Cool Rob! GPS can be used for designing high precision disciplined oscillators replacing the rubidium oscillators. They have only one disadvantage, they need an external antenna to catch at least three satellites... A very long story (but an interesting one) is here: https://www.paulvdiyblogs.net/2020/07/a-high-precision-10mhz-gps-disciplined.html
On Sun, Nov 14, 2021 at 3:18 PM [email protected] <[email protected]> wrote: > Hello all, > > Just for fun I created a GPS Real Time Clock with the NEO-6M JAL library > since the sample file I created was just to show that it works. > > BTW. It the library and the sample file needs to be uploaded to Jallib. > For now I will not implement the GPS location functionality, only the GPS > time and GPS data are implemented in this library. > > The GPS Real Time Clock project can be found at Instructables where you > also find the video that shows that it works correctly, see > https://www.instructables.com/JAL-GPS-Real-Time-Clock/ > > Kind regards, > > Rob > > > Op zondag 7 november 2021 om 10:34:33 UTC+1 schreef [email protected]: > >> Hi all, >> >> This is an older post but I want to give you an update on this. ZetWeeh >> sent me a GPS Module (thanks ZetWeeh), the NEO-6M from which I made small >> library to extract the GPS time and date. This seems to work fine but as >> said it is a GPS module so it offers much more functionality than date and >> time only. I could upload this limited library to Jallib with only these >> time and date features. Updating it with the other GPS features will take >> much more time and I wonder if anybody has any plans to use GPS (location) >> with a PIC. If not then I will upload this library to Jallib. >> >> Kind regards, >> >> Rob >> >> >> Op vrijdag 23 april 2021 om 16:12:11 UTC+2 schreef vasile: >> >>> Kiste, correctly said about analog (I've missed a "not" in front of >>> "tic-tac") . However we lived with that for more than 2000 years (trully.. >>> much more) and we are alive...I think we can live as well without synch on >>> embedded systems. >>> Bresenham's (and Eur knows that) assure about +/-10s...+/-20s error per >>> month error after a reasonable quick calibration from an ordinary crystal. >>> Using TCXO or VCTCXO goes this error below +/-10s. That was verified on >>> various projects I did. >>> Of course it's easiest if you do not need to do any calibration. >>> best wishes! >>> >>> On Fri, Apr 23, 2021 at 12:48 PM 'Oliver Seitz' via jallib < >>> [email protected]> wrote: >>> >>>> >>>> An analog clock with hands usually *never* shows the right time, unless >>>> it doesn't run, only then it shows the correct time twice a day. >>>> >>>> And no, the internet time is not synced to an atomic clock, but to a >>>> network of atomic clocks around the world. >>>> >>>> Greets, >>>> Kiste >>>> >>>> >>>> >>>> Am Freitag, 23. April 2021, 11:40:30 MESZ hat vsurducan < >>>> [email protected]> Folgendes geschrieben: >>>> >>>> >>>> >>>> >>>> >>>> Eur, an analog clock which does tic-tac, shows accurate time twice per >>>> day. It does not need synch. :) >>>> The real question is how we do know that the network time is accurate >>>> indeed? It is synchronized with an atomic clock? :) >>>> best wishes, >>>> >>>> On Fri, Apr 23, 2021 at 12:31 PM [email protected] <[email protected]> >>>> wrote: >>>> > Hi >>>> > Thanks for all the information. >>>> > I have to read a lot. >>>> > Till then I buy a cheap timer in the shop on the corner. >>>> > Peter >>>> > >>>> > Op dinsdag 20 april 2021 om 09:45:10 UTC+2 schreef Eur van Andel: >>>> >> Hi Zet >>>> >> >>>> >> Olivier Seitz has said a lot of useful things about keeping time >>>> already. I can add that some PIC18Fs have hardware real time clocks, some >>>> even with support for a 32kHz watch crystal on special pins. This will be >>>> accurate to minutes per year. >>>> >> >>>> >> Keeping time is of no use without syncing. That also holds for >>>> calendars. Syncing is so important for agriculture that several ancient >>>> civilisations spent insane amounts of work erecting huge stones to sync >>>> their calendars with the orbit of the planet. >>>> >> >>>> >> If you want to sync your time, you need to connect to a network. I >>>> do this in several ways: >>>> >> >>>> >> - with an RN171 wifi module, which is end-of-life, so not recommended >>>> >> - with an ESP32 which is cheap but overkill >>>> >> - with a SIM800L GSM module, which needs a SIM card >>>> >> >>>> >> SIM cards with data prices of €0.01/MB can be bought for €10 at >>>> keepgo.com >>>> >> The SIM800L can be bought on AliExpress for €2 >>>> >> I wrote a library for the SIM800, which I can add to jallib if you >>>> are interested. The SIM800 is 2G only, so your country should still support >>>> that. Europe does. >>>> >> >>>> >> The mobile network knows both the time, the time zone and the local >>>> DST. (Daylight Savings Time) >>>> >> >>>> >> A low cost solution could be a local “Stonehenge” with a narrow slit >>>> and a small solar cell that gives a good signal in direct sunlight. This >>>> would require a fixed location for the hardware and an unobstructed view to >>>> (a part of) the southern sky. You will also have to do some astronomical >>>> calculations. The Druids in England did those 5000 years ago, without the >>>> internet, so that won’t be too hard. >>>> >> >>>> >> You will be on solar time and syncing with a calendar will be hard, >>>> next to impossible. So when the DST kicks in will be unknown. >>>> >> >>>> >> >>>> >> >>>> >>> On 19 Apr 2021, at 23:23:03, [email protected] <[email protected]> >>>> wrote: >>>> >>> >>>> >>> Does a library excist with timezone Amsterdam so the microprocessor >>>> can use it to send an order to start or stop a device every day at the same >>>> time? >>>> >>> >>>> >> >>>> >> >>>> >> --- >>>> >> ir EE van Andel [email protected] http://www.fiwihex.nl >>>> >> Fiwihex B.V. Wierdensestraat 74, NL7604BK Almelo, Netherlands >>>> >> tel+31-653-286573 >>>> >> >>>> >> >>>> >> >>>> >> >>>> >> >>>> > >>>> > >>>> > -- >>>> > You received this message because you are subscribed to the Google >>>> Groups "jallib" group. >>>> > To unsubscribe from this group and stop receiving emails from it, >>>> send an email to [email protected]. >>>> > To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/jallib/21a991c4-df5e-4db9-a69d-f58bfae43c94n%40googlegroups.com >>>> . >>>> > >>>> >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "jallib" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/jallib/CAM%2Bj4qsTho1s-%3D_nve92Y2qnaRZx5-5orXG7gY1MVYCgg_6WEg%40mail.gmail.com >>>> . >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "jallib" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> >>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/jallib/1191615495.236101.1619171287043%40mail.yahoo.com >>>> . >>>> >>> -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/jallib/7cd7149c-0cc1-46d4-a8a0-9673620f59c8n%40googlegroups.com > <https://groups.google.com/d/msgid/jallib/7cd7149c-0cc1-46d4-a8a0-9673620f59c8n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "jallib" group. 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