用单片机键盘模拟播放MP3，音箱采用PC机自带的。按下键盘1，播放音乐1，按下键盘2，播放音乐2。按下键盘前，VB界面上弹出滚动屏，显示欢迎词，欢迎学生单片机。-Simulate the keyboard player with MCU MP3, using PC-native speakers. Press the keyboard 1, play music, one, two by pressing the keyboard, play music, 2. Press the keyboa