[time-nuts] Clock Correction Algorithm

[Javier Herrero]

El 24/11/2011 13:56, Miguel Gonçalves escribió:
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> Right! That is what I am doing.
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> The problem is the drift between adjustments. Arduino's clock is slow 25 ms every minute and if temperature changes it will surely be different.
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That is more than 400ppm error, that sounds quite high. Is the clock 
frequency of the Arduino so drifted? I would try first to check (and 
correct a bit) the source of that error. If the crystal frequency is ok, 
perhaps there is an error in the programming of the timer that generates 
the timing interrupt.

Regards,

Javier