The Design And Implementation Of Multi-node Indoor Air Quality Monitoring System Based On Wireless Router

With China's economic development, and accelerating the process of urbanization and industrialization, people's living standards constantly improving, pursuit of higher and higher quality of life and the environment. Corresponding to this is the growing environmental problem. The brunt of air pollution in recent years, the heavy smog in China occur frequently. In Beijing, for example, 2013 only 48% days of air quality up to standards, heavy pollution days at 16%. In Nationwide, about 600 million people affected by the haze effect. 2013 had most smog days in 52 years, air pollution is particularly prominent. Because of this, people's awareness of air quality ever. Attention to indoor air quality remains a blind spot of public air quality data. Economic and technological development and deterioration in air environment for indoor air quality monitoring has brought unprecedented opportunities for development. Ambient air quality of life so that the air quality monitoring system development and popularization of a trend.Based on the study of indoor air quality monitoring system at home and abroad on the basis of traditional indoor air quality monitoring system of singlenode, single monitoring, high threshold and high price disadvantage. Using wireless local area network technology in monitoring system, and monitoring system running on your wireless router, wireless local area network and monitoring network in one of the family. And STM32 monitoring system platform and sensor node data returned over WLAN to the master node. Users use mobile phones, tablets and other smart devices through Web access to monitor results, and manage the system. Entire system has wireless, networking and multi-node, easy operation and low cost.This paper introduces the background of air quality test standards and test equipment development. And then establishes the objectives and content of this paper, and depending on the research objective of overall design and selection of key technologies and research. By comparison, it was finalized based on “the air quality index(AQI) technical regulations HJ633-2012 standards” of air quality assessment for the subject system; using wireless LAN technology as the research of network transport technologies; using PHP as the Web server technology; using Open Wrt embedded Linux system as a platform operating system; using SQLite database as the system database; use the STM32 micro platform as a child node hardware platform. Finally, system hardware and software implementation process as a whole, hardware design focuses on child sensors, Wi-Fi communication module and the STM32 design software includes master data processing system design, Web design, Web front end server pages design, child node data transmission system design.