English
To realize the automatic control of the above traffic signal lights, the control circuit is required to be composed of a clock signal generator, a counter, a main controller, a signal lamp decoding drive circuit and a digital display decoding drive circuit. The principle block diagram of the whole circuit is shown in the figure. The four intersections are equipped with red, yellow and green lights and two digit 8421BCD code counting and decoding displays.Chinese
为了实现上述交通信号灯的自动控制，控制电路需要由时钟信号发生器、计数器、主控制器、信号灯解码驱动电路和数字显示解码驱动电路组成。整个电路的原理框图如图所示。四个十字路口配备了红、黄、绿灯和两位8421BCD码计数和解码显示器。
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