可以对图书馆借还书系统进行管理，任意添加书籍，与下位机51单片机可以通信，模拟IC卡借还书-Manage the library to borrow books system, add any books, and lower machine 51 MCU communication, analog IC card borrowing and returning books

用51单片机模拟的PWM波，控制加热器装置-With 51 analog PWM wave to control the heater unit

由键盘控制的、基于51单片机的、有时间显示的、模拟数码管交通灯-Controlled by the keyboard, based on 51 single-chip, time display, analog digital traffic lights

基于stm51 单片机的数模转换程序可以实现从数字量到模拟量的转换程序 改程序是基于51单片机的程序(Stm51 microcontroller based digital to analog conversion process, you can achieve from digital to analog conversion process Change the program is based on 51 single-chip procedures)