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  1. Unfortunately, like I already mentioned most of...

    Unfortunately, like I already mentioned most of the motor controller drivers (including DRV8825) and even CNC/3D printer boards like SmoothieBoard use a common ground for motors and logic.

    The...
  2. Ground potential difference (and thus a ground...

    Ground potential difference (and thus a ground loop) is a likely culprit.

    A simple fix is to get yourself a cheap ADuM3160-based USB isolator between Teensy and the host computer. It will limit...
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