Design And Implementation Of Urban Street Light Intelligent Control System Based On Wireless Sensor Network

As an important part of urban transportation,street lamp has been replaced by energy-saving LED light source from the traditional high-pressure sodium lamp under the background of national sustainable development strategy.Although this has played an energy-saving effect to a certain extent,the control mode of street lamps still USES the traditional timed opening and closing,and the more intelligent "on demand" lighting is not implemented,so the energy saving of urban lighting is not optimized.In recent years,the rapid development of Zigbee self-group network technology based on 2.4g,narrow-bandwidth communication technology(such as nb-iot,LoRa,etc.),bluetooth MESH technology,and mobile network communication technology has made the Internet of things technology mature.The intelligent urban street light control system based on wireless sensor network technology is generated under such a background.The street light(including street light controller),light sensor,thermosensitivity infrared sensor and centralized controller are connected together through the wireless self-organized network designed by the author.The embedded software is developed with C language.The lamp controller and sensor device core are based on STM8 microcontroller and run ETOSII operating system designed by the author,while the centralized controller core is implemented with STM32 microcontroller and run ETOSIII operating system.The centralized controller connects to the Internet via wired or mobile networks and connects to cloud servers.The whole hardware network device communicates with the server indirectly through the centralized controller for the gateway.The server is developed by Java language and implemented by Tomcat+Spring+Hibernate+MySQL framework.The server provides monitoring and operation interface for users in the form of WEB page.Through the WEB page of the system,users can monitor the running state of street lamps or sensors and the energy consumption of street lamps in real time.And it can issue street lamp real-time control instruction or automatic policy execution through the WEB page.The server background sends the instructions to the central controller corresponding to the project through TCP link,and then the central controller forwards the relevant real-time control instructions or execution strategies to control the streetlamp or sensor equipment.According to the control strategy,the street lamp receives the data of the lighting sensor in the network and the trigger signal of the thermosensitive infrared sensor to adjust the lighting intensity,so as to achieve intelligent "on demand" lighting and achieve the maximum energy saving by these intelligent means.