键盘复用与显示公用一个I/OK口，键盘复用与显示公用一个I/OK口...

单片机常用子程序， 单片机常用子程序-Subroutine used single-chip, single-chip common subroutine, microcontroller used subroutine

RS-485接口具有较强的抗干扰性，数据传输的距离较远，在一些应用中常常需要把RS-232标准的信号转换为RS-485的标准信号进传输。图中所示电路允许数据在RS-232/RS-485这两个不兼容的串行数据接口间传递。传输速度为480波特时，传输距离可达1750米。图中双RS-232收发器IC1将主机(PC)输出的RS-232电平转换为TTL电平，驱动高速RS-485收发器IC2 的输入，倒相器使IC2、IC3在受到起始位时被激活。-RS-485 trying to lay all the thoroughly bleed at the nose picking up the birthday 扰 fern cavity 强 ， Chu Huai basin cavity beat escapement for the birthday candle远Now ， Which instance, using Beckmannia中

早期开发的PC与ms8051串行通讯程序源码-Early development of the PC and serial communication program source ms8051

Electronic Voltimeter with assembly for motorola with three 7 segment display

这是一本关于Protel2004的教程,详细介绍了如何使用该软件绘制电路图和PCB板-This is a tutorial on Protel2004 details on how to use the software rendering circuit diagram and PCB board

此程序是用CYPRESS单片机编写，功能是将电压信号转换为PWM信号-This procedure is used to prepare Singlechip CYPRESS, function is the voltage signal is converted to PWM signal

Can convert midi to rtttl

基于等精度测频原理，设计的等精度频率计，测试结果很精确，达到0.01HZ。-Such as the accuracy of frequency measurement based on the principle of design, such as precision frequency meter, test results are accurate to 0.01HZ.

MEGA16的小车沿黑线行驶程序，能够控制程控小车沿规定路线自行行使。-MEGA16 the black car along the lane, it will be programmed control along the trolley line provides free exercise.

本程序是基于FM1702的射频卡读写器的单片机控制的C语言程序，所用单片机为AT89C52.-This procedure is based on the FM1702 RF card reader control of single-chip C-language program, using single-chip microcomputer for the AT89C52.