When you need to quantify the color of an object ... or you can buy an off-the-shelf RGB sensor and wire it up to an Arduino. Or you can go back to basics and build this reflective RGB sensor ...

When [millerman4487] bought a TCS230-based color sensor, he was expecting a bit more ... to compute the color and [millernam4487] provides code for it. You may, however, need to calibrate the ...

If you’d like to get more specific, Michael Klements’ Arduino-based scanner lets you quantify colors in numerical RGB values via a TCS34725 sensor. User interface for the handheld device is ...