are only loosely related to the 0V and 5V on the Arduino. Opto-isolation is the obvious answer (until TI’s non-opto-isolators are easier to get) to remove ground voltage variations, and that got me ...

A highly-integrated smart gate drive optocoupler specifying 1 A output current, with dual outputs optimized for driving high- and low-side gates of the MOSFET buffer stage. Avago’s ACPL-339J is ...