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This is a very accurate Real Time Clock that is easy to use. There are good Arduino libraries for it and it integrates well into other projects. Being an I2C device it uses minimal connections to the Arduino. Having a battery means it does not have to be re-set every time the Arduino is started.
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DS3231 is precise, temperature compensate real time clock. Can also work as temperature meter (not so precise here +/- 3degC). Here, it comes as a built module. Bring +V, GND, SDA and SCL (I2C) to your processor/Arduino/RaspberryPi, program and is working. Time, calendar, alarms. Board contains DS3231 and supply (you can switch the power off for few days and module is still ticking - you don't have to set it up again after power re-connection). Good module.
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Used on Arduino This works very well and is useful for logging applications. Easy to get going using arduino libraries.I ran it off 3.3v to make sure not to over charge the lithium battery. You need to set the time/date on first use - that's a bit hit and miss if you don't have the ability to sync with NTP via the ethernet. If you have a Raspberry Pi it's easy to set the time correctly - it will be remembered after that
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Nice high accuracy module (compared to DS1307), depending on libraries used, you can also get a temperature reading...
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This is the second board I have used and both are extremely accurate and easy to use. Recommended.
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