I guess a question is why you want an RTC. If you have a decent internet connection just run NTP on something and it will set the computer's clock. If you have a cell phone install the Termux app and then NTP under that, that can be your local NTP clock.
I looked into it a little years ago when I had only a part time dial up connection. There is a time signal on GPS satellites with about 1 microsecond accuracy, it's how a GPS works, by triangulation. But then I got my first cell phone which got me both internet and an accurate time. And now I tether one to a Pi with a USB cable and it's a wifi AP for the whole house. On 2/21/21, Reco <recovery...@enotuniq.net> wrote: > Hi. > > On Sun, Feb 21, 2021 at 02:26:26AM -0800, Rick Thomas wrote: >> On Sat, Feb 20, 2021, at 11:14 PM, Reco wrote: >> > Hi. >> > >> > On Sat, Feb 20, 2021 at 10:53:18PM -0800, Rick Thomas wrote: >> > > root@pi:~# ls -l /dev/rtc* >> > > ls: cannot access '/dev/rtc*': No such file or directory >> > > >> > > What package should I file a bug report against for this problem? >> > >> > There's nothing to report. No model of Raspberry PI has RTC, so this is >> > expected. >> >> Hmmm... A little googling turns up a GPS hat from Adafruit which fits >> the Pi4B. It can double as both a battery backed hardware clock and >> an NMEA-PPS source for ntp, which would be very cool. Cost is about >> $40 which is well within the budget for this project. > > Way too expensive. A battery-backed DS1307 chip will cost you $4-5 on > Amazon *and* will do the same as far as RTC is concerned. > > Of course, if you absolutely need GNSS that's different. Separate GNSS > UART connected chip cost me $20 - a certain Neoway G7. > > And yes, you can attach both to your RPi. > > Reco > > -- ------------- Education is contagious.