You need to determine what attributes can be used to differentiate between a dusty surface and a clean one. I imagine diffraction of reflected light would be higher for dusty surfaces, but you'd need base line (clean surface) diffraction values to compare against, and those would probably vary quite a lot for different surfaces.Thank you guys. The intention of this is to design the sensor myself and not to use an already designed module. The sensor will monitor the dust on a flat surface like "Table"
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