单片机制作的测速计源程序，发上来和大家分享分享，仅共参考...

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

AVR单片机实现SPI通信完整源码,可直接拿过来用了-AVR MCU SPI communication complete source code, as it can be spent

s3c44b0x和ch375读写U盘程序-s3c44b0x ch375 and U disk read and write procedures

包括读卡器源代码，专为研究RFID技术学习之用-Philips makes no warranty, expressed, implied or statutory, including but * not limited to any implied warranty of merchantability or fitness for any *particular purpose, or that the use will not infringe any third party patent,* copyright or trademark. Philips must not be liable for any loss or damage * arising from its use.

数字电压表,可模拟进行电压测量,用数码管显示电压值,有图和程序-Digital voltage meter, can be simulated for voltage measurement, digital display voltage value, a plan and procedures

关于电子热表的单片机原程序，该程序是利尔达公司在沈阳的技术研讨会上宣讲的例程-hot on the electronic table of SCM original program, which is the cellphone company in Shenyang technical seminar lectures on the routines

51单片机的上网实现,上网程序清单C51-浮点运算功能-51 MCU web, Internet list of procedures C51-floating point performance

用途：1。打开电子表格文件——全部选中——两份。切换到程序——全部选中——粘贴3。选择匹配：四个匹配条件。输出选项：创建五个项目合并的意愿。单击按钮“保存”--结束。欢迎来到：www.digitalu think.go.nease.net

DS1302时钟:综合应用定时器中断溢出,串口通信 实验现象: 每隔4SPC机得一时间,十六进制格式-DS1302 Clock: integrated application timer overflow interrupts, serial communication experimental phenomenon: every 4SPC machine was a time, in hexadecimal format

语音芯片PM50八方源代码，在播音函数中写入你需要播音的例子即可播放对应的语音。-voice chip PM50 from all source code, the audio function you need to write radio broadcast of examples corresponding voice.