FWIW, I’ve documented the whole R-Pi GPS NTP thing at https://hackaday.io/project/15137
As a disclaimer I will also say that I’m not even remotely the first. But what’s kind of nice is that I have a R-Pi desk clock display board that plays really well with a bolt-on GPS cap. In fact, I’ve got two of them in the NTP pool right now. Sent from my iPhone > On Oct 21, 2017, at 7:50 AM, ROY PHILLIPS <[email protected]> wrote: > > > ----Original message---- > From : [email protected] > Date : 21/10/2017 - 7:49 am (GMTDT) > To : [email protected] > Cc : [email protected], [email protected] > Subject : Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time > capture? > >>>> For under a $100 you could get a Raspberry Pi, a GPS HAT, and >>>> connect your input to a GPIO pin. Configure ntpd to log the real >>>> PPS and the input as another 'PPS'. > >>> Is there an option to log all individual PPS events? > >> # ppswatch /dev/pps0 > > That's a way to log stuff, but I don't think it comes under "Configure ntpd". > > I remember some option to log lots of stuff, but I don't remember the > details. It could have been in a driver. I couldn't find it in the man page > for the PPS driver. > > [amazon] >> Looks like $96 to me. You can save some if you buy in bulk, > > You can save $7 if you get the starter package that has only Pi, SD card, > power, and case. (Many starter packages include stuff you probably don't > need and that raises the price. But maybe one has a HDMI adapter. I didn't > look.) > > Beware of using normal USB cables and/or normal USB power supplies. The Pi > is not happy with low voltage. The drop in a USB cable can be significant. > The setups intended for use with Pis normally have 5.1 or 5.25 volts and > heavier gage wire in the cable. > > > [display, kbd, mouse...] >> Yeah, just for setup. Shall we include the price of the desk it sits and >> the building it is in? > > I'm willing to assume somebody has a table and a roof. > > The display and such are not a problem if you have a PC you can borrow them > from. (You probably need a HDMI adapter.) But that doesn't work if all you > have is a laptop or smart phone. > > I think most of my friends have PCs but I wouldn't be surprised if some of > them had a laptop and no PC. > > If your PC is old enough, the keyboard and mouse may be PS2 rather than USB. > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > 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. _______________________________________________ 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.
