[time-nuts] Ultra low power RTC

[Jerry Hancock]

I would have thought better.  

I built a nixie clock from Tubeclocks.com <http://tubeclocks.com/>.  Granted it is in a pretty constant temperature, but I doubt that clock varies less than 3 seconds per year.  Peter, the designer, sent me some code that takes a 1PPS but I never got it running as I liked the fact that it was undisciplined (like my kids) and still incredibly accurate.  I just checked it as it had been running 4 months since I moved it to my new office and I doubt is off 1/5th a second.

Regards,

Jerry

> On Mar 6, 2018, at 2:59 PM, Mark Sims <holrum at hotmail.com> wrote:
> 
> Sparkfun is selling an interesting RTC clock chip board.  It draws 22 nA.  It has a rather novel clock generator... a tuning fork crystal disciplines an RC oscillator every few minutes.  They claim 3 minutes per year drift.
> 
> https://www.sparkfun.com/products/14642
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