Rtclib

I don't maintain this, so you probably shouldn't use it! (Not sure if it still works!)

A Real Time Clock (RTC) Library for DS1307 compatible chips.

Tested to compile under Arduino 1.0.3

Also inclues DS1307, DS3231 (Chronodot) and DS3234-SPI specific functions.

Basic functions (see examples of how to use): .begin .adjust .isrunning .now

DS1307 specific functions: .readMemory .writeMemory

DS3231 specific functions: .getTemperature .getA1Time .getA2Time .setA1Time .setAlarm1Simple .setA2Time .setAlarm2Simple .turnOnAlarm .turnOffAlarm .checkAlarmEnabled .checkIfAlarm

DS3234 specific functions: .getTemperature .getA1Time .getA2Time .setA1Time .setAlarm1Simple .setA2Time .setAlarm2Simple .turnOnAlarm .turnOffAlarm .checkAlarmEnabled .checkIfAlarm

Credits:

• Code by JeeLabs http://news.jeelabs.org/code/ Released to the public domain! Enjoy!

• Optimized DS1307 code by ADAfruit and others

• Merged read/write RAM memory functions from:
  github.com/dmalec/RTClib by MrAlvin 2012-02-27

• Merged DS3231 & DS3234 functions from: github/coobro/RTClib by MrAlvin 2012-02-27

  Alarm code for DS3231 (Chronodot) heavily used/modified 
  from Eric Ayars DS3231 library  by  Coobro
  
  Eric Ayars code is located at: 
  http://hacks.ayars.org/2011/04/ds3231-real-time-clock.html
  

• Chronodot keyword added by MrAlvin 2012-02-28

• DS3234 functions added by Daniel Knox