In article . net,
Richard Lamb wrote:



I dunno, Jim. I'd really like to have something like this (that works!),
but maybe I'm asking for too much?

Richard



When recumbent bike guy was in here, we talked about curing ovens for
composites, and that brought up temperature control units. Those things
use rate of change to avoid temperature overshoot by scaling back power
as the set point is approached.

You do something analogous to this every time you take your foot off the
gas and then begin to brake gently, as you approach a stop sign.

But, the point is, I think you might be able to find an off the shelf
solution. There's nothing terribly sophisticated about a speedometer. In
this case, you want to measure something like degrees per minute instead
of miles per hour.