Telephone the working principle, has ringing circuit, Phone polarity protection...

工业仪表常用到4-20mA输出此程序通过C51单片机模拟输出PWM 提供了很好的思路和事例-Industrial instrumentation commonly used to 4-20mA output of this program through the C51 single-chip analog output PWM provides a good example of ideas and

485通信在工业控制及管理系统中应用非常广泛，但485总线的相关资料教材上说明的却非常泛泛，这些资料对485通讯做了详细介绍，并有应用案列，相信对朋友们很实用-485 Communication in industrial control and management system is widely used, but the 485 bus information materials on the description is very general, such information on the 485 made a detailed presentation and have applied the case of columns, I believe that friends are very practical for

基于8051的单片机时钟源代码，可实现时间设置，闹钟等-Based on the 8051 single-chip clock source code, can be set-up time, alarm clock, etc.

SIGMA-DELTA 原理 实现的用LPC900系列单片机的比较器实现16位A/D。 有详细的说明和源代码（汇编格式，但是可以在KEIL下的C中调用）。-SIGMA-DELTA principle achieved using the LPC900 Series compared to 16-bit A/D. A detailed description and the source code (the compilation format, but in the C KEIL Calling).

英飞凌C166之XC164CS定时器程序-Infineon C166

AVRMEG32编写的一个项目代码,里面包含一般应用的模块.-AVRMEG32 the preparation of a project code, which contains the general application of the module.

18B20的程序 大家分享 刚刚接触的可以看看 挺有帮助的-18B20 procedures to share with you just contact can look at quite helpful

新编万年历星期速算法C语言的实现-speed algorithm C implementation

gb2312到unicode转换的文件，用在AVR里面估计占比较大的Flash空间-gb2312 to unicode conversion of documents, used in AVR inside the larger proportion is estimated Flash space

HT1622头文件，HT1622液晶显示模块底层函数 -HT1622 header files