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One point regarding the choice of battery may deserve consideration: the question of whether to install a rechargeable coin battery, or to disable a charging circuit if such a thing is provided on the module being used.
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It will switch back to V CC automatically, if and when that voltage rises back up above both the power-fail and the battery voltage level. If a sufficiently-charged battery is present, the DS3231 will switch automatically to the battery after detecting a drop in V CC voltage below a certain "power-fail" level. Some popular modules mounting a DS3231 provide a receptacle for a coin battery, attaching it to the V BAT pin. The device actually has two power supply pins: the primary source, V CC, and a secondary, backup source, V BAT. The DS3231 can run in a range between 2.3 volts and 5.5 volts. The data sheet declares it to be accurate to within 3 degrees, Celsius. The temperature can be read from the DS3231 using a Library function. It senses the temperature around the crystal and adjusts the speed of the oscillator. Accordingly, the DS3231 takes further steps to maintain accuracy. The device keeps track of time by operating its own 32.768 kHz crystal oscillator, similar to the timekeeper in an electronic watch. The DS3231 updates the values in the memory locations every second.
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This means the seconds are in one location, the minutes in another, and so forth. Each, distinct value is stored separately.
#RTC IC DS3231 WIRE LIBRARY ARCHIVE#
Through the CITATION.cff file here, which should be up to date with the permanent archive available from Zenodo.If you use this library in a publicatoin, please cite it in one or both of the following two ways: RTClib institutes a convenient RTClib::now() function for receiving a date/time snapshot, as a DateTime object, from the DS3231 device.The latter is handy for doing arithmetic with dates. as distinct values for year, month, day, hour, minute and second, or.A variable of the DateTime type can represent a specific date and time in two different ways:
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DateTime enables a versatile object for managing date and time data.The Library defines two other classes to assist with managing date and time data: