室内空气质量检测系统硬件的设计与实现

北京理工大学珠海学院2020届本科生毕业设计Design and Implementation of Hardware for Indoor Air QualityDetection SystemAbstractThis design takes STC89C52 as the core,and uses Proteus and Altium designer to designan indoor air quality detection system,which includes main chip module,gas detectionmodule,human-computer interaction module,alarm module and long-distance transmissionmodule.The system has the function of simultaneously detecting indoor temperature andhumidity,CO concentration,formaldehyde concentration,methane concentration and PM2.5index.And through the LCD real-time display,when the detection gas concentration in theindoor air exceeds the alarm value,the detection device will alert the user that the indoorharmful gas exceeds the standard by lighting the indicator light and buzzer alarm,and alsocan send the indoor air quality information to the mobile terminal through the GSM moduleSMS.In this design,AD converter is used,and two AD converters are used to convert themeasurement signals of gas concentration detected by CO concentration sensor,formaldehydeconcentration sensor,methane concentration sensor and PM2.5 sensor into the digital signalsrequired by single chip microcomputer.At the same time,based on the measurement of gasconcentration,an additional chip is added to carry GSM module The air quality detectionsystem has the function of real-time remote alarm,which makes the system alarm faster.Keywords:Indoor air quality;real time monitoring;hardware design;GSM module