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Fun project! If you wanted to make it more "autonomous", you could buy a cheap ublox neo-6m GPS chip, then the clock could set it's time (based on GPS) anywhere in the world as a stratum 1 timeserver!

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Thank you! I was thinking about it - as clocks and controller are indoor it is unlikely that there would be stable GPS signal, external antenna may be needed. Another option is to add DCF-77 receiver, this one could be used in most of the EU countries, including indoor. May be will do this in v2 version :)

Another idea is to use FRAM instead of the board flash, to solve wear out problem forever :)

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