RESEARCH OF TRAFFIC SIGNAL LIGHT INTELLIGENT  
CONTROL SYSTEM BASED ON MICROCONTROLLER  
 March 2009  

A development of distributed area traffic signal lights control based on single- chip  microcontroller   through  CAN  BUS   is   described.   With  the   core   of  AT89C51, infrared receiver receives the infrared signal coming from launcher.  

The demodulation signal is treated by single-chip microcontroller. The singlechip  microcontroller  controls  the  CAN  BUS  controller  to  structure  CAN  BUS  communication  system  to  transmit  the  data.  The  designator  of  distributed  traffic signal lights intelligent control system was carried out by three control styles of vehicle flux,remote and PC.  

The  paper  introduces  total  scheme  and  system   structure,  also  the  hardware design of the system in detail. By experimental testing, when the key K1-K6 is pressed  ,time  setting  of  east-west,south-north  direction,  emergency  car, timepsilas increase ,decrease ,holding are effectively controlled.  

When the  low -level time  of WDI is  continuous  greater than  1.6 s, the RESET port of watchdog produces  negative  overflow  pulse  signal lasting  200  ms  to reset AT89C51.The design demands of system are all satisfied.  

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