Inhalable particles and fine particulates in dust will pollute the indoor environment and endanger people's health. It is an important task to take effective measures to control indoor dust pollution. The key is to keep abreast of the dust concentration, and to monitor, control and evaluate the sources of indoor dust pollution. This paper analyzes the main sources and characteristics of indoor dust and uses dust sensor to collect dust and transform photoelectric signals. It applies micro control unit (MCU) to control the system and process data, and designs the dust concentration monitor. The monitor can be used as an independent equipment and also a combination of a variety of sensors through the serial port to monitor indoor environmental parameters and control environmental control facilities, thereby purifying indoor air.
Key words: Light scattering, dust, dust sensors, micro control unit (MCU).
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