交通信号灯控制器的设计 本设计应用基本数字电路知识，采用LED灯作红、绿、黄三交通灯，用七段数码管作同步倒计时显示。实现两方向通行时间不相等的控制并配有倒计时。-Traffic signal controller design basic digital circuits of the knowledge of design applications, the use of LED lights for red, green, and yellow traffic lights, for synchronized with the seven-segment LED countdown display. Two directions to achieve passage of time does not equal control and with the countdown.