SparkFun Line Follower Array Hookup Guide
MTaylor 
Installing the Arduino Library
The sensor bar is basically an I2C expander with sensors, but to simplify implementation we've created a set of drivers to collect the data in a convenient way. Visit the GitHub repository to download the most recent version of the library, or click the link below:
For help installing the library, check out our How To Install An Arduino Library tutorial. You'll need to move the SparkFun_Line_Follower_Array_Arduino_Library folder into a libraries folder within your Arduino sketchbook.
Run a test example
To verify that your hookup works, load up the "RedBot Line Follower Bar Arduino Library\ReadBarOnly" by going to File > Examples > RedBot Line Follower Bar Arduino Library > ReadBarOnly.
The default values set by this sketch should work for a fresh, out-of-the-box sensor. Set the baud rate to 9600, and run the sketch. You should see the Arduino output data every second in a few different formats. If the sketch only says that the IC communication failed, double check your wiring connections.