Hi @miccio,
A few months ago I pull requested a PID controller binding. Take a look here.
I have tested it with constant lighting, ambient temperature control, and other relatively fast processes (loop time less than 200ms) - for my setups it worked like a charm!.
I am glad I find someone to be interested in PID control, I can provide the jar when requested (momentarily I am trying to keep the tests of the binding applied to my existing running projects, that is why I am not publicly promoting this).
Best regards,
George