本实验中主要应用单片机的端口操作及延时（通过每条指令执行时间来延时）循环程序。首先需要知道如何让一个发光二极管工作，当在它的A和K两个电极加上合适的电压的时候，它就会亮起来。-In this study, the main application microcontroller port operations and delay ( delay) of each instruction execution time cycle program . First need to know how to make a light-emitting diode , when coupled with the appropriate voltage in the A and K electrodes , it will light up .