CapnBry/HeaterMeter — pull request #12 by R-Burk (2014-12-10 00:37:22+00:00)
Title: [hm] Int & Deriv Patch redone

Decided that Integrators job was to help get to the setpoint. As such
limited the error it can see. Feed rate is currently a #define but have
pondered using the lid reset percentage as being the limit of a "control
zone" and going for half that value

Derivative I found that just a simple filter on the output provided
extreme smoothing which is apparently how some commercial controllers
deal with it.

Deriv filter also enables the ability to for the controller to
automatically choose when to come out of lid open time. (not in this patch)

With this change can eliminate the halfing of Integrator at setpoint(not in this patch)