超声波51测距离

说明：  1．管理信息系统（学生成绩） 两种用户等级：管理员和用户，均用用户名和密码登陆，通过识别不同类型的用户名，进入不同的操作界面。 1) 管理员功能： i 用户管理：增加、删除用户； ii 记录录入、修改、删除 iii 查询：单项查询、多项查询、范围查询 iv 分类统计：提供有代表性的统计结果 2) 用户功能： a) 修改密码 b) 查询本用户信息 c) 修改个人信息(1. Management Information System (student performance) two user levels: administrators and users use a user name and password, by identifying different types of user name, into a different interface. 1) The administrator function: i user management: add, delete users ii record entry, modify or delete iii Inquiry: individual inquiries, a number of inquiries, the scope of inquiry iv classification statistics: to provide a representative statistical results 2) user features: a) Change Password)

说明：  两电平SVPWM调制代码，用于DSP28335(two-level SVPWM code)

一个很好的winsock tcp/ucp示例，相信看了肯定收益颇丰(a good example for winsock about tcp/udp)

利用stm32的adc1，实现规则转换，检测通道pa6和pa7的电压值，并把他们的值放在数组中。串口显示数据方便调试。(Use stm32 the adc1, implement rules conversion, detection channel pa6 and pa7 voltage value, and put their values ​ ​ in an array. Serial display data to facilitate debugging.)

指纹识别加门控，用于校车工作人员职能监管，当且仅当司机和管理员指纹配对正确后，校车才能启动；汽车停止后管理员指纹识别成功后，车门打开；(Fingerprint identification and gating for the school bus staff supervision functions, if and only if the driver and administrators fingerprint matching, right bus can start After the success of the car to stop after the administrator fingerprint identification, the door opened )

pic 12f508 ad转换器 ，PWM控制器，单片机控制(pic 12f508 PDF)

ANTENNA THEORY AND DESIGN Revised Edition Robert S. Elliott University of California Los Angeles, California(First published in 1981, Robert S. Elliott s Antenna Theory and Design is one of the most significant works in electromagnetic theory and applications. In its broad-ranging, analytic treatment, replete with supporting experimental evidence, Antenna Theory and Design conveys fundamental methods of analysis that can be used to predict the electromagnetic behavior of nearly everything that radiates. After more than two decades, it remains a key resource for students, professors, researchers, and engineers who require a comprehensive, in-depth treatment of the subject. In response to requests many of our members, IEEE is now reissuing this classic. Newly revised, it once again will be an invaluable textbook and an enduring reference for practicing engineers. The IEEE Press Series on Electromagnetic Wave Theory offers outstanding coverage of the field. It consists of new titles of contemporary interest as well as reissues and revisions of recognized classics by established authors and rese)

STM32学习版定时器控制，里面包含解释说明，以及引脚配置(STM32 timer control)

C++ implementaion for RSA together with the Wiener attack. It uses NTL library for big numbers

关于数据转换的很好的C语言程序，很好用，很实用(Data conversion on the C language program good, very good, very practical)