通过修改程序，控制八盏灯的亮灭状态。(实验指导书P30-36)

控制流水灯每次亮2盏，循环左移、右移

DS1、DS3、DS5、DS7半亮，其余的全亮。

DS1亮1/8，DS2亮2/8，DS3亮3/8，DS4亮4/8，DS5亮5/8，DS6亮6/8，DS7亮7/8，DS8全亮-By modifying the procedures, controls eight bright lights out of state. (Experimental instructions P30-36) control the flow of each light two lights, the left circle, shifted to right DS1, DS3, DS5, DS7 semi-bright light the rest of the whole. DS1-liang 1/8, DS2-liang 2/8, DS3 bright 3/8, DS4-liang 4/8, DS5 light 5/8, DS6 bright 6/8, DS7 light 7/8, DS8 full light