[time-nuts] Clock Correction Algorithm
mail at miguelgoncalves.com
Thu Nov 24 11:37:34 EST 2011
On 24/11/2011, at 15:16, Bob Camp <lists at rtty.us> wrote:
> 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.
An idea but I am searching for a more global and elegant solution.
In fact, after reading about PLL (as someone suggested) I noticed that my algorithm is a simple PLL.
> 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.
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