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Description: 这个例子做的是去年全国电子电子设计大赛E题，悬挂运动控制系统（E题），我只做了画线和画圆两个部分，纯粹是玩，所以精度不是很高，终点定位精度误差差不多0.5cm左右，画圆在两个斜率无穷大区误差较大需要修正。
一开始我用的是L297+L298驱动，感觉脉冲相位控制比较麻烦，后来想到avr相对51的速度，用B口模拟脉冲，L293驱动。电机我用的是两个42BYG四相八拍六线步进电机，资料很好找。
这个试验做起来可能有点麻烦，比赛的时候需要特定的板子，就象附件E题里所示，注意电机转动的时候不能让绕线重叠，会严重影响精度，绳子要用无弹性的，我用的是去渔具店买的尼龙的无弹性渔线。
-this example so last year's national electronic Electronic Design Competition E. issue, the hoisting of Motion Control System (E) by I only went for the painting and the Circle Line 2, purely for fun, and so accuracy is not very high, end positioning accuracy error of almost 0.5 cm, the two Circle infinite slope of the error greater need for the amendment. I started with one of the L297 L298-driven, phase-control pulse feeling more trouble Later thought 51 avr relative speed, I simulated B pulse, L293-driven. I used the motor is BYG 4 2 42 8 shoot six phase stepper motor line, looking for good information. The pilot may have made up trouble, competitions specific needs of the board, as that Lane Annex E, as shown in attention to the motor rotation can not let Wound overlap, will seriou
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Author: xuepeng |
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Description: tft lcm display-tft display clause 8 cm
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Author: jason |
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Description: 本规约手册汇集了国内远动设备最常用的五种规约：新部颁 CDT 规约（ DL451 91 ）、武汉 CDT 规约 (DCF 5 ) 、CI1801 规约、IEC870-5-101 规约，另外还有 DF1000 与笔记本、后台机通讯规约。
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Author: 阿峰 |
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Description: 很好的,装置中阅读器、应答器均具有无线传输功能，频率和调制方式自由选定。不得使用现有射频识别卡或用于识别的专用芯片。装置中的耦合线圈为圆形空芯线圈，用直径不大于1mm的漆包线或有绝缘外皮的导线密绕10圈制成。线圈直径为6.6±0.5 cm（可用直径6.6 cm左右的易拉罐作为骨架，绕好取下，用绝缘胶带固定即可）。线圈间的介质为空气。两个耦合线圈最接近部分的间距定义为D。
阅读器、应答器不得使用其他耦合方式
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Author: liyue |
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Description: 灰色预测模型称为CM模型，G为grey的第一个字母，M为model的第一个字母。GM（1，1）表示一阶的，一个变量的微分方程型预测模型。GM（1，1）是一阶单序列的线性动态模型，主要用于时间序列预测。 一、GM（1，1）建模 设有数列 共有 个观察值 对 作累加生成，得到新的数列 ，其元素 （5-1） 有： 对数列 ，可建立预测模型的白化形式方程， （5-2） 式中： ——为待估计参数。分别称为发展灰数和内生控制灰数。设 为待估计参数向量 则 按最小二乘法求解， 有： （5-3） 式中： （5-4） （5-5） 将（5-3）式求得的 代入（5-2）式，并解微分方程，有 （1，1）预测模型为： （5-6）-gray forecasting model called CM model, the G-gray of a letter, the M model for the first letter. GM (1,1), a band of a variable type of differential equation models. GM (1,1) is a sequence of single-band linear dynamic model, mainly for time series prediction. A GM (1,1) model series with a total value of observation for the cumulative production, to a new series of its elements (5-1) : The series, we can establish the prediction model albino form of equation (5-2) where : -- to question the estimated parameters. The development will be known as the gray and hygiene control within a few gray. Set parameters to be estimated according to Vector least squares method, are : (5-3) where : (5-4) (5-5) (5-3) that obtained in lieu of income (5-2) - and solutions differential equations, (1 1) Fore
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Author: 罗军 |
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Description: SOFTWARE ENGINEERING
Published by McGraw-Hill, an imprint of The McGraw-Hill Companies, Inc. 1221 Avenue of the
Americas, New York, NY, 10020. Copyright/2001, 1997, 1992, 1987, 1982, by The McGraw-Hill Companies,
Inc. All rights reserved. No part of this publication may be reproduced or distributed in any
form or by any means, or stored in a database or retrieval system, without the prior written consent
of The McGraw-Hill Companies, Inc., including, but not limited to, in any network or other electronic
storage or transmission, or broadcast for distance learning.
This book is printed on acid-free paper.
1 2 3 4 5 6 7 8 9 0 DOC/DOC 0 9 8 7 6 5 4 3 2 1 0
ISBN 0073655783
Publisher: Thomas Casson
Executive editor: Betsy Jones
Developmental editor: Emily Gray
Marketing manager: John Wannemacher
Project manager: Karen J. Nelson
Production supervisor: Heather Burbridge
Coordinator freelance design: Keith McPherson
Supplement coordinator: Rose Range
New media: Christopher Styles
Cover design: Rhiannon Erwin
Cover illustrator: Joseph Gilians
Compositor: Carlisle Communications, Ltd.
Typeface: 8.5/13.5 Leawood
Printer: R. R. Donnelley & Sons Company
Library of Congress Cataloging-in-Publication Data
Pressman, Roger S.
Software engineering: a practitioner’s approach / Roger S. Pressman.—5th ed.
p. cm.— (McGraw-Hill series in computer science)
Includes index.
ISBN 0-07-365578-3
1. Software engineering. I. Title. II. Series.
QA76.758.P75 2001
005.1—dc21
00-036133
http://www.mhhe.com
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Author: zhangguangyun@gmail.com |
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Description: 本规约手册汇集了国内远动设备最常用的五种规约：新部颁 CDT 规约（ DL451 91 ）、武汉 CDT 规约 (DCF 5 ) 、CI1801 规约、IEC870-5-101 规约，另外还有 DF1000 与笔记本、后台机通讯规约。-Manual collection of this Statute domestic Telecontrol Equipment Statute five most commonly used: New Ministerial CDT Statute (DL451
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Size: 449536 |
Author: 阿峰 |
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Description: 超声测距精确度相当高！超声波测距电路设计+测量距离30-1000cm-Ultrasonic Ranging accuracy is very high! Ultrasonic Distance Measurement Circuit Design+ measurement distance 30-1000cm
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Size: 48128 |
Author: 李诺 |
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Description: 导体通常指电阻率 < 10-4 · cm 的物质。金属和合金一般都是导体，如铝、金、钨、铜、镍铬 等。能带能隙很小或为 0 , 在室温下电子很容易获得能量而跃迁至导带而导电。-Usually refers to a conductor resistivity < 10-4 cm material. Metals and alloys are generally conductors such as aluminum, gold, tungsten, copper, nickel, chromium and so on. Small band gap or to 0, at room temperature, the easy availability of electronic energy and the transition to the conduction band and electrical conductivity.
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Size: 6092800 |
Author: wj |
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Description: poster pwer point template, size 100 by 100 cm
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Size: 1118208 |
Author: sakineh |
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Description: 用smarty模板实现的cms文章管理系统-Achieved using smarty templates article management system cms
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Size: 518144 |
Author: zp |
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Description: MD5加密，已经封装成一个C++类，只要调用该类就可方便使用-This C++ class serves as a wrapper for the Message Digest 5 code described in the Internet RFC 1321.
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Author: Waxgin |
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Description: 本程序由汇编语言设计：
功能分四大块：
1：Read Cmos message
读取一些Cmos 中的信息，并显示。
2: Show The Time
显示当前日期和时间。
3：Test the Key_Board
测试按键，每按一键，相应显示该键的Asci 码 和 Scan 码。
4：Math operation
由用户输入算术式，以 = 结束，相应在屏幕上显示结果。运算符号
包括 + , - , * , / 。
5：Escape
退出程序。
-This program designed by the assembly language: functional divided into four blocks: 1: Read Cmos message to read some of Cmos the information, and displayed. 2: Show The Time displays the current date and time. 3: Test the Key_Board test button, every click of a button, the corresponding display the key code and Scan code Asci. 4: Math operation by the user input arithmetic type, with ' =' end, the corresponding result will be displayed on the screen. Operator symbols, including' +' ,' -' ,' *' ,' /' 。 5: Escape exit the program.
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Author: liuliu |
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Description: Tun2企业网站管理系统是一套针对企业开发的CMS。它是一款具有专业级的功能和傻瓜式管理的网站站管理软件。Tun2追求的是简单与实用。它不同于一般的CMS，繁杂并令人无从下手。Tun2企业网站管理系统比其他CMS对企业更加专一，只有专一的CMS才能更贴近企业的需求。
-Tun2 enterprise website management system is a set of business development for the CMS. It is a professional-class features and management of the site fool station management software. Tun2 pursuit of a simple and practical. It is different from the general CMS, complicated, and is no start. Tun2 enterprise website management system more than any other CMS on specific business, CMS can be single-minded closer to the needs of enterprises.
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Description: 昌贸二代身份证识别 读出二代身份证上的所有信息的实例-CM 2nd identification card reader
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Size: 38912 |
Author: jason.zhu |
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Description: 802.15.3c信道模型讲解及matlab 仿真代码分析-802.15.3c channal mode anlysis and matlab code anlysis
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Author: shiwei |
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Description: A Mobile Ad-hoc Satellite and Wireless Mesh
Networking Approach for Public Safety
Communications
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Author: wangyulin |
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Description: CM的较新版本 适合欧美镑美多个直盘货币对 相对较稳定-Newer versions of CM Europe fit multiple straight plate Pound U.S. currency relatively stable
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Size: 360448 |
Author: 井泉 |
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Description: 一款打印预览控件，全源码，可以参考下，精确到CM,并在程序中统一单位-A print preview control, full source code, can refer to the next, accurate to CM, and in the process of unity
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Size: 175104 |
Author: luoluo |
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Description: 2014年全国数学建模折叠圆桌模型程序源码
一种桌面呈圆形，桌腿随着铰链的活动可以平摊成一张平板的可折叠桌子桌腿由两组各用一根钢筋连接的木条组成，钢筋两端分别固定在桌腿各组最外侧的两根木条上，并且沿木条有空槽以保证滑动的自由度。
问题一：给定长方形平板尺寸为120 cm × 50 cm × 3 cm，每根木条宽2.5 cm，连接桌腿木条的钢筋固定在桌腿最外侧木条的中心位置，折叠后桌子的高度为53 cm。试建立模型描述此折叠桌的动态变化过程，在此基础上给出此折叠桌的设计加工参数-2014 National Mathematical Modeling Folding Round Table Model Open SourceOne kind of circular table, table legs with hinges activities can be amortized into a flat folding table and legs by the two groups with a reinforced connecting strips of wood, steel ends are fixed to the legs of each group the outermost two strips of wood, strips of wood along the grooves and free to slide in order to ensure freedom.One problem: given a rectangular plate size 120 cm × 50 cm × 3 cm, each wood wide 2.5 cm, reinforced wooden legs connected fixed to the center position of the outermost legs of wood, the table is folded height 53 cm. Try to establish this model to describe the dynamic process of folding tables, folding tables are given on the basis of this design and processing parameters
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Author: 预言家 |
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