以单片机为核心设计一个电子琴，具有自动播放乐曲和弹奏乐曲的功能。设定开关/按钮K1、K2和K3。开关/按钮K1打开或关闭自动播放乐曲1；开关/按钮K2打开或关闭自动播放乐曲2；开关/按钮K3为手动弹奏乐曲。用21个按键开关来分别控制产生低音“1、2..7”、中音“1、2、..7”和高音“1、2、..7”。-To design a single chip as the core keyboard, automatically play music and play with music features. Set the switch/button K1, K2 and K3. Switch/button to open or close automatically K1 music player 1　switch/button to turn on or off K2 Auto Play Music 2　switch/button to play music K3 for the manual. 21 keys with a separate control switch to produce bass " 1,2 .. 7" , Alto, " 1,2, .. 7"　and the treble, " 1,2, .. 7."