设计一种基于P89V51RD2的功率因数测量仪，采用光电隔离器和专用数码管驱动器。该测量仪是以增强型单片机P89V51RD2为核心，大大简化系统硬件设计。而软件部分采用模块化设计思想，采用中值滤波和小数补偿算法，实现功率因数的高精度测量。实验测试表明，该功率因数测量仪测量精度高，运行稳定可靠。 Abstract: A power－factor measurement instrument based on P89V51RD2is designed，which uses optical coupler and specific LED drive chip.The power factor measurement instrument uses P89V51RD2as a core of which greatly simplifies the system design.Furthermore，modularization software is developed in detail.The high precision power－factor measuring system is realized by the center value filter and fractional compensation algorithm.Experiments manifests that the power－ factor measurement instrument is high precision，steady and reliable.
上传时间： 2014-12-27
上传用户：CHINA526
首先研究CAN总线和SAE J1939协议，提出一种基于MC9S12HZ256微控制器的总线式汽车数字仪表解决方案。详细介绍SAE J1939协议的报文帧格式及应用层协议中发动机相关参数的定义，以及步进电机及其驱动和车速信号的处理方法。该数字仪表系统硬件平台由微处理器和信号采集和信息处理及显示等模块组成。软件设计部分编程实现了对CAN总线和各传感器数据的读取、处理。该系统能够实时反映车辆工况。 Abstract: In this paper，CAN bus and SAE J1939protocol are researched，and a vehicle digital instrument solution based on MC9S12HZ256MCU is proposed.The message frame format and some engine-related parameters’definition in SAE J1939application layer protocol are introduced in detail.Stepper motor and its driver，the methods of speed signal process-ing are also introduced.The hardware platform of vehicle digital instrument is composed by MCU，signal acquisition mod-ule，and signal processing and displaying module.Data receiving and processing from CAN bus and sensors are accom-plished by programming，and vehicle condition can be reflected in real-time.
上传时间： 2013-10-20
上传用户：huannan88
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
针对目前汽车追尾事件频发问题，提出一种防汽车车前和车后追尾的安全装置设计。该设计以高性能、低功耗的8位AVR微处理器ATmega8L为核心，结合霍尔式车速传感器、激光雷达测距装置和MMA7260QT加速度传感器，能够兼顾车前和车后，摒弃以往设计中只考虑车前或车后单一性缺点，尤其适用于高速、夜晚或新手行车。 Abstract: Aiming at the high frequency of vehicle rear-end collision，a safe device design of anti-vehicle rear-end collision is presented.In the design，the high-performance，low-power8-bit AVR microprocessor ATmega8L is utilized as a core combined with Hall-type speed sensor，laser-radar ranging devices and the acceleration sensor MMA7260QT.The design considers both the front and back of a car，and overcomes the drawbacks of former designs in which only the front or the back of the car is considered，so it is especially suitable for high-speed，night or the beginner’s driving.
上传时间： 2013-10-14
上传用户：GavinNeko
实时时钟是微机保护装置的重要部件，在讨论PCF8583结构与功能的基础上，提出采用dsPIC33F系列微处理器与串行I2C时钟PCF8583的接口设计方案，给出了相应的接口电路与软件流程。该设计方案结构简单，可靠性高，开发周期短，具有一定的实用与参考价值。所设计的微机保护装置已投入现场运行，效果良好。 Abstract: Real-time clock chip is an important part in microcomputer protection device.Based on discussing the structure and function of PCF8583，a new interface scheme which uses dsPIC33F microprocessor and serial clock chip（I2C）PCF8583is proposed.The method of the circuit design and the main software flow are introduced in this paper.The scheme has simple structure，higher reliability and shorter exploitation cycle，so has definite practicality or reference value.The microcomputer protection device has been put into operation with better effects.
上传时间： 2013-11-18
上传用户：Thuan
介绍一种基于C8051单片机的动态心电监护系统。该系统由两部分组成：以C8051F320单片机为核心的数据采集装置和以PC机为平台的分析处理系统。硬件电路功耗低，由单片机自带的USB接口将数据传送给PC机。软件平台采用LabVIEW可视化虚拟仪器系统开发平台，将传统仪器的功能模块集成到计算机中，用户可通过修改虚拟仪器的程序改变其功能。采用USB接口实时传输心电数据，并将数据采集模块设计为计算机外设，使该系统高速快捷、小巧便携。 Abstract: In this design，a low-cost ECG electrocardiogram monitoring system is introduced，which consists of two parts:data acquisition device based on C8051F320and PC terminal as the analysis and processing system.The system is low-power consumption，the data is transmitted to the PC terminal by USB interface of the C8051F320.By using the visible virtual instrument system developing platform LabVIEW，the traditional instruments function modules are integrated into the computer，so the user can modify virtual instrument software to change its function to meet their needs.Using USB in-terface to realize real-time ECG data transmission，in addition，ECG data acquisition module is designed as the computer peripheral，which makes the syetem high-speed and portable.
上传时间： 2013-11-13
上传用户：zhangzhenyu
介绍一种以Atmel公司的Attiny13为处理器的投影仪防盗器设计方案。该防盗器具有功耗低，功能完整，防盗效果良好等特点，除具有报警功能外，防盗器还具有以无线方式向主机发送报警信号的功能。采用315MHz发射模块实现无线信号发送。该投影仪防盗器可适应众多厂家生产的防盗器主机。 Abstract: This paper introduces the design scheme of overhead projector's anti-theft device which users ATMEL company’s Attiny13as processor.This anti-theft device features low powerloss，functional integrity，good effect of anti-theft.In addition to its own with alarm functions，the anti-theft device also has alarm function which can send alarm signal to the host through wireless way.It sends wireless signal using315MHz transmitting module，so this overhead projector’s anti-theft device is adapted to anti-theft device host produced by many manufacturers.
上传时间： 2013-11-02
上传用户：ysystc699
设计一种基于AT89C52的语音录放系统，利用单片机、ISD2560语音录放器件、麦克风、扬声器等元器件实现硬件电路的设计，并利用C51高级语言设计ISD2560器件控制字的写入和定时中断程序。经软硬件调试，结果表明该系统录放效果良好，具有一定的工程实用价值。 Abstract: Voice recording and playback system based on AT89C52is designed in this paper.Using the single-chip microcomputer，voice recording and playback chip ISD2560，microphone and speaker to realize the hardware circuit design.Writing ISD2560control words and timing interrupt procedures are designed by C51advanced language.Through the hardware and software test,voice recording and playback system play better voice,and this system has some engineering practical values.
上传时间： 2013-10-20
上传用户：ywcftc277
MG3500SoC是支持H.264高清编解码器的片上系统，内部集成一个嵌入式ARM926处理器，支持高清H.264编解码、MPEG鄄2解码和JPEG编解码。介绍了MG3500SoC的主要性能特点、引脚排列、主要接口功能及在DVR上的应用，以及MG3500SoC及其周围器件的硬件设计，提出了在设计中应注意的问题。 Abstract: The MG3500System-on-Chip（SoC）is high definition（HD）H.264codec,including ARM926-EJ processor，H.264encoder/decoder，MPEG2decoder and JPEG/MJPEG encoder/decoder.The features,pin assignments，interfaces and the typical application of MG3500in DVR are introduced in this paper.The application hardware circuit between the MG3500SoC and peripheral device are given,the questions which the syetem design needs to pay attention are explained.
上传时间： 2013-11-12
上传用户：elinuxzj
针对盘山路存在的转弯盲区，即在转弯时司机无法得知弯路对面是否有车辆通过，设计一种基于C8051F310的山路转弯预防警示系统。该系统利用一阶滤波算法检测山路转弯时是否有车辆通过。运用该算法可增强系统检测的实时性，提高检测机动车辆的灵敏度，同时大大减少环境温度对检测的干扰。试验表明该系统能够正确指示出在山路转弯时是否有车辆通过，目前该系统已安装在盘山路上，可大大减少事故的发生率。 Abstract: Aiming at passing hilly road，there is a turn blind spot.Motormen usually do not know if the passing of vehicles pass the road.So a system of defending accident on hilly road is designed,which is based on MCU C8051F310.The sys-tem uses the first-order filter algorithm to detect whether there are passing vehicles.This algorithm enhances the real-time detection and improves the sensitivity of detection vehicles.Meanwhile,it reduces the detection interference of environmen-tal temperature.The experimental results show that this system can exactly indicate if there are passing vehicles.At present,the system has been successfully applied to hilly road.The system can greatly decrease accident.
上传时间： 2013-10-10
上传用户：归海惜雪
