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UPDATE 31 August 2019:  See my RoadTest of the Raspberry Pi 4B using OpenCV to do face recognition here UPDATE 23 August 2019:  This is an update of an earlier post about a RoadTest of the Raspberry Pi 4B with a comparison to the Raspberry Pi 3B+ using OpenCV to do facial recognition.  Issues were identified in that post that held up the RoadTest.  The issues have now been resolved and the solution posted at the bottom of this post.   I am one of the fortunate persons ...
Introduction   This is the follow-up to a post about a simple programmable DC electronic load.  Progress has not been as good as hoped and the project needs to be set aside for the time being so other priorities (like a RoadTest and life in general) can be pursued.  Hopefully this documentation will allow it to be picked  up at a later time and completed.   In the first post a design was built and tested on a breadboard, followed by perfboard.  Opportunities for i ...