RGB Color Sensor from Adafruit
RGB sensors are used to specifically detect the color of visible light. It provides a digital return of R, G, and B, and clear light sensing values.
Technical Description
RGB sensors consist of a color sensing photodiode whose resistance changes with lights of different spectrum. Some of these sensors are equipped with IR filter to minimize the IR component and therefore allows color measurements to be more accurate.
Limitation
There is no common limitation, but you need to be careful about the appropriate operating conditions for each device.
Skill
Competent
Sample Sensor
RGB Color Sensor with IR filter and White LED https://www.adafruit.com/product/1334.
Sparkfun RGB Light Sensor https://www.sparkfun.com/products/12829.
Sparkfun RGB and Gesture Sensor https://www.sparkfun.com/products/12787.
Sample Exercise