a)实现时钟功能，可以在两个七段数码管上显示秒钟时间或者分钟时间，用一个开关控制两者的切换。

b)实现闹钟功能，时间到播放一段音乐，并在发光二极管上播放走马灯图案，在双色点阵发光二极管上滚动显示自己的学号。能控制滚动显示的速度以及音乐播放的速度，且用一个开关控制闹钟的开关。-a) achieve clock function, can be in two seven-segment digital tube display seconds or minutes, with a switch control to switch between the two. b) to achieve clock function, time to play some music, and play a revolving door in the light-emitting diode design, the two-color LED on the scrolling dot matrix display their student number. Can control the speed of scrolling display and music playback, and alarm clock with a switch control switch.