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- 用固定频率的方波驱动蜂鸣器,共16种音调;在蜂鸣器发出不同音调的同时,LED发光以二进制数字形式指示,当前音调的编号(1~16)-The buzzer is driven with a fixed frequency square wave, a total of 16 kinds of tone sounds of different tones at the same time, buzzer, LED light to binary digital indicator, the tone