For ease of programming and reasonably low power consumption I would look into an Arduino.
There are libraries available to control the DS3231 and your choice of displays. The Chronodot is a nice prototyping package for the 3231. https://www.adafruit.com/product/255 On Wed, Mar 6, 2019 at 8:02 PM Joe Hobart <[email protected]> wrote: > Hello Petr and others, > > Thank you for the suggestions. I have several DS3231 modules running. I > was > able to adjust one to 0.04 PPM fast, which is more than good enough for my > requirement of one second a month (this is at a constant temperature, but > these > RTC chips are supposed to be temperature compensated). > > I can read and write the DS3231 registers with a Raspberry Pi. > Unfortunately, > the RPi kernel sends time to the RTC every 11 1/2 minutes. This time is > usually > moderately accurate, but I have measured errors of up to 0.264 second, > which is > unacceptable. > > Does anyone have suggestions for a very low power controller and display > for > this RTC integrated circuit? The DS3231 has a 1 Hz square wave output that > could signal the controller to read and display the time and date from the > DS3231. The controller could sleep between updates, which would conserve > batteries. > > Thanks again for all the suggestions, > Joe > > By the way, the manufacturer of the high accuracy marine chronometer I was > considering will not send specifications for other than 22 +/- 1 degree C. > > > These DS3231 modules are a complete clock > > > > -- --Jim Harman _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
