Hi Again, and thanks for all of your answers!!

Here is my 1º schematic of the PID Controller. As i say in my revious post, the Buttons, is to set the SetPoint, and change the Ki, Kp, Kd, variables.




malc-c
Good advice Al

@gadelhas
Most of the code in the PID thermostat thread was written by Darrel and Henrik, and contains a means of tuning the values you mention. Later this evening I'll go back through the early versions of the code I have for a single PID channel that can be configured via a PC running Hyperterminal and communicating via the serial port. I'll zip it up and attach that to the post. You can then experiment with the values and compose your report
@ malc-c , if possible put the code here as you had mension. I would appreciate.

@ HenrikOlsson, I'm reading and trying to understand your PID routine, i will post some questions soon about it, i have some questions!!
The Heater resistor that i have is 220V AC, i think it's better to do, like malc-c did, with a Solid State Relay, and low speed PWM.

@ malc-c Again. I see your video, and i think the result its really great. If you change the Kp, Ki, Kd, variables, do you see any change to the process? Like, more slow/ fast to achive the SetPoint, for instance?

Thanks once again for everything.
Hope you can understand my english, sorry for all the errors!