Although the Arduino development platform is quite powerful, when harnessed to external technology it can play a part in a much larger or more involved system. One neat example of this is by enthusiast Luka Gabrić who has created an amazing face-tracking turret without too much effort.
The Arduino us used to control the turret, with servos for both the x- and y-axis rotations. This then communicates via USB to a host PC running python code and interfacing with OpenCV. This results with an incredibly responsive face-tracking system as demonstrated in the following video:
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