这个是我以前单片机课程设计上我做的程序，希望对你有一定帮助。

要求：根据TD-PIT-B实验箱现有的实验电路，设计电路并编写程序使六个灯按照交通灯变化规律亮、灭或者闪烁。十字路口交通灯的变化规律要求：

（6） 南北路口的绿灯，东西路口的红灯同时亮30秒。

（7） 南北路口的黄灯闪烁3次，同时东西路口的红灯继续亮。

（8） 南北路口的红灯，东西路口的绿灯同时亮30秒。

（9） 南北路口的红灯继续亮，同时东西路口的黄灯闪烁3次。

（10） 转（11）重复。-This is my previous MCU design process I do hope you have some help. Requirements: According to the TD-PIT-B Experiment Box existing experimental circuit, circuit design and programming to make six changes of light according to the traffic light on, off or flashing. Changes of traffic lights crossroads requirements: (6) North-South crossing the green light, red light intersection at the same time something light for 30 seconds. (7) North-South crossing the yellow light flashes 3 times, and things continue to light the red light intersection. (8) North-South crossing the red light, green light while crossing things light for 30 seconds. (9) North-South crossing red lights continue to shine, while crossing the yellow light flashing thing 3 times. (10) transfer (11) repeat.