[Fjord Carver] brings together an RGB LED and CdS Photoresistor ... This time around it’s an Arduino doing the measuring instead of a PIC. So why isn’t that sensor shown in this picture?

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 ...

Arduino Lilypad, Sparkfun Sound Detector, and Sparkfun RGB and Gesture Sensor. Interestingly, newly created flexible boards remained operational despite extreme stretching. This method allows for ...