说明：  平时实验板执行流水灯功能，当按下K5（INT0）以后，蜂鸣器发声，流水灯暂停，中断过后，继续流水灯功能
(Experimental implementation of normal water board lights feature, when pressing the K5 (INT0) after the buzzer sound, water lights suspended after the interruption and continue to water lamp function)