8个发光管由上至下间隔1s流动，其中每个管亮500ms,灭500ms,亮时蜂鸣器响，灭时关闭蜂鸣器，一直重复下去-8 LED interval 1s flows from top to bottom, in which each tube light 500ms, off 500ms, when the buzzer sounds bright, turn off the buzzer off, has been repeated down