He used an Arduino, and multiplexed RGB LEDs with some digital potentiometers ... By entering the correct color code, the pad will flash green and unlock the door for 10 seconds.

Messing around with Arduino can lead to some fun projects ... due to possible variance in the manufacturing process. These color bands and the necessary orientation to read them are universal ...

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 ...

RGB light setup. [Kerimil] recently wrote up this project on the Arduino.cc, and is sharing all of the source code and plans. While many of our seasoned Arduino-lovers can easily throw together ...

“The color sensor tells the Arduino ... components used to create the Arduino powered single pixel scanning camera include an Arduino Uno, Adafruit RGB Colour Sensor TCS34725, x2 BYJ-48 Stepper ...

For prototyping, Infineon has a RGB LED lighting control shield for Arduino, based around its ARM Cortex-M0 XMC1202 microcontroller. On board is something called a ‘brightness colour control unit’ ...