ABSTRACT
Traffic signal lights have been around for years and are used to efficiently control traffic through intersections. A traffic signal light is used to control vehicles and passengers so that traffic can flow smoothly and both drivers and passengers are safe. The growing use of traffic lights attests to their effectiveness in directing traffic flow, reducing the incidence of accidents, Therefore, Application of traffic lights is very important. Study of traffic lights is also necessary.
In this design, the traffic light is based on AT89S51, The system is composed of several modules such as MCU、LED countdown timing and traffic light display etc. Realized mouth has established the function through AT89S51 the chip P1 which red,the green light lightened, through chip P3.0、P3.1 input, output establishment demonstration time。 The traffic light lightens uses the light emitter diode realization, the time demonstration uses seven section of nixie tube realizations.The monolithic integrated circuit system uses direct-current power supply.For system stable reliable. avoided the system because of dying machine the knock off situation occurrence.