Lesson learned: You get what you pay for. I bought a $2 US realtime clock module on Ebay, imported from China, and the DS3231 chip appears to be counterfeit because it was not keeping accurate time. I was suspicious about the price, considering I paid almost $8 US just for the DS3231 from a reputable supplier. Over a few days, it lost about 1 hour of time.
After replacing the chip with a genuine Maxim DS3231, it's running correctly. A quick web-search found there are several others who have experienced this. Despite having to replace the RTC chip, the module itself is still worth the price because it included a rechargeable Li-ion coin battery and a serial EEPROM (no time yet to see if that's working correctly...) -- 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/80b61558-a3f8-4938-b16a-30c9bdadd04c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
