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The Sharp Optical Dust Sensor (GP2Y1010AU0F) is especially effective in detecting very fine particles like cigarette smoke, and is commonly used in air purifier systems.
In the case of working with a MCU:
As shown in the first picture above, you can add the bottom pinheaders (not soldered by default) for easily connecting the module to your application board.
The Sharp Optical Dust Sensor (GP2Y1010AU0F) is especially effective in detecting very fine particles like cigarette smoke, and is commonly used in air purifier systems.