What code implementations of PID controlling do you know, to learn or base upon, to build an actual solution? I've successfully used this blog post series from

What code implementations of PID controlling do you know, to learn or base upon, to build an actual solution? I've successfully used this blog post series from 2011, which covers the principles behind a PID library for Arduino: http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-introduction/ http://brettbeauregard.com/blog/2011/04/improving-the-beginn...