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Author Topic: DS 1307 stays behind in time day by day...  (Read 743 times)
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Jack Christensen
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« Reply #15 on: October 04, 2012, 03:43:09 pm »
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Quote from: KeithRB on October 04, 2012, 01:30:11 pm
This story seems appropriate here. The contractor was the dad of someone I used to work with...

"Man with watch always know what time it is. Man with two watches never quite sure."
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petethegeek
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« Reply #16 on: October 04, 2012, 04:06:00 pm »
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Quote from: stefanosfok on October 04, 2012, 05:30:02 am
Do you have any ideas on how I can synchronize my RTC with my PC system time?

Be careful. It's a very slippery slope you're on...

http://www.wired.com/science/discoveries/news/2007/12/time_hackers?currentPage=all
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zipwize
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« Reply #17 on: October 06, 2012, 09:29:42 am »
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You should check your crystal frequency. I believe the DS1307 uses the external 32.768kHz crystal. These are temperature sensitive and the cheaper ones tend to be less accurate.
There are better TXCO with a self heated or stabilized reference. You might use a trim capacitor on X1 or X2 to trim the frequency. You might just swap out the crystal and get better (or worse) synchronization. I hope this helped.
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