智能照明控制系统英文文献

2009 International Conference on Networks Security, Wireless Communications and Trusted Computing

Distributed Intelligent City Street Lamp Monitoring and Control System Based on

Wireless Communication chip nRF401

Yu CHEN, Zhaoyu LIU

Zhengzhou Institute of Aeronautical Industry Management

Zhengzhou, China

e-mail: chenyu@

Abstract—Traditional street lamp lighting system’s control

style has disadvantage of low efficient, high cost and difficult to

monitor, etc, so, it has not met modern city requirement. In

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

technology, 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 switch’s state changing by

wireless transceiver nRF401. Upper 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 failure.

Keywords-street lamp monitoring and control; MSP430F149;

nRF401; wireless communication; AT89C51; electric power

carrier communication

II. S

YSTEM

C

OMPOSITION AND

P

RINCIPLE

I.

I

NTRODUCTION

Street lamp lighting is city part of infrastructure, which

plays important position at traffic safety, society security,

people living, city appearance 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 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 distance 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

monitor alarming, which complete long distance street lamp

monitoring and control and has stronger feasibility. [1]

System is composed of each single lamp monitoring-

control terminal controller equipment, street lamp monitor

central station and upper PC, etc. Each street 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

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.

Each 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, after 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.

Display Upper PC Printer

Wireless communication

Street lamp monitor Street lamp monitor

…

central station 1 central station n

Electric power carrier communication

Single lamp monitor Single lamp monitor

…

terminal 1 terminal n

Figure 1. Distributed lamp monitoring and control system structure.

Each monitor terminal lower PC can itself set street lamp

work information 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 working information, and realize failure

978-0-7695-3610-1/09 $25.00 © 2009 IEEE

DOI 10.1109/NSWCTC.2009.69

278

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 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 switch 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 system

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. H

ARDWARE

C

IRCUIT

D

ESIGN

System street lamp monitor central station 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,

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 Equipment

Main function of single lamp monitor terminal is switch

on-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.

Electric power carrier line

Electric power line interface

Electric power line carrier communication module

Dimming

Single lamp controller

Address

coding module

AT89C51

Real-time A/D Relay

clock transformer module

Voltage Currency

Photoelectric

conversion

conversion monitor

Figure 2. Single lamp monitoring and control system structure.

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 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 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

P111. [2]

B. Wireless Transceiver Circuit Design

System adopts nRF401 wireless transceiver chip of

Nordic of Norway as core of wireless communication

module [3].

Core architecture of Bluetooth technology, the

ability of anti-jamming is very strong of type of modulation

FSK. The working frequency is stable and reliable and

peripheral components are few. So it is adapt to design

portable hand-in products. Owing to its low transmitting

frequency, high receiving sensitivity and carrier frequency

which value is 433MHz of ISM frequency band. nRF401

satisfies the demands of wireless supervisor and permitting

license is unnecessary. nRF401 can convert standby state to

common one or transmitting state to receiving one.

According to real design demands, the control port

PWR_UP, CS, TXEN of nRF401 connects to SCM through

pull down resistance. So, when the corresponding port of

MSP430F149 is in input state, owing to pull down

resistance, the current consumption is nearly zero. [4]

Because SCM of MSP430F149 series automatically has

serial communication ports, it can be connected to

transceiver circuit of nRF401. Level transform is

unnecessary. The working frequency band of Radio

frequency module is set by the interface CS of serial

peripheral equipments of addition, through

adjusting bias resistance of RF_PWR port, radiated power

can be adjusted. The maximum radiated power can be

+10dBm. Also, the chip’s VCO circuit needs external

connection of VCO inductance whose value is 22nH and the

inductance is very crucial. Q>433MHz, the precision is 2%.

The wireless transceiver principle is shown as Figure 3.

ISL29000 working lighting intensity range is between

1lux and 10000lux, and can transfer it into currency;

outputting currency is proportional to receiving lighting

Figure 3. Wireless communication module.

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