Distributed-Intelligent-City-Street-Lamp-Monitoring-and-Control-System-Based-onWireless-Communicatio.doc
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1、Distributed Intelligent City Street Lamp Monitoring and ControlSystem Based onWireless Communication chip nRF401Abstract: Traditional street lamp lighting systems control style has disadvantage of low efficient, high cost and difficult to monitor, etc, so, it has not met modern city requirement. In
2、order to realize distributed long distance city street lamp state automatic control in real time, we introduces a kind of wireless long distance intelligent city street lamp monitoring and control system based on SCM technology, electric power carrier communication, and wireless communication techno
3、logy, etc. System is composed of upper PC, main controller, and each terminal controller. Upper PC controls main controller SCM MSP430F19, and transmits control instruction to field controller, MSP430F149 controls corresponding lighting lamp switchs state changing by wireless transceiver nRF401. Upp
4、er PC can effectively complete wireless long distance lighting equipment control in real time. Through experiments, transmission distance can reach 1000m in maximum. In addition, we design illumination monitor equipment, which can assure lamp shut down automatically when communication network failur
5、e.Keywords: street lamp monitoring and control; MSP430F149; nRF401; wireless communication; AT89C51; electric power carrier communicationI. INTRODUCTIONStreet lamp lighting is city part of infrastructure, which plays important position at traffic safety, society security, people living, city appeara
6、nce style and feature, as well as making a city strength and mature degree. Traditional street lamp controlling adopts time-controller or transformer (distribution box) to realize decentralized control, which has disadvantages of bad centralized management, and high failure rate. Due to without long
7、 distance data collection and communication function, street lamp management in real time has not been realized, so, lamp working, operation result, etc can not be centralize monitor, record, and static, which usually can not get timely maintenance. This paper introduces a kind of street lamp long d
8、istance monitoring and control system through research work principle, realization, and character, etc based on SCM technology, wireless communication technology, etc after analyzing disadvantages of traditional monitoring and control system. This system realizes lighting according to needed, and mo
9、nitor alarming, which complete long distance street lamp monitoring and control and has stronger feasibility 1.II. SYSTEM COMPOSITION AND PRINCIPLESystem is composed of each single lamp monitoringcontrol terminal controller equipment, street lamp monitor central station and upper PC, etc. Each stree
10、t lamp monitor central station connects with work central station by wireless transmission, and central station links with upper PC through RS232/485 or USB interface by wire style. According to different of geographical distribution situation, each work central station connects with one or multiple
11、 work slave station by wireless communication links. Upper PC obtains lighting equipment switch state by communicating with terminal equipment. And work central station can communicate with upper PC by RS232/485 or USB bus interface. Upper PC displays field lighting equipment state in real time. Eac
12、h single lamp monitor-control terminal controller can realize lighting lamp start or close by upper PC, because city lamp distance is longer, we can make street lamp monitor central station as data collection equipment through electric power carrier line as communication medium. That is to say, afte
13、r central station connected, then connects with upper PC through interface, which can fit to large scale field needs of city and realize longer distance data transmission. Distributed network structure principle is shown as Figure 1.Each monitor terminal lower PC can itself set street lamp work info
14、rmation or download control schema through upper PC, such as clock calendar, open/close time, etc. Upper can each street lamp working state; monitor central station node can transmit instruction to upper PC through wireless jumping communication among each nodes; each street lamp node controls its w
15、orking information, and realize failure alarming through electric power carrier line; if some lamp node failure, beyond this node and communication, as well as feedback this information to control central and upper PC. SCM MSP430F149 acts as monitor central station controller; upper PC connects with
16、 work central station by RS232/485 or USB bus and realizes information exchange, which responds whole system monitor and management. Monitor central station controller receiver all kinds of operation control command and setting parameters of upper PC, and each field street lamp controller collects s
17、witch analogy and realize long distance lighting lamp control according to control schema. Upper PC connects work central station by RS485 or USB bus interface; gets and storages monitoring data through work slave station uploading monitoring data. As well as downloading control schema and avoid sys
18、tem out of control phenomenon appearance because of network failure. In addition, each single street lamp controller has ability of light-intensity detection module, which can realize automatically on-off according to night or day.III. HARDWARE CIRCUIT DESIGNSystem street lamp monitor central statio
19、n controller adopts America TI .co SCM of MSP430F149; it is a kind of low power mix-signal controller, which has 16 bit RSIC structure, 16 bit register and constant generator of CPU. On running of CPU, if it goes wrong, DCO will automatically start, and assures system work normally. If program error
20、, we can set watch dog to solve it. And on program fleeting, watch dog will appear overflow situation, watch dog will produce reset signal, and make system restart, which can assure system running stability.A. Single Lamp Monitoring EquipmentMain function of single lamp monitor terminal is switch on
21、-off of controlling lamp, collecting lamp working information in real time, and communication with monitor central station controller, its hardware module frame diagram is shown as Figure 2.ISL29000 working lighting intensity range is between 1lux and 10000lux, and can transfer it into currency; out
22、putting currency is proportional to receiving lighting intensity of photodiode. Outputting currency is converted into voltage, calculate outer circumstance lighting intensity through A/D conversion, and SCM judges if street on or off. Through lighting intensity monitor module, system can realize to
23、automatically control street lamp on-off to avoid communication failure. Lower PC can get each street lamp terminal address through setting digital port coding, and realize relay driving on-off state, as well as using currency transformer to obtain lamp working state information. Single lamp monitor
24、 terminal adopts SCM AT89C51,and realize communication with MSP430F149 through electric power carrier communication. Electric power communication module is composed by electric power carrier communication professional chip SSC P300 and SSC 2.B. Wireless Transceiver Circuit Design System adopts nRF40
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