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, PCF8523, or DS3231, see the guide at: https://learn.adafruit.com/ds1307-real-time-clock-breakout-board-kit/overview 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. Please note that dayOfTheWeek() ranges from 0 to 6 inclusive with 0 being 'Sunday' ## 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