DS3231 Real-Time Clock.

July 31, 2017

In the near future I plan to refactoring the libraries. The main goal is to improve code quality, new features and add support for different versions of Arduino boards like Uno, Mega and Zero.

For this purpose I need to buy modules, Arduino Boards and lot of beer.

If you want to support the further and long-term development of libraries, please help.

You can do this by transferring any amount to my PayPal account: [email protected]

Thanks!

• d : Day of the month, 2 digits with leading zeros (01 to 31)
• D : A textual representation of a day, three letters (Mon through Sun)
• j : Day of the month without leading zeros (1 to 31)
• l : A full textual representation of the day of the week (Sunday through Saturday)
• N : ISO-8601 numeric representation of the day of the week (1 for Monday through 7 for Sunday)
• S : English ordinal suffix for the day of the month, 2 characters (st, nd, rd or th. Works well with j)
• w : Numeric representation of the day of the week (0 for Sunday through 6 for Saturday)
• z : The day of the year (0 through 365)

• F : A full textual representation of a month, such as January or March (January through December)
• m : Numeric representation of a month, with leading zeros (01 through 12)
• M : A short textual representation of a month, three letters (Jan through Dec)
• n : Numeric representation of a month, without leading zeros (1 through 12)
• t : Number of days in the given month (28 through 31)

• L : Whether it's a leap year (1 if it is a leap year, 0 otherwise)
• Y : A full numeric representation of a year, 4 digits (Examples: 1999 or 2003)
• y : A two digit representation of a year (Examples: 99 or 03)

• a : Lowercase Ante meridiem and Post meridiem (am or pm)
• A : Uppercase Ante meridiem and Post meridiem (AM or PM)
• g : 2-hour format of an hour without leading zeros (1 through 12)
• G : 24-hour format of an hour without leading zeros (0 through 23)
• h : 12-hour format of an hour with leading zeros (01 through 12)
• H : 24-hour format of an hour with leading zeros (00 through 23)
• i : Minutes with leading zeros (00 to 59)
• s : Seconds, with leading zeros (00 through 59)

• U : Seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)

Tutorials: www.jarzebski.pl/arduino/komponenty/zegar-czasu-rzeczywistego-rtc-ds3231.html

This library use I2C to communicate, 2 pins are required to interface.

Original Code by JeeLabs http://news.jeelabs.org/code/

First fork by adafruit https://github.com/adafruit/RTClib