Alain,

You are a life savior!
Thanks a lot!
I’ll dig some more for the hardware schematic or for the hardware itself.

Skimask,

The DS1821K is a development kit for DS1821 family. The big advantage of the DS1821 family devices (at list for me) is the 3 pin package and especially the TO220 and the fact that once you set a TH, TL and a status bit it becomes a stand alone thermostat. It is true you have only one degree Celsius resolution but for my application is fine.
Regards,

Nick