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I just had a pretty simple question about the RTC Clock Modules, more specifically the DS3231 RTC. Once calibrated and running on my Arduino if I were to unplug it and plug it back in, will the time and everything reset and require another calibration, or will it work like a computer that, even when reset, retains the correct time and date. Thanks!

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It depends if your module has a battery backup or not. A bare chip, by itself, will loose everything. That's why many breakout boards will have a small lithium cell on them to retain everything when the power is removed.

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  • So it will be attatched to a breadboard and then attatched to the Arduino. If the main power supply to the Arduino, which is a external 5V battery source, you are saying it would be wise to also have another backup source just in case? – tyler a Jul 18 '16 at 15:02
  • Like I said, it depends on your module. If you are building it from components, then yes you should provide a battery backup - like it shows you in the datasheet. – Majenko Jul 18 '16 at 15:03
  • This is the module I will be using – tyler a Jul 18 '16 at 15:05
  • That is what you have? Do you know what that big round silver thing is in the picture? – Majenko Jul 18 '16 at 15:06
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    Brilliant. Sorry, long day. Thanks for the help. – tyler a Jul 18 '16 at 15:08

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