[time-nuts] Portable Time Standard

[Petr Titěra]

On 07.03.2019 14:14, Jim Harman wrote:
> For ease of programming and reasonably low power consumption I would look
> into an Arduino.

Hello,

I can only agree. Use Ardiuno and you will have complete control about 
your environment. You can even put your board into sleep between pulses.

For display I would use some cheap 16x1 display module with parallel 
access or I2C module. There are libraries for both. If you would buy 
something do not buy that nice looking blue displays. They are not 
readable without backlight.


Petr Titera

> 
> 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 <nova at npgcable.com> 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
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