LED大屏幕显示系统，以AT89S52单片机为核心，由键盘显示、录放音模块、光电开关、温度采集、定时闹铃、LED大屏幕显示等功能模块组成。-LED large screen display system to AT89S52 Single-chip as the core, from the keyboard display, audio playback module, photoelectric switches, temperature acquisition, timing alarm, LED large-screen display function module.