用51单片机控制的LED闹钟，可显示时间和日历，有秒表功能，用闹钟功能，还有音乐闹铃。文件里包含电路图，大家使用的引脚不同，可以比照图修改。-51 MCU control with LED alarm clock that displays time and calendar, stopwatch function, with alarm clock function, and music alarm. File contains the circuit, we use the pin will