If you need to add color sensing to your next LEGO project have a look at this RCX Input Mux & Color Sensor. Full schematics and circuit description is provided.
"Color sensing depends on measuring the intensity of light at different wavelengths. A spectrometer does this by splitting the light with a prism or diffraction grating into its component wavelengths. However, spectrometers are complex and too difficult to build. Another approach measures the light intensity in three primary color bands: red, green, and blue. Then calculates the color or hue of the light in software.
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