Indoor Environmental Monitoring System Based On Wireless Sensor Network

In recent years,the frequency of haze weather has increased and the scale of industry has expanded,lead to the quality of outdoor environmental lower,so making people prefer indoor activities.The quality of indoor environmental has become an important factor affecting physical health,therefore,effective monitoring of the indoor environment has become more important,especially in offices and residential areas where space is not open enough.This paper designs an indoor environmental monitoring system based on wireless sensor network,which can detect PM2.5,temperature,humidity,smoke and other parameters in multiple locations in the room.Achieving the collection,uploading,display and storage of environmental data.And intelligent management of environmental parameter monitoring.This design consists of three parts:the sensing layer,the transport layer and the application layer.The sensing layer is located at the bottom of the system,including temperature and humidity sensors,dust concentration sensors and smoke sensors,which are responsible for collecting indoor environmental parameters.The transport layer includes two devices:a terminal node and a coordinator.The terminal node wirelessly sends the data collected by the sensor to the coordinator through the ZigBee network,then the coordinator connects to the router in the local area network uses the Wi-Fi module,and uploads the received environmental data to the application layer,finally,achieve the purpose of data interaction.The Wi-Fi module uses the ESP8266,both the terminal node and the coordinator use TTs CC2530F256 MCU as the main control chip,forming a wireless sensor network.The application layer is at the top of the system,including the cloud platform and mini-program.The cloud platform uses OneNET,its main function is to achieve the reception,display and storage of environmental data,at the same time the stored data can also be called.Mini-program is developed using WeChat web developer tools,its main function is to analyze and display environmental data to achieve human-mini-program interaction.The mini-program will send a request command to the OneNET platform to obtain environment data,and achieves front-end interface display,which is convenient for people to view real-time data of the environment at any time and master the condition of indoor environment.After testing,the system has achieved the collection,remote display and storage of PM2.5,temperature,humidity,smoke and other indoor environmental data.It proves that the monitoring system has perfect functions and strong practicality,so easy to expand and promote.