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Forum Index : Microcontroller and PC projects : the drift of your rtc is...
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| plasma Guru  Joined: 08/04/2012 Location: GermanyPosts: 437 |
hi, a friend of mine needs a user defined clock , this time without internet connection so i can only use a rtc modul or a gps module here . so i ask : how big is the drift of your rtc over a year? |
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| PicFan Senior Member  Joined: 18/03/2014 Location: AustriaPosts: 133 |
I have since 3 months a DS3231 in use. The difference is presently about + 0.5sec compare with DCF-77. It is the Standard-Chip of the DS3231 ! |
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| plasma Guru Joined: 08/04/2012 Location: GermanyPosts: 437 |
thx picfan |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5036 |
I bought one of these from ebay... PCF8563-RTC-Board-CMOS-PCF8563T-Real-time-Clock-Calendar-Module-Development-Kit Drift is about 4 minutes a day! Funny how a cheap battery powered clock mechanism can not loose a minute a year, but a dedicated RTC can loose minutes a day. The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1805 |
I've been running a DS3231 module from EBay so maybe not genuine. It is 8 seconds fast compared to GPS in 2 months. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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