I used the pyautogui library on Linux. Then just a simple loop with an incrementing angle, with some overshoot in the end in order for the webpage to recognize that the circle was complete. First time using the library, worked pretty well, except I had to figure out that I had to use pyautogui.PAUSE = 0 to make it not pause between mouse movements.

Did you film it by any chance? This would be a good throw-away Twitter or blog post

Arduino controlling a robotic arm holding a mouse, written in C.

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