用单片机进行定时交通信号灯控制，以模拟方式从方法上进行说明，每组有绿、黄、红3支共两组发光二极管表示交通信号灯。-Carried out using single-chip timing control of traffic lights to simulate the way from the methods described, each has green, yellow, 3 red light-emitting diodes, said a total of two sets of t