Joe Hobart writes:
> 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.
That's the
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
Here is an example Arduino sketch that controls the DS3231, blinks the
Arduino's LED, and displays the current time and temperature on the
controlling PC, using the Arduino Wire and Chronodot libraries. For even
better precision, you would want to run the PPS line to an interrupt and
use an ISR to
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
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
Joe Hobart writes:
> Your accuracy results are impressive. I have questions:
>
>What manufacture or brand DS3231 do you have?
There are two modules you can get easily from the usual places, prices
and delivery times vary wildly. The first and larger variant used to be
called ZS-042, but now
Hello,
as I've said these are quite new, cheap RTC modules. There is DS3231SN
on them. Based on markings they were manufactured somewhere in 2008 but
I've bought them recently.
I have two those modules. Both connected using I2C.
First module is connected to Orange Pi sitting on my table. Pi is
Hello Petr,
Your accuracy results are impressive. I have questions:
What manufacture or brand DS3231 do you have?
What do you use to communicate with the DS3231 and display time?
How long has your DS3231 been running?
Have you changed the crystal aging offset register(s) to
Hello,
sorry to reopen this old thread but it took me some time to measure. As
I've said I have one RTC module sitting right on my desk in my room
where temperatures can go anywhere between 3C and 20C.
Using naive method of comparison of time difference between system time
and RTC module I get
I will probably sound dumb but did you consider cheap RTC chips? I have
one based on DS3231 currently on my table and although its is specified
to have precision +/-2PPM my seems to be in range about 0.5PPM right
from package with possibility to do some corrections.
Petr Titera
Dne 11. 1. 2019 v
Mechanical chonometers are still rated and the offset applied. This was
probably the earliest application of the offset with respect to the time
standards of the day. I.e. Greenwich and USNO among others.
Content by Scott
Typos by Siri
On Jan 12, 2019, at 5:15 PM, Jim Harman wrote:
I
I don't have modern knowledge of this, but traditionally marine
chronometers were not adjusted for precise timekeeping, but rather would be
"rated" for how much they would gain or lose per day and that correction
would be applied at the time of the astronomical observation.
Do you have an
Here is more explanation:
I need a stand-alone, easily portable unit with display; the unit may be used
where GPS, cell phone, or WWVB are not available. Low power consumption is
highly desirable.
I have seen advertisements of marine quartz chronometers listing an accuracy as
good as <0.01
Joe,
Would a mobile phone with a good GPS clock meet your needs?
Or does it need to be a stand-alone device?
73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv
Hi Joe
My Casio Lineage 5161 sun-powered radio-controlled wristwatch seems to
be in accordance with all our requirements
(free advertisement)
73 de Jean-Louis F6AGR
Le 11/01/2019 à 20:57, Joe Hobart a écrit :
I need a relatively lightweight, self powered, portable clock accurate to 1
On 1/11/19 12:26 PM, Bob kb8tq wrote:
Hi
The most common approach to “monitor” a quartz movement is to listen to
it at 32,768 KHz with a tuned microphone. If it is an analog movement, then
one can detect the sound of the motor driving the mechanical side.
Do you need a device with a visual
On 1/11/19 11:57 AM, Joe Hobart wrote:
I need a relatively lightweight, self powered, portable clock accurate to 1
second per month. Temperatures may range from 10 to 35 C; altitude from 1000 to
7000 feet. Although expensive, some of the marine quartz chronometers appear to
meet this
You might try a telephone pickup coil to detect the magnetic "ticks" from a
quartz clock. They even come with a plug and a suction cup!
On Fri, Jan 11, 2019 at 3:34 PM Tim Shoppa wrote:
>
> I am not an expert in every quartz clock mechanism BUT a 1-10mH nonshielded
> inductor makes an excellent
Many of the 70's/80's Japanese marine quartz chronometers had a test button
that gave you an audible beep every second.
I am not an expert in every quartz clock mechanism BUT a 1-10mH nonshielded
inductor makes an excellent pickup for the "ticks" from any quartz clock or
watch that I've ever met.
Hi
The most common approach to “monitor” a quartz movement is to listen to
it at 32,768 KHz with a tuned microphone. If it is an analog movement, then
one can detect the sound of the motor driving the mechanical side.
Do you need a device with a visual readout or are you after something that
I need a relatively lightweight, self powered, portable clock accurate to 1
second per month. Temperatures may range from 10 to 35 C; altitude from 1000 to
7000 feet. Although expensive, some of the marine quartz chronometers appear to
meet this requirement. ~0.3 PPM.
Does anyone have any
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