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.

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

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

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

Packed in a portable pocket-size design, this high-res sensor uses Bluetooth to transmit the color-match data to your phone and integrates with apps like the Nix app and Photoshop.

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