The Design Of Indoor PM2.5 Monitor Based On STM32

In view of the current environmental situation, there are many PM2.5 monitoring equipment on the market. Most of the high cost of measurement precision of PM2.5 monitor and itself is not portable.From this point of view, we combined remote control thought of Internet of Things and the popularity of embedded development.This topic selected the embedded development scheme to solve the functional requirements of system design.In this thesis, the functional requirements of the system design caused the design goals and design ideas, and analyzing the system requirements in detail. A block diagram of the system was designed with functional requirements, the entire profile system used in key technology, such as μC/OS-Ⅱ and GSM(Global System for Mobile Communication).Hardware design was related to the selection of devices, it was mainly based on the chip manual, the accuracy of system measurement, stability, power consumption and system design costs and other factors to select the device. Software design was mainly based on functional requirements which used μC/OS-Ⅱ technology managed each task module to. According to the task associated with design plans for each module configuration to realize the function of each module driver. It is the final step of the test system, test software and hardware according to the needs of each functional module, and according to the measured data in combination with functional requirements analysis, the results of the analysis were used to determine the parameters of the overall system Settings and measurement. And the system design of indoor after calibration measurement, comparing with outdoor data and analysis.After a rigorous system testing, the indicators of system parameters reached the design requirements of the system. Studies showed that the system design is feasible, comparing to other monitors on the market, the design is portable, controllable power, simple interaction precise measurement, design of low cost, fast response, remote monitoring, extensions and so on. The design of equipment was designed to improve indoor air by the GSM module for remote control, meanwhile expanding the functionality of the design make this product more useful. At the same time according to the experimental results, we can obtain that concentration of PM2.5 in the case of a closed house is lower than the outdoor in sunny day, and it reached the peak point with a lag, indicating that the materials of house building for PM2.5 has a protective effect.