I've used the wiznet module, these days I'd consider the esp8266, powerful little module that can be had for a couple of dollars complete with WiFi capabilities and enough GPIO to interface GPS and some sort of serial nixie interface. On 12 Jul 2016 20:11, "Vlad" <[email protected]> wrote:
> > In addition, even MCU has not enough resources to handle TCP/IP, DHCP and > NTP, it is some solutions available to outsource it to dedicated chips. I > was using WIZ5100 (assembled as a modules) with great success. > > Regards, > Vlad > > On 2016-07-12 12:01, Chris Albertson wrote: > >> What kind of micro processor are you using to run the Nixie tube clock? >> If >> that processor could run NTP you would not need GPS. But of course you >> could always do both. GPS requires a view of the sky and maybe that is >> not available in a multi story building unless near a window. NTP would >> be >> available any place there is WiFi. Even without network connection, >> NTP >> is a good way to interface the GPS as it knows how to talk to most GPSes >> made. can handle GPS outages (like when the clock is moved away from a >> window) >> >> That said, you are likely not using a uP big enough to run NTP as a setup >> like that is about $40 vs. using a bare AVR chip for about $3. But even >> with the smaller uP you might think about having the chip keep it's own >> internal time and using GPS to discipline that internal time, much like >> the >> way NTP works. Basically the uP has a flywheel and GPS regulates it's >> speed. Let's you handle holdover gracefully. >> >> If using NMEA sentences from GPS, remember that the NMEA standard allows >> those senates to come out at any time during the second to which they >> apply. In other words the sentence itself can be up to almost a second >> "off". >> >> If you are looking for a GPS for use indoors I think you don't care about >> anything other then receiver sensitivity. Without that you have nothing, >> no signal. It is more important than a few less nanoseconds of >> uncertainty >> in the time solution. So those ublox receivers look good. I'm looking >> to buy some for another application, mobile robots, I'll use GPS for gross >> level navigation and it would be nice if it still worked indoors >> >> On Sun, Jul 10, 2016 at 10:24 PM, Mark Sims <[email protected]> wrote: >> >> The Jupiter receiver defaults to Motorola output, but can be switched to >>> Zodiac. It talks at 9600:8:N:1 >>> Frankly, it is the wrong receiver to use, particularly with an indoor >>> antenna. I would go with a modern GPS receiver with standard NMEA output >>> and a 1PPS signal. They are MUCH more sensitive and usually work >>> indoors >>> and can be had for dirt cheap. Most have an on-board ceramic patch >>> antenna. Ublox receivers seem to work well indoors. >>> >>> NAVSPARK makes a tiny little GPS board with 1PPS output. 6 for $36 or >>> one >>> free for $10 shipping (no antenna supplied, has a U.FL connector). It >>> speaks NMEA at 115,200:8:N:1 or can be setup for 9600 baud. >>> >>> The delay between message and 1PPS is receiver dependent. Usually it is >>> small enough to not be noticeable. Some receivers send the message >>> before >>> the 1PPS, others after it. You can compensate for the >>> differences/delays >>> in software. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> > -- > WBW, > > V.P. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
