模仿电话拨号，并且有晶体管显示输入的数字-Imitation of dial-up, and there are number of transistors display input

经典模式流水灯实验，拨码开关SW3作为开关信 号，导航按键UP和DOWN作为LED流动方向控制信 号，实现8个LED开关、方向可控的流水灯功能。-Classic mode flow lamp experiment, dial the code switch SW3 as a switch letter Number, navigation buttons UP and DOWN as the LED flow direction control letter 8, to achi