LED七段数码管数字钟：

1．设计并完成LED七段数码管数字钟电路。

2．数字钟显示格式为：HH：MM：SS。

3．具有通过键盘能够调整时、分、秒的功能。

-Seven-Segment LED digital tube digital clock: 1. Design and completion of Seven-Segment LED digital tube digital clock circuit. 2. Digital clock display format: HH: MM: SS. 3. With a keyboard can be adjusted through the hours, minutes and seconds functions.