Once upon a time I thought about going GPS, but I now have 3 options that make it unnecessary
- Internet-based. As long as my WiFi & router are up, the Raspberry Pi Zero W acquires and regularly synchronizes to an accurate time source. It is indistinguishable from the cellular network time on my phone. - DS3231 RTC chip. I have one that's been running for over 2 years now in the garage, and I have never adjusted the time. It's within 15 seconds of the real time. That's about 0.25 PPM. I did not do any tweaking of the aging-offset register. - AC line frequency reference. Boy, was this a surprise to me. My first nixie clock design uses the AC line frequency, and I never need to change the time except when daylight savings time starts or ends. While it may drift +/- a few seconds throughout the day, the utility company is going to extreme measures to keep it accurate over the long term. -- 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/e2e7ad81-4466-44c9-be34-ce71e659522c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
