Although controlling servos with an Arduino ins't anything new, creating a user interface for real-time control can take many paths. One of these has been explained by Arduino enthusiast Chirag Nagpal whose project shows how to control two servos via a typical computer mouse. He uses a python script to read the position data from the mouse and passes this on as X and Y coordinates to the Arduino via USB, which then in turn controls the servos. A quick demonstration is in the following video:
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