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.

Get a color-matching sensor for just $60 It's like the design equivalent of Shazam.

Now through November 9, you can get Nix Mini 2 Color-Matching Sensor for 39% off $99 at just $59.97.

Through May 31, you can get the Nix Mini Color-Matching Sensor V2 for just $49.97 (reg. $99) in honor of Memorial Day.

Take any DIY, design, or home renovation project to the next level with the Nix Mini 2 Color-Matching Sensor, now just $69.99.

Right now, you can get the Nix Mini 2 Color-Matching Sensor for 29% off $99 at just $69.99.