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This project aims to provide open firmware for Honeywell Rondostat radiator thermostats (HR20, HR25 etc.).
It is a continuation of project started long time ago. More information about it's history can be found e.g. on mikrocontroller.net pages (in German), in this discussion, or on original Sourceforge page.
Currently, the latest development happens here on github, with discussion on Google groups or IRC channel #openhr20 on Freenode.