I'll take a look at the $50 photovore code tonight when I come back from work. Mean while, if you have time, try to write where you plug in the servos (have to be any pair of PWM pins) and where you plug in the sensors (have to be 2 analog pins). Using the samples you have found at the end of the Notebook, try to write a sketch with the definitions and pin setup. We will help you out if you get stuck.