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Discovery wrote: »
The clock gains two seconds a week making the error 114 seconds per year.
My $40 Timex wrist watch is accurate to one minute a year. The wrist watch is kept at a relatively constant temperature due to its location on my wrist.
I am sure that the crystal is temperature sensitive and has xxx parts per million sensitivity. I might be able to rig a miniature temperature sensor and heating element on the crystal and run experiments.
msrobots wrote: »
why should changing the clock speed of the propeller change the crystal based frequency of the rtc-chip?