文件名称:cross
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（1）用微机原理实验箱FD-8088提供的数码管和芯片做。
（2）假设有一个十字路口，1，3为南北方向，2，4为东西方向，每个路口各有红、黄、绿三个交通信号灯。
（3）用红黄绿三个彩色发光二极管模拟控制交通信号。红、黄、绿灯接通时间分别为5秒、2秒、5秒。
-(1) Microcomputer Principle Experiment Box FD-8088 provides digital control and chip done. (2) It is assumed that there is a crossroads for the north-south direction 1,3, 2,4 for the east-west direction, each intersection have red, yellow and green three traffic lights. (3) with red, yellow, and green three color light-emitting diode analog control traffic signals. Red, yellow and green respectively connected to 5 seconds, 2 seconds, 5 seconds.
（2）假设有一个十字路口，1，3为南北方向，2，4为东西方向，每个路口各有红、黄、绿三个交通信号灯。
（3）用红黄绿三个彩色发光二极管模拟控制交通信号。红、黄、绿灯接通时间分别为5秒、2秒、5秒。
-(1) Microcomputer Principle Experiment Box FD-8088 provides digital control and chip done. (2) It is assumed that there is a crossroads for the north-south direction 1,3, 2,4 for the east-west direction, each intersection have red, yellow and green three traffic lights. (3) with red, yellow, and green three color light-emitting diode analog control traffic signals. Red, yellow and green respectively connected to 5 seconds, 2 seconds, 5 seconds.
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