电路通过数码管显示实验，定是实验，流水灯实验的结合来模拟交通灯控制系统，其中六个数码管两个一组分成三组，分别代表三个路口，发光二极管P0.0~P0.7,P2.7这九个发光二极管分成三组，也分别对应三个路口。这样定时30s来控制三个路口的车辆的红绿灯的亮暗。-The circuit through digital tube display experiment, given a combination of experimental light water experiments to simulate the traffic light control system, including two group of six digital tube divided into three groups, representing the three junctions, light-emitting diodes P0.0 ~~ P0. 7, P2.7 nine light-emitting diode is divided into three groups, respectively, corresponding to the three intersections. So timed 30s three junctions to control vehicle traffic lights bright and dark.