch ACRYLITE Rear Projection Grey 7D512 RP
* Aluminum L Channel
* (80) 850nm LEDs OSRAM SFH4550
* Modified Computer ATX Power Supply Outputting 12 volts

Step 6: Conclusion

For help with your projects check out the largest MT community in the world at http://nuigroup.com/forums/.

More information can be found at the Peau Productions website, and all products seen in these videos can be purchased at the Peau Productions store.
<p>I want to a bar counter that about 7 feet long or more. What method would you use? I was thinking DSI. Also across the length I would have to use multiple projectors, so I would need use stitching / edge blending. But for the camera, do you use multiple cameras to catch the IR touch? Can you please point me in the right direction? Also considering it is a professional system I want to hire out to clubs, can you tell me what's the best camera to use for the same and also in terms of resolution, what projector resolution should be minimum? I mean its the table top 10 feet then that is = 120 inches. So if I want the projected image to be at 72dpi then thats a total of 8640 pixels which needs say 5 projectors. Which I think is a lot. So what a good quality resolution for the projected image? Hope I am explaining clearly. :)</p>
The acrylite shop doesn't ship outside North America, so i have to order from the plexiglas shop (same company, but based in Germany). Acrylite is called plexiglas here to avoid confusion. <br> <br>Now my problem is that they don't sell the same products, for rear projection i get to chose between PLEXIGLAS&reg; RP Grey 7D006 RP and PLEXIGLAS&reg; RP Grey 99561 RP. Which one would you recommend?
Either will work well
what's the thickness of the acrylic used for the ftir? and how many leds did u use in total for it?
FTIR typically uses 8-10mm thick clear acrylic. Make sure to have the sides polished. LEDs should always be spaced a minimum of 1 inch (2.5cm) or less.
when setting up a rear DI do you aim the IR leds down at the camera , just randomly around the enclosement or out through the top. And how doesnt the IR leds affect the camera while filling the box. Thanks
Yes, down towards the camera but the LEDs shouldn't be in the field of view of the camera.
For an LLP setup if I were to do this as an add-on to a open bottom glass work desk what degree line would you recommend? 89 Degree line lens or 120 degree line lens?
It's up to you but most people get the 120 degree lenses to more evenly cover the entire touch surface
Could I integrate the setup into a rear projection tv/lcd tv (projectors are expensive)? If i can't put the ir camera behind the screen, where would it go in this setup?
Yes you can, but you have to take the tv/lcd apart and separate the layers so that the camera is between the backlight and the image producing layer (LCD matrix).
I'm about to embark on this project, which method in your opinion gives the best results, FTIR vs LED-LP etc.
I prefer LED-LP for it's simplicity and really solid results
When you have your computer hooked up does the touch surface act as your mouse or does it just work for those apps. Pretty much what i am asking is, does this replace your mouse?
Yes one of the easiest and first things a lot of people use this technology for is with a mouse-driver.<br><br>Download the most common driver here: http://multitouchvista.codeplex.com/
Thanks Alot

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More by PeauProductions:How To Build An Optical Multitouch Setup: FTIR, Rear DI, LLP, DSI, LED-LP (VIDEO TUTORIALS) 
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