Re: Progress report [Re: Debian Bullseye on Raspberry Pi 4 4GB?]
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 <recoverym4n@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
>
>
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