Matrix-keyboard-lock

使用51单片机，用其内部定时中断，和外部中断只找一个可控脉宽调制信号PWM(Using 51, with its internal timer interrupt, and external interrupt only to find a controllable pulse width modulation signal PWM)

the function of the code is like a calculator.Basic calculator may be build by the code.

用单片机对遥控器实现解码，并在数码管上显示(Infrare Decoder)

基于c51单片机的74ls373芯片无限拓展功能的源代码，（学院里写的）(Based on 74 c51 ls373 chip infinitely function source code, written in the (college))

菜单编程操作的源代码，有助于对菜单的理解。。(Menu programming operation of the source code, contribute to the understanding of the menu. .)

24CXX的读写代码,适用于于51单片机SCM.可直接使用。 (24CXX the read and write code, suitable for 51 MCU the SCM can be used directly.)

说明：  100% 可以运行的温湿度显示软件，数据保存在数据库之间的通信 串口通信(100% operational temperature and humidity display software, data stored in the database communication serial port)

【AVR + Proteus】数码管显示两路AD转换结果([AVR+ Proteus] digital display two way AD conversion result)

ADS 0.18um library which have all kind of mosfet you need

1000以内所有的完数，比较简单，用于学习和交流(1000 all finished within few, relatively simple, for learning and communication)