基于AT89S51单片机的电子琴，Keil软件，能够发21个音，可以播放已经存储了的音乐，能够选择音色（音色部分为外围电路设计），人机界面友好-AT89S51 microcontroller-based electronic keyboard, Keil software, to send 21 tones, you can play the music already stored, to select a tone (tone part of the peripheral circuit design), friendly interface