包含多个单片机功能开发由C语言编写源程序，适合初学者入门学习，led灯点亮，数码管显示，独立按键，矩阵键盘的使用，程序注释详细-Contains multiple single-chip function developed by C language source code, suitable for beginners introductory study, led light, digital tube display, independent key, the use of matrix