The ADJD-S311-CR999 is a great little color light sensor. In fact, it's so little that it can be pretty difficult to play with, so we made this evaluation board! It provides all the necessary support circuitry to discern the smallest differences between visible colors. Project description, more information and ordering can be found at https://www.sparkfun.com/products/10701 Datasheet: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/LightImaging/datasheetCR999.pdf Example Arduino Code: http://www.sparkfun.com/datasheets/Sensors/Imaging/adjd_s311_cr99_example.pde Example ARM Code: http://www.sparkfun.com/datasheets/Sensors/Imaging/ADJD-S371-v10-ARM.zip PIC Reference Code: http://www.sparkfun.com/datasheets/Sensors/Imaging/ADJD-S371-v11.zip Bildr Tutorial: http://bildr.org/2012/01/adjd-s311_arduino/