在51单片机系统中实现CRC校验的方法，以及CRC校验的原理

随着精准农业的发展，农业种植和农业研究人员需要一种手持式NDVI测量仪，以便对农作物长势进行定量测量。本文讨论了一种手持式NDVI测量仪的完整设计过程，详细论述了设计原理，并给出了详尽的单片机程序、设计电路原理图及PCB图。该NDVI测量仪采用太阳光作为光源，光电探测器采用滤光片和光敏二极管实现，用AT89C51单片机控制。其具有结构简单、成本低、轻便、低功耗的特点。-With the development of precision agriculture and farming, and agricultural researchers need a handheld NDVI measuring instrument, in order to crop growth for quantitative measurement. This paper discusses a handheld meter NDVI the integrity of the design process, discussed in detail the design principles, and gives a detailed SCM procedures, circuit schematics and PCB plans. The NDVI measuring instrument used sunlight as a light source, photodetector using filters and photodiode realized, with AT89C51 control. Its structure is simple, low cost, lightweight, low-power characteristics.

32位arm9微处理器S3C2410的lcd彩色液晶屏测试源代码-32-bit ARM9 microprocessor S3C2410 the lcd color LCD screen test source code

1.电子琴功能 用实验板上K1~K7作为电子琴的7个按键，每个按键对应一个音符要求当按下其中一个按键，就通过P2.5口输出对应频率信号使蜂鸣器发出特定音符声音。 2.乐曲演奏 若按下K8键，完成自动弹奏“送别”歌曲。 -1. Organ function of the experimental board K1 ~ K7 as the organ of the seven buttons, each button corresponds to a note of which require that when the press of a button, on the adoption of P2.5 port output frequency signal corresponding to a specific note to the buzzer sounds . 2. Music playing, if pressed K8 button to complete the auto-play " Farewell" songs.

直流电机闭环控制C程序，包括方向、转速的控制和补偿算法等-C closed-loop DC motor control procedures, including direction, speed control and compensation algorithms, etc.

控制电机的程序，pwm控制速度程序等等都有-Motor control procedures, pwm speed control procedures, and so on have

单片机小精灵是一款单片机辅助开发工具，提供常用51系列单片机的参数计算和资料查询功能。 -Microcontroller is a Microcontroller Pac-assisted development tools, providing popular 51 series microcontroller parameters and data query capabilities.

采用8位LED动态扫描时钟演示程序 使用12MHZ晶振，P0口输出段码，P2口作列扫描，用共阳LED数码管-Using 8-bit LED Dynamic scan demo program using the 12Mhz clock crystal, P0 port output above code, P2 I make out scanning, with a total of Yang LED digital tube

自制AT89S51编程器教程 编程器制作包 1.1 修正了电路两处错误。 编程器制作包 1.2 增加了一个下载线调试程序-homemade AT89S51 programmer Programming Guide for the production of 1.1 amendments circuit two errors. For production programming packages increased by 1.2 download a line debugger

mega16 实现的控制舵机的程序，在winavr20080610上编译通过，用户可自己制作makefile函数在winavr上编译使用-realize mega16 steering gear control procedures, in winavr20080610 compiled through, users can produce their own makefile function winavr compiled using

8*8点阵led显示功能介绍，包括点阵构成的原理，显示一竖柱，显示一横柱-8* 8 dot matrix led display, including the principle of dot-matrix composition, show一竖column, showing a horizontal column