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Re:Show HN: Robot that copies artist's exact strokes to repl... by vanattab on Monday August 24, 2015 @03:49PM (#10112534)
If the problem is to smooth to input data coming from the Wacom device you can try using a low pass butterworth filter. https://en.wikipedia.org/wiki/Butterworth_filter

I have used this to good effect for smoothing head tracker data.

Re:Show HN: Robot that copies artist's exact strokes to repl... by chrischen on Monday August 24, 2015 @07:14PM (#10113429)
The problem isn't the wacom data. The issue is with moving the motor smoothly when the next step is uncertain.
Re:Show HN: Robot that copies artist's exact strokes to repl... by tlarkworthy on Monday August 24, 2015 @11:56PM (#10114523)
delay it a bit then