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 top-down flow of the interval in which each tube light 1s 500ms, OFF 500ms, lit off the buzzer when the buzzer off, has been repeated down.