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Building the Table Frame

I went to home depot and picked out some wood that would be good enough for the inside framing of the table. I tried to get something light weight and sturdy. The main reasons for the frame is to keep the table sturdy and also make it so the walls of the table will be square, flush, and have something to screw into. I measured out all the pieces in google sketchup and then had someone at home depot cut the pieces to size.

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Wiring the LEDs for FTIR

I contemplated making my own PCB boards for the LEDs, but after doing some searching I found some boards online that would be more cost effective and work better than making my own boards. I decided to buy the following board from futurlec.com It’s possible to get 4 individual strips from each board for making individual LED PCBs. I needed a total of 10 strips for the two sides of my acrylic so I purchased 3 boards for $9.50. The strips are good because they will allow for 4-8 LEDs per strip. I chose to do 5 LEDs with a 1ohm resistor per strip (@ 7.5v), making a total of 25 LEDs per side of my acrylic.

The LEDs I’m

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Rosco Projection Screen

Rosco Projection screen is an inexpensive projection screen that seems to give pretty good results. There’s a few places online you can buy it. I ended up purchasing it from rosebrand.com. All places sell by the yard and the the minimum size is 55″ by 1 yard. The price is $15 per yard at 55″ width. I ended up buying both the Rosco Black and Rosco Grey to see which would work best with my setup.
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Projection Screen tests…

I took some pictures of the projector projecting on 3 different types of materials. I’m using a Casio XJ-S30 Projector which has 2000 lumens and 1800:1 contrast.


The following images consist of Rosco Grey Projection Screen (left), tracing paper (middle), and Rosco Black Projection Screen (right).

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Full Multitouch Table (without sides) Picture

Current progress. Side walls are ready, but not attached yet.

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Projector Latency

Latency is a time delay between the moment something is initiated, and the moment one of its effects begins or becomes detectable. When it comes to projectors, latency refers to the time difference between the computer screen and projection from the projector. There will always be some latency (time difference) between the source image (computer) and the displayed image (projector).

Laurence Muller has a Beamer Latency Measurement Tool v0.2 that will measure the latency of the projector. Ideally anything under 20ms is really good. For multitouch, if the latency of the projector is high, there will be visible lag between finger movement of objects and the projection of these objects.
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New video! The table is (almost) completed!

New video showcasing the final table at work. The software is all a work in progress and new releases will be coming soon of all applications as well as new ones. If you like the video, please pass it on. If you don’t like the video, please pass it on anyway. Enjoy!

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My Finished DIY Multitouch Table

Well, I haven’t been able to post everything leading up to this point yet, but I wanted to get the finished images up. I’ll be writing about the process up to this point soon so that there are no gaps in the “how to” of building my table.

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