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The DS3231M real time clock is a low-cost, extremely accurate, I2C realtime clock (RTC). The device incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. The integration of the microelectromechanical systems (MEMS) resonator enhances the long-term accuracy of the device and reduces the piecepart count in a manufacturing line. The DS3231M is available in the same footprint as the popular DS3231 RTC.
Arduino library for accessing the maxim integrated . This clock requires no external components and with an internal temperature-compensated oscillator it is extremely accurate, to within ±5ppm or ±0.432 Second/Day. The library allows setting the date/time and alarms as well as accessing other information on the DS3231M.
The DS3231M is available as a SO8 or SO16 package and runs on both 3V and 5V systems. It has two alarms and also battery backup circuitry and requires no external crystals/oscillators or capacitors to run.
A detailed description of the library along with further details are available at the GitHub DS3231M Wiki. This includes wiring information and sample sketches that illustrate the library and it's functionality.
