单片机电子琴系统：

1.要求达到电子琴的基本功能，可以用弹奏出简单的乐曲。

2.用键盘作出电子琴的按键，每键代表一个音符。

3.各音符按一定的顺序排列，必须符合电子琴的按键排列顺序。

4.固定音乐播放有按键控制：“播放”、“弹奏/停止”。

5.弹奏电子琴时能播放出准确的声音，不弹奏时可以播放内置音乐。

-SCM organ systems:

1 required to achieve the basic keyboard functions, can play a simple song.

2 keyboard to keyboard keys, each key represents a note.

3 of the notes by a certain order, must comply with the order of keyboard keys.

4. Fixed a music player control buttons: "Play," "play/stop."

5 play the keyboard when playing the exact sound, not built-in music player can play.