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Topic: Time and Attendence (Read 2 times) previous topic - next topic

mem

Perhaps the Time library in the playground could be useful for this application.

It supports  time information that can be synchronized to NTP  (or an RTC) every 5 minutes (or at any user defined interval).
There is an example sketch for synching with NTP and another that syncs with an RTC
The library can found here

robtillaart

#6
Jul 11, 2011, 09:19 am Last Edit: Jul 11, 2011, 01:13 pm by robtillaart Reason: 1
OK, never used that library,

Do you have any idea about its accuracy / timedrift ? an DS1301 RTC can drift a couple seconds per day IIRC.  -- update -- I meant DS1307
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

mem

In my experience, on a standard Arduino board with a crystal, the internal clock is accurate to a few seconds a day.
The Arduino Uno uses a ceramic resonator and the accuracy drops significantly, but should still be accurate enough to keep time within a second if synched every few minutes.

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