modbus 通讯程序 物理层rs

针对AVR单片机开发的嵌入式操作系统，此操作系统具有独特的TCP/IP协议栈。-AVR for single-chip embedded operating system development, the operating system has a unique TCP/IP protocol stack.

51单片机读写SD列子程序 可以学习51单片机如何读写SD卡-51 Singlechip Liezi SD procedures to read and write can learn how to read and write 51 Singlechip SD Card

采用80C51单片机为控制核心，利用超声波传感器检测道路上的障碍，控制电动小汽车的自动避障，快慢速行驶，以及自动停车，并可以自动记录时间、里程和速度，自动寻迹和寻光功能。-80C51 single-chip microcomputer used for the control of the core, the use of ultrasonic sensors detect obstacles on the road, control of electric cars automatic obstacle avoidance, fast low traffic speeds, as well as the automatic parking, and can automatically record time, mileage and speed, automatic track finding and searching optical function.

学习51单片机必备的一些C语言基础知识，对C语言不熟悉的朋友会有一定的帮助-51 Singlechip necessary to learn some basic knowledge of C language, on the C language are not familiar with our friends will help

24c16读写程序，I2C总线的，我试过，可以使用-24c16 literacy procedures, I2C bus, I tried to use

介绍一种高分辨率的双路A/D转换器AD7711，能满足双路A/D采样要求。内容包括AD7711的特点， 内部寄存器结构和外部接口，并详细阐述了数据采集系统中AD7711与单片机AT89S8252的接口技术，包 括硬件接口电路和软件程序设计及其注意事项。 -Introduce a two-way high-resolution A/D converter AD7711, can satisfy the dual A/D sampling requirements. Include the characteristics of AD7711, the internal register structure and the external interface, and detailed data acquisition system with the AD7711 single-chip AT89S8252 interface technologies, including hardware interface circuit and software design and its attention to matters of procedure.

51的键盘扫描程序,与原来的扫描方式不同,这种方式可以处理多键同时按下.-51 keyboard scanning procedures, with the original scan different ways, this approach can handle multi-button pressed together.

液晶ATM12864D的驱动程序，应该也可以驱动其他类似的12864液晶，绝对精简，只含ASCII码显示，汉字可自己写，我开发的系统就是用的这个驱动，很实用-ATM12864D LCD driver should be able to drive other similar LCD 12864, absolutely streamlined, containing only ASCII code display, to write Chinese characters can be their own, I developed systems that use this driver, it is practical

51单片机P2口接4*4键盘的行线和列线；红灯亮时进行频率输入；绿灯亮时进行占空比输入；频率值暂定在100到60KHZ之间；输入频率和占空比时要输够六位整数，不够的在前面补0；占空比以百比数（0-100）形式存在。-51 Singlechip P2 mouth then 4* 4 keyboard line and column line red light when the frequency of input green when the input duty cycle frequency value is tentatively scheduled for between 100 to 60KHZ input frequency and duty than enough to lose six integers, not enough to fill in front of 0 duty cycle than a few hundred (0-100) form.

1602测试-1602 test