[time-nuts] keeping Arduino timekeeping and clock synced up

[Tom Van Baak]

> So, do you run the whole thing off 12V (which is what I'm going to do) 
> and a float charged battery OR do you do something clever like detect 
> when power is failing and save it in NV storage, then when you come back 
> up, you send a bunch of clock ticks real fast to catch up.

Use a high-res Arduino web cam facing the wall of clocks and write OHR (Optical clock-Hand Recognition) code. That way its a single robust solution for setting it the first time, restarting it on power failure, resyncing after replacing a failed clock, or self-correcting after any mechanical glitch. You can also use the same video feed to show off the project live on the JPL web site.

/tvb