DS3231 Real Time Clock installation guide for RPi / /LE8

Sbrez81 · September 8, 2024 at 2:11 PM

Thanks all, ok I'll change the module with a new one. Any advise? At the moment I'm using the same of the guide, DS3231 in M version, I've red that SN version would be better. I've seen also DS1307 thas has external quartz.

**mglae** · September 8, 2024 at 4:11 PM

Quote from Sbrez81

I don't undestand why I see ds1307, mine is ds3231

ds3231 is supported by the ds1307 driver.

Sbrez81 · September 8, 2024 at 9:01 PM

ok thanks. I'll take another rtc but with an external battery

Sbrez81 · September 11, 2024 at 10:11 AM

Hi, I've bought another rtc and checked the battery voltage, 3,3V and followed again the guide with same results, +2 hour. So I've tried command hwclock -u -w and time now is perfect. I don't understand why but works. Anyway I'd like to know what's happening

frankvw · September 11, 2024 at 3:29 PM

If the -u switch makes a difference, my first thought is that the problem would be related to your time zone / DST settings. As mglae points out, "For historical reasons hwclock default to local time. Use hwclock -u -r to use stored UTC time correctly." I'm in South Africa (GMT + 2 and no DST) and I never needed the -u switch. YMMV.