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.

That information is then communicated over Bluetooth to the Arduino which actuates a high-speed electromagnetic gate to force the M&M down the right chute for sorting.

Automotive Grade Device Allows for the Calculation of Color Temperature, Light Source Differentiation, and Placement Behind Dark Cover GlassMALVERN, Pa., April 02, 2025 (GLOBE NEWSWIRE) -- The ...

Using a Arduino Nano 33 BLE Sense and untethered gesture recognition controller has been created using the boards 9-axis motion sensor.