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 <n...@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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