uRTCLib https://github.com/Naguissa/uRTCLib

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uRTCLib

DS1307, DS3231 and DS3232 RTCs basic libraryReally tiny library to basic RTC functionality on Arduino.

Supported features:

- SQuare Wave Generator
- Fixed output pin for DS1307
- RAM for DS1307 and DS3232
- temperature sensor for DS3231 and DS3232
- Alarms (1 and 2) for DS3231 and DS3232
- Power failure check and clear

See uEEPROMLib for EEPROM support, https://github.com/Naguissa/uEEPROMLib

Note: For AtTiny you need TinyWireM library from Adafruit installed (available on library manager).

I2C locked in unknown state

If uC crashes and I2C communication is locked in a unknown state you have a procedure to unlock it. It's not implemented in this library but you can find an explanation and a PIC implementation thanks to @rtek1000 in #42 : https://github.com/Naguissa/uRTCLib/issues/42

See also
  https://github.com/Naguissa/uRTCLib
  https://www.foroelectro.net/librerias-arduino-ide-f29/rtclib-arduino-libreria-simple-y-eficaz-para-rtc-y-t95.html
  naguissa@foroelectro.net
  See uEEPROMLib for EEPROM support.

Version
  6.9.2