通过编程来实现单片机I/O口对LED的控制，使流水灯显示上下流动、停止流动、闪灯等功能，并由按键控制流水灯的不同亮法，LED的工作方式通过键盘的扫描实现。其中的LED采取共阴极接法，通过依次向连接的LED的I/O口送出低电平来实现

LED的点亮。-Programmed to achieve single-chip I/O port for LED control, so water light show upward and downward flow, stop the flow, flashing lights and other functions, by different keys to control water lamp light method, LED work through the keyboard scan implementation. Wherein the LED adopt common cathode connection, in order to connect the LED via an I/O port sends low level to achieve

LED lighting.