FX_keyreader

说明：  独居老人监控系统 使用80c51f020编程 具体的使用方法和接口，里面有(Elderly people living alone monitoring system using 80c51f020 programming methods and the use of specific interfaces, which has)

数字时钟显示时间、定闹钟及整点报时，还能实现时钟界面的切换功能(Digital clock displays the time, set the alarm and hourly chime)

详细描述了基于ADSP-21262的数字压限器的设计，给出了算法流程，可以根据其描述进行实现(A detailed description of the ADSP-21262 digital limiter based design, flow chart of the algorithm is given, according to the description of implementation)

射频技术 基于rc500的射频开发系统 频率稳定 不易失真(RF radio frequency technology development system based on rc500 frequency stability is not easy distortion)

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. .)

STM32F103驱动12864液晶程序，很适合于初学者，希望对你有用(12864 STM32F103 driver program, it is suitable for beginners, I hope useful to you)

32位单精度浮点数的乘加运算的C编程，感兴趣的可以看一下(Single-precision floating-point multiply-add operation of the C programming, interested can look at)

定义一个Circle类，有数据成员Radius（半径），成员函数GetArea（），计算圆的面积，构造一个Circle的对象进行测试。(caculation the area of a circle)

YL_3串行数码管显示时钟，74HC595，8位，显示时分秒，自动计数。(YL_3 serial digital display clock, 74HC595, 8 bit display minutes and seconds, automatic counting.)

当时间到时，蜂鸣器提醒，并有音乐提示。 时间可以自己设定，可以最小化到托盘。(time)