Research And Design Of The Vehicular Traffic Light Monitoring System Based On ZigBee

City intersection is a critical part of the traffic system,road traffic order primarily by traffic lights command,traffic lights installed in each crossing,in three colors: red,yellow and green lights transform to realize the intersection traffic command.In recent years,with the increasing urban traffic,the traffic pressure continues to increase,for the driver red and green lights,can appear be vehicle ahead,be obstacles such as the side of the road greening,billboards,and storms,snow,fog and other bad weather caused by poor visibility,prevent the drivers timely access to state of traffic lights,easy to cause traffic accidents,pose a safety hazard.In order to make the driver timely access to the front intersection traffic lights,reduce the security hidden danger,more convenient driving vehicles,combined with recent years the development of wireless network technology and sensor technology,this paper designed a vehicle traffic surveillance system based on ZigBee wireless network,have part of the whole system including the traffic light signal,launch part,receiving part,display parts,complete the crossroads information and lights state real-time transmission to the car terminal,allowing drivers to road condition be clear at a glance,to avoid interference.This design using ZigBee ad-hoc network technology,establishes the ZigBee traffic light network intersection,carry car terminal of the vehicle into the network covers to join the network automatically.The north and south direction due to the crossroads and light condition,on the other hand,a combination of the direction of the vehicle,the compass and sensors signal information on real-time access to current driving direction,in the car terminal displayed on the LCD panel and associated with speech,help the driver timely access to the front road traffic lights,control motor response ahead of time,have the effect of the auxiliary driving.In terms of hardware,part of traffic light signal using STC89C52 single-chip microcomputer control,ZigBee transmit and receive using CC2530 + power amplifier chip RFX2401 C consisting of ZigBee module,terminal display section using a serial port module,HMI intelligence add voice module implements voice broadcast,make the car terminal more humanization.Software is mainly for ZigBee protocol stack Z-stack transplantation and modification,the sensor code transplantation,for each interface design,as well as the man-machine interface design.The last of the measured system,the system monitoring accurate,can provide the driver with the signal light in the timely,accurate information.