Here is an example of the use of Openframeworks and arduino. There is a LDR (light depend resitor) attached to the arduino, wich in turn sends the raw data to Openframeworks. The software calculates to exact location of the sensor in relation to the pixels on the screen.
This is just a test video, the application for this would use a projector and projected space.

Thanks for watching!
For the code visit: bykosmo.com

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