Datasheet

Type in RTClib - and find the one that is by Adafruit and click Install

We also have a great tutorial on Arduino library installation at:

http://learn.adafruit.com/adafruit-all-about-arduino-libraries-install-use

Once done, restart the IDE

First RTC test

The first thing we'll demonstrate is a test sketch that will read the time from the RTC once a second. We'll also show

what happens if you remove the battery and replace it since that causes the RTC to halt. So to start, remove the battery

from the holder while the Feather is not powered or plugged into USB. Wait 3 seconds and then replace the battery.

This resets the RTC chip. Now load up the matching sketch for your RTC

Open up Examples->RTClib->pcf8523

Upload it to your board

with the PCF8523 breakout board or FeatherWing connected

There are a few different 'forks' of RTClib, make sure you are using the ADAFRUIT one!