I know there have been a ton of PID threads. But it is getting to be crunch time and I am sure that one more reference document will not go wasted.
I just came accross this simple paper from the great folks at
www.embedded.com ::
PID Without a Ph.D.
I think it is a good introduction with many graphs and very good implementation details. An excellent How To.
I have pieced together a printer friendly version of the paper -- PM me (include your e-mail address) and I will shoot you a copy (it is 21 pages including 18 nice figures)*.
FYI
Joe J.
*I hesistate to upload it because it is not my work and I think the guys from embedded.com deserve the traffic. Am no lawyer but I think sharing a printer friendly version falls within so called "fair use." Again, just PM me and I will save you a few minutes of cutting and pasting.