The Design Of Indoor Air Quality Wireless Monitoring And Evaluation System Based On RT-Thread

This paper analyzes the functional requirements of indoor air quality monitoring and evaluation system,proposes the overall design scheme of the system.The system has three parts:an acquisition terminal,a wireless communication system and a monitoring center.In this paper,it designs the acquisition terminal based on RT-Thread and STM32.RT-Thread real-time embedded operating system has good real-time and openness.This article has completed that porting the RT-Thread to STM32F446 hardware platform and the stable operation of RT-Thread on STM32F446 hardware platform.The acquisition terminal could collect several indoor air index and send data to monitoring center,including formaldehyde,carbon dioxide,PM2.5,humidity and temperature.It design a Wi-Fi wireless communication system which the acquisition terminal and the monitoring center can exchange data through it.In this paper,I learn the traditional grey correlation analysis method,the grey correlation analysis method has low requirements for samples and the phenomenon is rarely seen that the analysis results are not consistent whit the actual situation.Based on this algorithm and relative references,this paper puts some forward few improvements to the traditional grey correlation analysis method of dimension reduction and resolution calculation.The two algorithm are programmed and simulated,the result shows that:the improved grey correlation analysis method has less computation and higher reliability.It designs a monitoring center on computer terminal,it could receive data from the acquisition terminal and display in real time,send alarm,query history data,etc.It designs an air quality evaluation method based on improved grey correlation analysis method through the c#and MATALAB joint programming.The system test shows that RT-Thread real time thread operating system can run stably;the working state of each module of the acquisition terminal is normal;Wi-Fi wireless communication system works well;the basic functions of monitoring center run normally,the air quality evaluation method has some practical significance.