该文件夹主要摘录了自己以前在C51单片机上编写的DS1802、MAX118、MAX7219、测量放大器、超声波、串口通信、数字时钟的C代码-Extract the main folder of their own before the preparation of the C51 single-chip on the DS1802, MAX118, MAX7219, measuring amplifiers, ultrasound, serial communication, digital c