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MSP430F169单片机矩阵键盘扫描程序，用一位共阳数码管显示(MSP430F169 microcontroller matrix keyboard scanning procedures, using a common anode LED display)

时钟程序的编写 这是基于89系列 适用于初学者(clock based on 89C51 you can make a clock by yourself if you want )

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.)

调用研华PCL数据采集卡进行采集数据例程，很容易理解，舍弃了繁琐功能！(Call Advantech PCL data acquisition card for data collection routines, it is easy to understand, abandoning the cumbersome features!)

说明：  51单片机控制GSM模块发短信和打电话的C源码(GSM single-chip control module 51 send text messages and phone calls the C source)

说明：  该源码实现51单片机之间符合modbus通信协议的通信(This code can achieve communications between MCS51 by modbus protocol. )

NTC热敏电阻计算器（B值、R25、指定温度、指定阻值均可计算，给定四个参数即可计算第五个参数）(NTC thermistors Calculator (B value, R25, specified temperature, the resistance can be specified calculation, four parameters can be calculated given the fifth parameter))

通过使用能。Keil 51工具和VC++来实现按键的功.(Achieved by using the Keil 51 tools and VC++ of the key functions.)

通过反转法循环扫描矩阵键盘，并通过数码管显示数据(By inversion method cyclic scan matrix keyboard, and through the digital display data)

connection的两种连通域方法，上传上去大家应该能看懂的，我从基础学的是能够看得懂，不懂得翻下书(The connection of the two methods of connected domain, uploaded you should be able to understand, I the foundation to learn is to be able to read, not understand through books)