Re: A ds3231 library for the STM32 Blue Pill
Posted: Tue Jun 25, 2024 8:14 pm
May be.ag123 wrote: Tue Jun 25, 2024 7:02 pm @STM32ardui I think sometimes observations and sheer luck (relatively unchanged environment factors e.g. constant temperature) could contribute to a higher observed accuracy.
If DS3231 is n x 0,1 ppm too fast or too slow, you can have luck to adjust it to nearly zero.
But this is only valid for 25 °C. At 70 °C LSB is equal to 0,4 ppm. No values for temperatures between.
And the crystal inside may have an aging, so after one year there is another error source to compensate.
DCF77 is only 50 km away from my home.ag123 wrote: Tue Jun 25, 2024 7:02 pm For real accurate time keeping, I'd guess regular time sync e.g. NTP or GPS would be necessary.
