Does anyone have some info how the calibrated RC change over time ?
The internal Oscillator or ???
yes the internal
Afaik it varies a lot with temperature changes , and maybe even with the voltage supplied.
Use search in top of the forum page , you will find a lot of info.
There are variations in the specs for diffrent devices, so read the data on the device you wish to use. If I remember correctly the mega48/88/168 have the better spec.
Keep it simple it will not bite as hard
No I mean over time not temp or volt.
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