These LEDs are all blue (another color could be used, but blue is normal), and they pass through a color-filtering layer of pixels, which then convert this blue light to other colors. Filtering ...

If you know the red, green, and blue components of the light that correspond to maximum reflectance, then you know the color of the object. Their sensor uses a four-lead RGB LED, but we suppose a ...

[Fjord Carver] brings together an RGB LED and CdS Photoresistor to make a color sensor. Those Cadmium Sulfide lights sensors usually have a very wide swing of resistance when exposed to varying ...