TQ2440利用蜂鸣器唱歌

特点：大家对照着乐谱将自己喜欢的歌曲按照作者写的规则（很简洁的），一个个的音符写进一个数组里面就可以自定义自己喜欢的歌曲了

-TQ2440 use the buzzer to sing features: music to everyone according to their favorite songs written by the author in accordance with the rules (very simple), one of the notes included in an array which you can customize your favorite songs