1．基本实验

以扩展实验箱上的74LS273做为输出口，控制八个发光二极管亮灭，模拟交通灯管理。

2. 扩展实验

在基本实验基础上加入左转弯信号灯。

-1. Basic experiments to extend the experiment for me on the 74LS273 output control of eight light-emitting diode light out, simulating the management of traffic lights. 2. To expand the experimental basis of the basic experiment by adding left turn signal.