My thoughts on "PID Controllers Part 3A of Why I don''t ...
May 04, 2018· The PID controller has an origin based on a centrifugal governor (used rotating weights to control. I have seen them in old movies, but always thought they were just props, not real!). Research indicated one of the first usages of a controller was to control the gap between millstones in windmills! This was a proportional controller.