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The RGB Shades have several available I/O pins for adding external sensors and other electronics. In this simple example, we've attached a ChronoDot RTC module to the RGB Shades, allowing the RGB Shades to display the current time and date as a scrolling text message.
The ChronoDot is an I2C device. On Arduino-compatible boards (such as the RGB Shades) the I2C interface is accessed using the Wire library, and uses pins A4 and A5.
The Time library is a great way to implement timekeeping functions. It has a built-in method to sync with the ChronoDot. Here's example code showing how to use the Time library on the RGB Shades: https://codebender.cc/embed/sketch:161385