I've been curious about those cheap DS3231 chips on ebay for a while. Ordered some in to test, but never got around to it.
This fellow does an interesting write up for anyone interested. https://blog.heypete.com/2017/07/29/a-look-inside-the-ds3231-real-time-clock/ carl -------------------------------------------------------- Henry Carl Ott N2RVQ [email protected] On Sat, Sep 8, 2018 at 3:24 AM John Smout <[email protected]> wrote: > > > On 7 Sep 2018, at 22:54, gregebert <[email protected]> wrote: > > > > 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. > > I must have been lucky, as I have bought cheap Chinese DS3231 modules and > so far not observed any inaccuracies or problems. > > -- > 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/A1FBCAE6-1F22-482E-AD96-420583014709%40jsdesign.co.uk > . > 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/CAP_hP_RiHXKuRaBBNeiLxf9sLgxUZDaoSs4f3E5fsD5XxUReoQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
