CryptoCape Hookup Guide
This Tutorial is Retired!
This tutorial covers concepts or technologies that are no longer current. It's still here for you to read and enjoy, but may not be as useful as our newest tutorials.
Contributors:
jbdatko, 
CaseyTheRobot
jbdatko, CaseyTheRobot 
Real Time Clock
The Real-Time Clock is used to keep accurate time. The driver for the DS3231M RTC will be loaded automatically with the rest of the cape firmware. If you add a coin cell battery to the battery holder, the RTC will keep time even when power is removed from the BeagleBone.
For a closer look at how to use the RTC and how I2C works on the BeagleBone Black, checkout this tutorial.