Hey Tomasz! I do have experience with STM32 RTC build-in module and if you will shose accurate crystal with good capacitors it will pay off. And follow the data sheet instructions regarding RTC calibration.
On Sat, Sep 8, 2018 at 11:20 AM Tomasz Kowalczyk <[email protected]> wrote: > Suprisingly, my clock uses a counterfeit module and after modding it > (removing charger circuit) it provides accurate time. Of course, this is > not guaranteed with counterfeit chips. But as long as I am building clocks > for myself, I'm going to stick to the cheapo modules from Aliexpress. > Currently I'm learning to program STM32s, which have on-board RTC unit > with battery backup (+ few backup registers, so you don't have to burn tour > flash with settings). If they will provide acceptably accurate RTC, I'll > switch to that - I'm a fan of all-in-one-chip solutions. Does anyone have > experience with STM32 RTC? > W dniu piątek, 7 września 2018 23:54:24 UTC+2 użytkownik gregebert napisał: >> >> Be sure that you get a genuine DS3231; there are a lot of very cheap RTC >> boards out there with counterfeit/out-of-spec units. >> I think adafruit is a reputable seller. >> >> When I buy the $1 modules from overseas, I remove the RTC chip and >> install a real one I purchased from a reliable source. I had a few laughs >> about the inaccuracy of the fake/defective IC. >> >> These are very accurate timekeepers; I have one that's been running for >> over 3 years with less than 1 minute of drift. I've never reset the time so >> it's better than 1PPM long-term accuracy. Even if yours does drift a few >> PPM, there are compensation settings to solve it. >> > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/32818717-b2fe-4667-87d1-48fab9c773df%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/32818717-b2fe-4667-87d1-48fab9c773df%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAE%3DwxcmN%2Bddmx2zE3KyFr_shNwYoF9siiEQEHhVLyF6rEZkppA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
