Bonus Lesson: Color Comparator

Sensing color has a long history and some surprisingly complex mathematics. You can pay hundreds of dollars for a professional instrument that measures color. While this project makes no claim to be professional quality, it is quite capable of matching colors from a library. For colors that have not been added to the library, you can still get the relative amounts of red, green, and blue in the unknown color. This gizmo just reports color data. However, with a bit of ingenuity and a servo motor you could sort things based on color. An artist might find this useful when mixing paint. I'm sure you can think of more uses. There are color sensors available for microcontrollers, and these are discussed in this lesson. However, no additional purchases are needed to make the color comparator, as all it needs is a few resistors, a photoresistor, an RGB LED, and of course our trusty OLED display. There is also a podcast on this bonus lesson here: https://www.grandpasgizmos.com/post/podcast-diy-color-comparator