In the case of working with a MCU:
S0/S1 selects the output frequency scaling factor, S2/S3 selects the color filter of red, green, blue, then OUT outputs a square wave with frequency proportional to the selected color intensity. The detected color can be determined by the ratio of the intensity of red, green and blue.
Note:
Development resources: demo codes, schematic, datasheets, etc.
Wiki: www.waveshare.com/wiki/Color_Sensor
Weight: 0.01 kg
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Color Sensor, complete color detector