[time-nuts] Clock Correction Algorithm

Bob Camp lists at rtty.us
Thu Nov 24 10:16:25 EST 2011


Hi

How about simply adding 1 ms every other second? You could then fine tune it by picking a small number of seconds to not add a ms to.

Bob



On Nov 24, 2011, at 7:16 AM, Javier Herrero <jherrero at hvsistemas.es> wrote:

> El 24/11/2011 13:56, Miguel Gonçalves escribió:
>> 
>> 
>> Right! That is what I am doing.
>> 
>> 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.
>> 
>> 
> 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
> 
> 
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