GaborI last calibrated the clock 34 days ago. Today it was about 0.4 sec late, which would translate into under 5 seconds per year. Battery in this time frame went from 3.092V to 3.009V.
Calibration & battery update 2023-04-25
A project log for Remarkably Accurate Quartz Clock
Shooting for 10 sec/year accuracy with an ATmega and software-based, temperature-aware frequency correction
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