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A layman's analogy guide to PIDs & PID Tuning
The Wikipedia explanation will likely make your eyes glaze over: https://en.wikipedia.org/wiki/PID_controller
So here is a simplified layman's analogy guide to understand PIDs and PID settings by @noorbeast, followed by practical examples and a video tutorial to JRK PID tuning by @Avenga76: http://www.xsimulator.net/community/threads/a-laymans-analogy-guide-to-pids.7649/
By Tim Wescott
This article will tell you how to implement a simple controller in software and how to tune it without getting into heavy mathematics and without requiring you to learn any control theory. The technique used to tune the controller is a tried and true method that can be applied to almost any control problem with success.