Instructables
As a interaction design researcher interested in interfaces and physical interaction I often find myself in the situation of building new interfaces or testing and improving new ones. Since multitouch trackpads are so expensive and the don´t offer a simple way to interpret the touch input in programming software I build my own low cost multitouch trackpad following this instructable. This is what I found in my build, and once created you can use any programming software to follow, interpret and play around with the touch input.

Sounds great? Then follow this simple instructable and build your own within just a few minutes.
 
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Step 1: Materials

Picture of Materials
Here´s what you need to build your own low cost multitouch trackpad:

> Cardboard (or box)
> Webcam (any webcam should work. I am using the Playstation Eye Camera due to its high framerate)
> Electrical tape (or ducktape)
> Glass (or transparent acrylic. I am using a picture frame since it already has a glass and makes a nice finishing of the trackpad)
> Plastic cup (or any other cup)
> white sheet of paper (any paper should be fine)
> Hobby knife or scissors to cut things

Step 2: Picture Frame

First of all we´ll build the actual tracking surface out of a picture frame with a glass (or acrylic) and a piece of paper:

1. Take apart the picture frame into its three pieces. The frame, the glass and pedestal.
2. Measure the inlet size of the picture frame and cut out an accordingly big piece of paper.
3. Place the paper into the picture frame and put the glass on top.

After this step you should have a picture frame with a white piece of white paper in it. The picture pedestal is removed and replaced by a piece of glass or acrylic.