基于G4芯片的微型热敏打印机的实现

基于G4的微型热敏打印机的设计与实现方案,全速打印速度约为25行汉字/秒。本系统由G4芯片（基于ARM7TDMI）,LTPZ245B热敏打印头,打印头过热保护电路,打印头加热电路,打印头温测电路,步进电机驱动电路,缺纸检测电路以及控制软件等组成,本文介绍了热敏打印原理并给出本方案的硬件设计电路以及软件设计流程。     

基于G4芯片的微型热敏打印机的实现

基于G4的微型热敏打印机的设计与实现方案,全速打印速度约为25行汉字/秒.本系统由G4芯片(基于ARM7TDMI),LTPZ245B热敏打印头,打印头过热保护电路,打印头加热电路,打印头温测电路,步进电机驱动电路,缺纸检测电路以及控制软件等组成,本文介绍了热敏打印原理并给出本方案的硬件设计电路以及软件设计流程.     

C语言在AVR单片机控制的微打印开发与应用

在计算机高速测控的时代下,运用AVR单片机ATMEGA16做为主控制芯片,在芯片内建立打印字库,使用FAN8200做为热敏打印机走纸系统步进电机的驱动芯片,以日本精工LTP1245高速热敏打印机芯,用计算机控制程序对移位实现数据加载,在测量与控制模式下命令走纸步进电机所需的PWM驱动信号,并通过计算机设计了自定义的字符库,简化了硬件结构,降低了系统成本。通过本课题的研究,探索了单片机技术的最新发展方向以及AVR单片机对微型热敏打印机的控制方法,建立简单、实用、低成本的微型热敏打印系统并取行很好的应用价值。     

微型热敏打印机软件设计

介绍了基于C8051F340的微型热敏打印机工作原理、系统结构,论述了系统控制软件的设计思想,给出了步进电机驱动、打印头点阵驱动控制以及软件优化设计提升系统性能的方法,并给出了具体的程序设计思路和流程图。该款热敏打印机经广泛应用于医疗仪器、工程监测等领域多年,效果良好。     

基于77E58的高速行式热敏打印机控制板的研制

基于77E58研制了一种高速行式热敏打印机控制板,打印速度为20行汉字/秒。充分利用行式热敏打印头的双缓冲结构,实现了打印头加热和数据传送同步进行,简化了电路设计,提高了打印速度;对打印头的保护采用一种独立于单片机的双重保护电路,提高了对打印头保护的可靠性。介绍了行式热敏打印的原理、高速热敏打印机控制板的硬件和软件设计。     

基于DSP的远程网络化电机控制系统

设计了一种基于DSP的远程网络化电机控制系统,对电机控制电路模块中的驱动电路、位置检测及换向控制、保护电路进行了论述并设计了硬件电路;在网络通信模块中基于以太网控制器CS8900A设计了嵌入式远程网络通信部分相应的硬件电路。该设计方案电路简单,可靠性高,具有较好的应用价值。     

高精度二相混合式步进电机控制系统研究

在二相混合式步进电机数学模型的基础上,针对电机低速运行时的振动和噪声过大的问题,研究了正弦脉宽调制细分驱动技术,开发出一种新型的基于单片机的多细分二相混合式步进电机驱动器。该系统主要分为数字控制部分、GAL片逻辑综合信号处理单元、SG3525恒流控制电路、驱动功放电路、过流保护及反馈电路和系统供电电源模块等。系统采用专用集成芯片和可编程逻辑器件,以8位单片机AT89C2051为控制核心,实现恒流控制、正/反转运行、过流保护和多档位细分等功能。实验结果表明,系统硬件和软件设计合理可行,各项技术指标均达到了设计要求。     

基于STC8989C58的热敏打印机驱动系统设计

基于STC89C58单片机设计了一个通用热敏打印机驱动系统。给出了LTPA245热敏打印机的工作时序,设计了驱动系统的硬件电路,详细描述了并行通信和打印控制电路的工作原理,最后给出了系统主程序和外中断程序的流程图。     

软硬件协同设计的步进电机细分技术的研究

本文以满足两相混合式步进电机的运行特性为出发点,设计了驱动控制系统的硬件和软件控制系统。驱动控制系统主要分为控制部分、驱动器部分、系统供电电源模块等。以单片机STC89C51为微处理器控制核心,实现对步进电机的运转方向和速度快慢的执行控制。驱动硬件电路核心部分采用高精度细分驱动芯片THB6128实现对步进电机的精细驱动,测试结果较理想。实际应用的结果表明,该系统稳定可靠,应用简单可行。     

浅谈步进电机控制系统的设计

步进电动机由于用其组成的开环系统既简单、廉价,又非常可行,因此在打印机等办公自动化设备以及各种控制装置等众多领域有着极其广泛的应用.本文应用单片机对步进电机进行控制,从硬件和软件设计论述其实现方式,实现了步进电机的智能化,有一定的实用价值.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.