Arduino enthusiasts may be interested in ... single pixel scanning camera include an Arduino Uno, Adafruit RGB Colour Sensor TCS34725, x2 BYJ-48 Stepper motor with drivers, 3mm OD aluminium ...

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 ...

You can throw a Raspberry Pi camera and OpenCV at the problem and approach it through software, or you can buy an off-the-shelf RGB sensor and wire it up to an Arduino. Or you can go back to ...