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You might check out libpixyusb, which makes direct communictation with Pixy over USB fairly easy ---

http://cmucam.org/projects/cmucam5/wiki/Building_the_libpixyusb_example_on_Linux http://charmedlabs.github.io/pixy/pixy_8h.html

I'm not sure if you're running Windows or Linux. Linux is well-tested. Windows isn't so much (for libpixyusb).

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