README.md
This is a fork of JeeLab's fantastic real time clock library for Arduino.

For details on using this library with an RTC module like the DS1307, see the guide at: ]]>https://learn.adafruit.com/ds1307-real-time-clock-breakout-board-kit/ove...]]>

To download. click the DOWNLOADS button to the right, and rename the uncompressed folder RTClib.

Place the RTClib folder in your arduinosketchfolder/libraries/ folder. 
You may need to create the libraries subfolder if its your first library. Restart the IDE.

Compatibility




  
MCU
  
Tested Works
  
Doesn't Work
  
Not Tested
  
Notes




  
Atmega328 @ 16MHz
  
X
  

  

  



  
Atmega328 @ 12MHz
  
X
  

  

  



  
Atmega32u4 @ 16MHz
  
X
  

  

  
Use SDA/SCL on pins D3 & D2


  
Atmega32u4 @ 8MHz
  
X
  

  

  
Use SDA/SCL on pins D3 & D2


  
ESP8266
  
X
  

  

  
SDA/SCL default to pins 4 & 5 but any two pins can be assigned as SDA/SCL using Wire.begin(SDA,SCL)


  
Atmega2560 @ 16MHz
  
X
  

  

  
Use SDA/SCL on Pins 20 & 21


  
ATSAM3X8E
  
X
  

  

  
Use SDA1 and SCL1


  
ATSAM21D
  
X
  

  

  



  
ATtiny85 @ 16MHz
  
X
  

  

  



  
ATtiny85 @ 8MHz
  
X
  

  

  



  
Intel Curie @ 32MHz
  

  

  
X
  



  
STM32F2
  

  

  
X
  






ATmega328 @ 16MHz : Arduino UNO, Adafruit Pro Trinket 5V, Adafruit Metro 328, Adafruit Metro Mini
ATmega328 @ 12MHz : Adafruit Pro Trinket 3V
ATmega32u4 @ 16MHz : Arduino Leonardo, Arduino Micro, Arduino Yun, Teensy 2.0
ATmega32u4 @ 8MHz : Adafruit Flora, Bluefruit Micro
ESP8266 : Adafruit Huzzah
ATmega2560 @ 16MHz : Arduino Mega
ATSAM3X8E : Arduino Due
ATSAM21D : Arduino Zero, M0 Pro
ATtiny85 @ 16MHz : Adafruit Trinket 5V
ATtiny85 @ 8MHz : Adafruit Gemma, Arduino Gemma, Adafruit Trinket 3V