学习单片机离不开实验,以往单片机的实验往往依赖于仿真机和单片机学习系统,价格 昂贵,至使学习单片机的门槛很高,很多人不能跨入单片机学习的大门。近年来,随着FLASH 型单片机的广泛应用,采用软件模拟加写片验证成为一种经济实用的实验方法,尤其是随着 单片机技术的发展,很多单片机都具有了ISP 功能,只要一根下载线即可以编程。STC 单片 机更是将其ISP 功能发挥极致,只要有RS232 接口,不需任何其他电路即可实现ISP 功能。。 多年前,本网站为单片机爱好者设计了实验电路板,并公开了全部的软、硬件资料,广 受爱好者欢迎,很多人使用这块实验电路板学习并由此入门,同时网络上也出现了很多同类 功能的实验电路板,为广大爱好者学习单片机创造了良好的条件。
上传时间: 2014-11-29
上传用户:540750247
介绍电子束焊机电视监视系统工作原理#论述了电视行场扫描原理和视频叠加原理$ 针 对电子束焊机电视监视系统的特点及存在的缺点# 提出一种基PIC16C73单片机及字符叠加芯片 -UPD6453的电子束焊机电视监控系统的设计方案# 并给出了详细的系统软硬件实现方法$ 整个系统 高效可靠#具有电路简单%稳定性好%易于扩展%实用性好等优点#提高了焊接效率和焊接质量$
上传时间: 2013-10-22
上传用户:jasson5678
//CM3 有 最多240个中断(通常外部中断写作IRQs),就是 软件上说的 IRQ CHANAELx(中断通道号x) 每个中断有自己的可编程的中断优先级【 有唯一对应的 中断优先级寄存器 】. 由于CM3支持 硬件中断嵌套,所以可以有 256 级的可编程优先级 和 256级中断嵌套【 书上称:抢占(preempt) 优先级】 所以大家可以设: IRQ CHANAEL 0 通道 = 2 中断优先级WWDG 窗口定时器中断 IRQ CHANAEL 1 通道 = 0 中断优先级PVD 联到EXTI的电源电压检测(PVD)中断 IRQ CHANAEL 3 通道 = 255 中断优先级RTC 实时时钟(RTC)全局中断 IRQ CHANAEL 6 通道 = 10 中断优先级EXTI0 EXTI线0中断 ..... IRQ CHANAEL 239 通道 = (0<x<255) 中断优先级..
上传时间: 2013-10-28
上传用户:redherr
详细介绍工控软件组态王与单片机多机串口通讯的设计原理。分析组态王提供的直接与单片机串口通信方法的优点,给出系统基于RS-485总线传输的接口电路原理图。根据组态王提供的通讯协议和单片机多机串口通讯的原理,给出程序设计流程与思路。 Abstract: In this paper,the design principle of communication between multi-SCM and KingView by serial ports is described in detail.We analysis the advantage of method supplied by KingView,by which KingView can communicate with serial ports of SCM directly,and provide the system’s interface circuit based on the RS-485transmission line.We provide flow diagram of programming and thinking on the basis of communication protocol supplied by KingView and principle of communication among multi-SCM through serial ports.
上传时间: 2013-12-19
上传用户:tecman
介绍了当前普通标记机控制系统现状及其存在缺点,给出气动标记机及相频修正PWM模式的工作原理。采用ATmega16单片机和USB转换RS232接口器件CH341T实现驱动控制系统与PC的实时通讯,标记控制系统可升级到USB接口。采用基于ATmega16的相频修正PWM替换555振荡电路产生的PWM,可直接通过软件调整PWM信号。使用达林顿三极管TIP122替代直流继电器驱动高频电磁阀,使得电磁阀驱动电路简单,成本低廉。该控制系统已成功应用于气动标记机。 Abstract: In this paper,the actuality and demerit of the common gas marking machine control systems are described.The operation principle of the gas marking machine and the phase and frequency correct PWM of ATmega16is introduced.The real-time communication between the driving control system and PC by CH341T which its function is translated USB to RS232is realized,the control systems is updated grade to USB interface.The PWM signal can be adjustable by software for the555surge circuit was substituted by the phase and frequency.The high frequency electromagnetic value’s driving circuit by DC relay is replaced by TIP122,therefore,the circuit is become simple and the cost cheap.The control systems has been widely used in gas marking machine.
上传时间: 2013-10-18
上传用户:1427796291
对于传统的跑步机无法联机组网,保存历史数据,实时调试等问题,介绍了一个由多台跑步机通过RS-232串行总线与上位机相连组成的跑步机联网系统。系统采用W77E58作为下位机核心控制器件,它具有双串行通讯端口,其中一个串口用于与变频器通讯,另一个串口则与上位机相连,构成跑步机网络。 Abstract: The traditional running machine can not be connected to a network, saving historical data, real time debug etc.In this paper,a new network system which is composed of running machines connected by a RS-232 communication bus is introduced.In the system,W77E58 is used as a core control unit.W77E58 has two serial ports,one is connected to the inverter and the other is connected to the PC. Thus a network appears.
上传时间: 2014-12-27
上传用户:哇哇哇哇哇
针对材料试验机等设备中要求测量或控制材料拉伸或压缩的位移,一般采用光电轴角编码器检测位置信号,输出正交编码脉冲信号。若采用其他方法检测位置信号,必然导致电路设计复杂,可靠性降低。因此,提出一种基于LS7266R1的电子式万能材料试验机设计方案。给出了试验机中的控制器工作原理,LS7266R1与单片机的接口硬件设计,以及主程序软件流程图。巧妙地把力量传感器,位移传感器等机械运动状态的压力或拉力以及位置坐标,变成了电压信号和电脉冲数字信号,供A/D测量和LS7266R1计数,从而实现了独立完成材料试验控制或通过PC机串口命令完成材料试验控制。 Abstract: Aiming at the requirement that the displacement of the tension and compression always be tested and controlled in the equipement such as material testing machine. The position signal was tested by photoelectric axial angle coder. Therefore, the paper proposes the design of electronic universal testing machine design based on LS7266R1. If the position signal detected by other methods, will inevitably lead to the circuit design complexity, reliability decreased. The work theory of the controller, the hardware interface design between LS7266R1 and single chip, and the flow chart of main program, are presented in this paper. The signal of the compression or tension power and displacement at working, which tested by power sensor and displacement sensor especially, is changed into electric voltage and electric pulse numerical signals. And these signals can be tested by A/D and counted by LS7266R1. Finally the test of the material properties can be controlled by itself, or controlled by the COM command of PC.
上传时间: 2013-11-02
上传用户:yl1140vista
针对当前安检力学试验机所能完成的试验种类单一、自动化程度低等问题,提出一种以ATmega128单片机为核心控制器的安检力学试验机的设计。详细阐述了该安检力学试验机各个组成部分的设计原理和方案,并且给出了各部分的软件设计思想和操作流程。经过大量测试试验表明:设计的安检力学试验机可以完成多达十余种的力学安检试验,完全符合相关国家标准,并且具有数据采集精度高、传输速度快、操作安全简便等特点,实现了安检设备的多功能化、数字化和自动化。 Abstract: Currently, many mechanical security testing machines have only one function. The degree of automation of them is low. To solve those problems, a new kind of mechanical security testing machine, using ATmega128 micro-controller as its core controller, has been advanced. It describes the components of the machine. The principles and the scheme in the designing processes are presented in detail, and the software architecture and the operation processes of each part are given. After having done many testing, we have reached the following conclusions: the mechanical security testing machine presented can do over ten mechanical security tests complying with related national standards. It has high data acquisition accuracy and high transmission speed. The operation of the machine is simple and safe. In general, this machine is a multi-functional, highly automatic, digitalized security testing device.
上传时间: 2013-11-05
上传用户:a67818601
提出了采用两段式同轴波纹慢波结构实现双频高功率微波输出的相对论返波振荡器, 推导了该结构的TM0n模式色散方程,数值求解了两段式同轴波纹慢波结构TM0n模色散曲线,分析了该器件X波段双频高功率微波输出的产生机理, 分析中考虑了电子注在慢波结构第二段工作效率不变和下降时的双频工作点情况,并运用2.5 维全电磁粒子模拟程序验证了双频微波信号的可靠性。关键词高功率微波;双频;X 波段;相对论返波振荡器 当前, 应用于高功率微波效应的微波器件只有一个主频率,已有的实验结果表明,在现有条件下,单频高功率微波用于攻击敌方的电子系统所需的功率远远大于单只高功率微波源所能产生的功率,即破坏阈值很高[1]。但是,如果用两个或多个频率相近的高功率微波波束产生拍频后用于攻击电子系统,那么所需的功率密度将大大减小,即效应阈值大大下降, 采用这种方式将有可能在现有的技术下使高功率微波实用化[2],但是双频及多频高功率微波源器件的研究目前是十分前沿的课题,处于刚起步阶段,在国内外极少有报道[2~4],因而,用单个微波源器件产生稳定输出的双频甚至多频高功率微波具有重要的实际应用价值和学术价值,是高功率微波领域又一个新兴的研究方向, 在高功率微波武器和新体制雷达等方面将有良好的应用前景。
上传时间: 2013-10-31
上传用户:kxyw404582151
根据大坝变形监测的实际需求,以C8051F410为硬件控制平台,采用先进的CCD技术,设计了用于大坝水平位移监测的具有高精度自动测量功能的引张线仪.重点阐述了检测仪器的工作原理、硬件整体实现方案及软件设计流程.测量结果表明该仪器具有很强的实用性.
上传时间: 2013-11-06
上传用户:wudu0932