数字日历时钟，1．　　数码管显示：秒、分、时（可同时显示，也可轮换显示）

2．　　能够设置时间，“设置按键”数量不限，以简单合理易用为好。

3．　　误差：1秒／天（报告中要论述分析是否满足要求）



扩展

1．　　设置校准键：当数字钟显示在“整点±30秒”范围时，按动“校准键”，数字钟即刻被调整到整点，消除了±30秒的误差。

2．　　加上“星期”显示（可以预置），并可以对其进行设置。

-Digital calendar clock, 1. Digital display: seconds, minutes, hours (can be displayed simultaneously, can also be rotated to display) 2. Be able to set the time, " Setting button"　limited quantity, with a simple and reasonable to use as well. 3. Error: 1 second/day (to be discussed in the report meets the requirements analysis) extension 1. Set the calibration key: When the digital clock is displayed when " the whole point of 30 seconds,"　range, press " Calibrate button" , the digital clock is adjusted to the whole point instantly, eliminating the 30 seconds of errors. 2. Plus " week"　shows (can be preset), and can be set up.