Hi!
I am building a clock that fetches its time from a local NTP server (GPS
synched machine).
I am using a timer based on a 16 bit interrupt on an Arduino (ATmega328
clocked at 16 MHz).
I am implementing an algorithm to steer the this clock (nothing as
complicated as the NTP algorithms) and
On Thu, 24 Nov 2011 10:14:17 +
Miguel Gonçalves m...@miguelgoncalves.com wrote:
The clock is set by sending an NTP packet and setting the clock with the
replied timestamp plus half of the round trip time. In a local LAN this
seems a good solution. I am not after micro-second accuracy as
On 24/11/2011, at 11:42, Attila Kinali att...@kinali.ch wrote:
On Thu, 24 Nov 2011 10:14:17 +
Miguel Gonçalves m...@miguelgoncalves.com wrote:
The clock is set by sending an NTP packet and setting the clock with the
replied timestamp plus half of the round trip time. In a local LAN this
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
On Thu, 24 Nov 2011 12:56:31 +
Miguel Gonçalves m...@miguelgoncalves.com wrote:
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.
The proposed algorithm
Hi Javier!
Thanks for your help.
On 24/11/2011, at 13:16, Javier Herrero jherr...@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
Hi!!
On 24/11/2011, at 13:48, Attila Kinali att...@kinali.ch wrote:
On Thu, 24 Nov 2011 12:56:31 +
Miguel Gonçalves m...@miguelgoncalves.com wrote:
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
On Thu, 24 Nov 2011 14:21:37 +
Miguel Gonçalves m...@miguelgoncalves.com wrote:
I am using an Arduino Uno that presumably is running at 16 MHz.
I am using a 16 bit timer with a 256 pre-scaler:
1600 / 256 = 62500 Hz
1 / 62500 = 16 us
65536 - 62500 = 3036
I am setting the
El 24/11/2011 15:21, Miguel Gonçalves escribió:
I am using an Arduino Uno that presumably is running at 16 MHz.
I am using a 16 bit timer with a 256 pre-scaler:
1600 / 256 = 62500 Hz
1 / 62500 = 16 us
65536 - 62500 = 3036
I am setting the counter to 3036 and let it overflow after
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 jherr...@hvsistemas.es wrote:
El 24/11/2011 13:56, Miguel Gonçalves escribió:
Right! That is what I
Hi Atilla!
On 24/11/2011, at 14:42, Attila Kinali att...@kinali.ch wrote:
On Thu, 24 Nov 2011 14:21:37 +
Miguel Gonçalves m...@miguelgoncalves.com wrote:
I am using an Arduino Uno that presumably is running at 16 MHz.
I am using a 16 bit timer with a 256 pre-scaler:
1600 /
Hi Javier!
On 24/11/2011, at 15:15, Javier Herrero jherr...@hvsistemas.es wrote:
El 24/11/2011 15:21, Miguel Gonçalves escribió:
I am using an Arduino Uno that presumably is running at 16 MHz.
I am using a 16 bit timer with a 256 pre-scaler:
1600 / 256 = 62500 Hz
1 / 62500 =
Hi!
On 24/11/2011, at 15:16, Bob Camp li...@rtty.us wrote:
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.
An idea but I am searching for a more global and elegant solution.
In fact, after reading
On Nov 24, 2011, at 9:35 AM, Miguel Gonçalves wrote:
The software way is probably the best idea as it would account for small
differences in different oscillators. I have 3 Arduino boards and will make 3
time displays.
For precision timing with a microcontroller, I've been using
the 10 MHz
On Thu, 24 Nov 2011 16:32:04 +
Miguel Gonçalves m...@miguelgoncalves.com wrote:
Hi Atilla!
On 24/11/2011, at 14:42, Attila Kinali att...@kinali.ch wrote:
I'm not quite sure i understood you correctly, and i dont know anything
about the arduino and the avr32. But usually, you set a
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