The Research And Realization Of Indoor Air Quality Monitoring System Based On STM32

In recent years,environment was severely destroyed by the using of fossil energy,the air quality was gradually getting worse.With the improvement of living standards,people are concentrating on indoor air quality.In order to improve family living environment,it is necessary to monitor indoor air quality so that the effective prevention and improvement measure can be taken.After investigating the fields of indoor monitoring systems,some disadvantages among different systems are found which are few parameters,poor instruction function and cumbersome data transmission.An indoor monitoring system based on STM32 is designed to tackle these problems.The system consists of monitoring nodes,general station,server and mobile phone APP.It can monitor the real-time parameters of PM2.5 and PM10,CO,CO2,CH4,air temperature and humidity and has the functions of the light indicator and APP display.The general station uses UDP protocol to communication with nodes and transforms the information to server by HTTP-GET protocol.The hardware design of the system consists of two parts: the air monitoring node design and the general station design.The hardware design of air monitoring node comprises the MCU circuit,the wireless communication circuit,the LED indicator circuit,the power supply circuit and the contruction design of circuit board.The hardware design of general station includes the MCU circuit,the wireless communication circuit,the power supply circuit and the contruction design of circuit board.The system software design includes the design of MCU program and the design of communication protocol.MCU program design includes the program of main control MCU in nodes,the program of deputy MCU in nodes and the program of MCU in station.The design of the communication protocol includes the communication protocol in nodes,the communication protocol between the nodes and the general station,the communication protocol between general station and the server.Finally,the monitoring system has been tested in the article,including the hardware circuit test,the system communication reliability and the APP test.The test results show that the system function is perfect.Now,the system has been delivered,running stable.