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
以89S52单片机和EP1C6Q240C8型FPGA为控制核心的多功能计数器，是由峰值检波、A/D转换、程控放大、比较整形、移相网络部分组成,可实现测量正弦信号的频率、周期和相位差的功能。多功能计数器采用等精度的测量方法，可实现频率为1Hz～10MHz、幅度为0.01～5Vrms的正弦信号的精确测频，以及频率为10Hz～100kHz、幅度为0.5～5Vrms的正弦信号精确测相。液晶显示器能够实时显示当前信号的频率、周期和相位差。该多功能计数器精度高，界面友好，实用性强。 Abstract: A multi-function counter，which uses89S52MCU and EP1C6Q240C8FPGA as a control core，consists of peak detector，A/D conversion，program-controlled amplification，compared shaping and phase-shifting network part.The counter measures the frequency，period and phase of sinusoidal signal.With the equal precision method,the multi-function counter achieves the precise frequency measurement of the sinusoidal signal which its frequency is from1Hz to10MHz，its amplitude is from0.01Vrms to5Vrms，as well as the accurate phase measurement of the sinusoidal signal which its frequency is from10Hz to100kHz，its amplitude is from0.5Vrms to5Vrms.The LCD monitor real-time displays the frequency，period and phase difference of current signal.The multi-function counter features high precision，friendly interface，and strong practical.
上传时间： 2013-11-15
上传用户：gy592333
介绍一种多功能音乐播放器，它是以AT89S52单片机为核心，并辅有一些外围器件，采用汇编语言编写程序，实现多功能音乐播放，歌曲自动循环播放和使用琴键自编曲目功能。此外，彩灯显示歌曲节奏，按键跳转到喜爱曲目，液晶显示当前播英文曲目。并给出了系统软硬件设计。 Abstract: It introduces a multifunctional music player,taking AT89S52 single-chip microcomputer as hardware control core and using some peripheral elements.Programmes are compiled in assembly language to act as expected.There are two functional modes in this system.One is to make the music play automatically and consecutively,the other is to compose new songs through keys.In addition,lights show the pace of music and the English names can be displayed in the liquid crystal screen.With perfect combination of hardware and software,the music player can meet many music lovers’needs for multifunctional music player.And the hardware and software of the system are given.
上传时间： 2013-11-18
上传用户：xiaodu1124
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
介绍了基于单片机航空交流电参数测试仪的系统设计。以Silicon Labs公司的C8051F005单片机为核心设计出数据采集板，通过RS-232串口与上位机通讯。运用Lab Windows/CVI编写的上位机软件实现信号的检测以及波形和数据的显示，给出了测试仪硬件电路的组成和软件流程图。本系统具有硬件结构简单、容易实现和成本低等特点，在实际应用中其稳定性、精确性均能满足客户要求。 Abstract: The design of aeronautics AC parameters tester based on the single-chip is introduced.The core component of data acquisition board is C8051F005 single chip of Silicon Labs Company,and communication with PC through RS-232. The signal processing software programmed with LabWindows/CVI can be used successfully to fulfill inspection of signal and display of the waveform and data. The hardware and software configuration of test instrument are provided.The hardware of the system is simple, and can be easily realized.The stability and precision of the measurement instrument are enough to meet the requirements.
上传时间： 2013-11-18
上传用户：wang5829
为降低成本和解决现有膜片钳放大器系统中PC机的干扰问题，研究了一种基于单片机的膜片钳放大器小系统。该系统采用ADI公司生产的ADuC841作为控制核心，并且配置相应的液晶显示模块LCM3202401。模拟电路部分采用高输入阻抗的AD8627实现微电流信号的采集，并由后级电路进行信号的放大和电阻电容的补偿。它具有硬件电路简单、体积小、使用方便的特点。既可以单独作为小系统实现采集和显示，也可以通过红外方式和PC机进行通讯，在PC机上进行信号的处理。 Abstract: In order to reduce cost and resolve the interferential problem with PC in existing patch clamp amplifiers, a small patch clamp amplifier system design based on microcontroller is studied. It adopts a new high performance microconverter ADuC841 by the ADI as the control core in the system, configuring a liquid crystal module LCM3202401. In the analog circuit, AD8627 with high input impedance is used to detect the low current，signal magnification, as well as resistance and capacitance compensation are accomplished by subsequent circuits. It has the advantage of simple hardware circuit design, small volume and convenient operation. It can either be used as an independent system to measure and show signal detected or transmit to PC by infrared ray.
上传时间： 2013-11-06
上传用户：yy_cn
为解决输油管道温度压力参数实时监测的问题，设计了以C8051F930单片机作为控制核心的超低功耗输油管道温度压力远程监测系统。现场仪表使用高精度电桥采集数据，通过433 MHz短距离无线通信网络与远程终端RTU进行通信，RTU通过GPRS网络与PC上位机进行远程数据传输，在上位机中实现数据存储和图形化界面显示，从而实现输油管道温度压力参数的实时监测和异常报警。经实验证明，该系统的12位数据采集精度满足设计要求，漏码率小于1%，正常工作时间超过5个月，能实时有效地监测输油管道的温度压力参数，节省大量人工成本，有效预防管道参数异常造成的经济损失和环境污染。 Abstract: In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters， the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field instruments for data collection， the 433MHz short-range wireless communication network was used to make communication between field instrument and RTU， the GPRS was used by the RTU to transmit data to the PC host computer， and the data was stored and displayed in the PC host computer， so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time， it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.
上传时间： 2013-11-07
上传用户：cuibaigao
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
摘要：设计了后面两轮驱动，前轮采用万向轮的三轮AGV。在简要介绍其结构和考虑非完整约束基础上．使用矩阵方法分析了AGV转弯问题，得出柔顺运动模式下的状态空间和控制方程。同时，搭建了PC机为上位机，MC~51单片机为下位机的CA总线无线通讯系统。优化参数下的路径跟踪仿真和实验证明了滑模变结构控制器和无线通讯系统的有效性。关键词：非完整约束；自动导航车；CAN现场总线；滑模变结构控制
上传时间： 2013-11-02
上传用户：youmo81
AVR mega128开发板 联系 杨迪 15336417867 0531-55508458 QQ：1347978253 http://www.easyele.cn 产品概述:AVR mega128开发板是AVRVi开发的基于Atmega128单片机的综合学习开发系统，板载学习资源，集成JTAG仿真器和ISP下载功能，核心板可拆卸独立使用，是你学习AVR单片机，参加各类电子设计竞赛，快速搭建产品的不二选择。AVR mega128开发板亦可以作为单片机培训，高校实验室，课程设计等的实验器材。为了更好的支持客户的学习和开发，此开发板板通讯接口升级为USB接口，方便计算机没有串口的朋友，学习起来更加简捷。货号：EasyAVRM128SK-A 规格： 套 重量：300克 单价498/套。 参数特色： 1.采用核心板和主板分离的形式，在系统的学习之后，可以把核心板直接用于产品中，快速搭建系统。 2.开发板上集成了AVR JTAG ICE仿真器和AVR ISP编程器，超高性价比。 3.您只需要再拥有一台计算机，而不需要购买仿真器和编程器就可以学习开发了。 4.信号调理电路，输入0～10V，轨至轨信号调理。 5.系统资源适中，性价比高。 6.丰富的学习资源，完善的产品支持。 7.EasyAVR教给你从开发环境建立，软件编译，到下载，传真，硬件设计等一系列电子工程师必备的技能，真正学以致用。 AVR mega128开发板板上资源： M128 所有引脚引出，可以利用杜邦头很方便的进行接插扩展，标准2.54针距，可以直接插在万用板上使用，便于进行实验 m128 DB Core 自带5V、3V3 双路电源稳压 m128 DB Core 外部晶振多种选择，既可以使用板上已经焊接好的14.7456M的晶振，也可以自己根据自己的需求扩展，晶振的切换通过跳线实现m128 DB Core 带有JTAG ISP 标准接口 m128 DB Core 自带一路标准RS232－TTL转换电路，方便实现串口通信 AVR mega128 开发板底板：板载JTAG 仿真器 板载STK500 下载内核 2路独立可调的信号调理电路，可控增益G=0.1-10 2路RS232 串行接口 1路RS485 接口 8 路LED 显示 4 位动态7 段数码管，利用74HC595进行驱动 4 位独立按键 板载IIC 总线PCF8563 实时钟芯片 板载IIC 总线EEPROM AT24c01 1 路有源蜂鸣器 1 路18B20 温度传感器接口，支持单总线器件。(12820可选：10元每个) 1602LCD 接口(送1602液晶) 12232、12864 LCD 接口(LCD12864可选：80元每个) 想找一份好工作吗？ 你想成为一名电子设计工程师吗？ 你对电子设计有浓厚兴趣，而没有工具吗？ 看了很久的程序方面的书籍，却没有实践的机会吗？ 需要开发产品，想快速入门？ 想参加电子设计大赛，机器人大赛吗？ 这个性价比高的专业工具是你的不二选择，它不仅仅是一个AVR mega128 开发板，他还是一个强大的开发工具，通过它进行学习后，对电子产品的设计有进一步的认知，建立起学习ARM，DSP，FPGA的良好基础。AVR mega128 开发板集成了AVR学习板，AVR开发板，AVR编程器，AVR仿真器，AVR核心板的功能，并且可以分开独立使用。 销售清单： 1、调试好的AVR mega128开发板一块(板载JTAG ISP 二合一，已经写入自检程序) 2、ATmega128核心板一块 3、USB供电线一条 4、标准串口(RS232)通讯线缆一条 5、资料光盘一张 6、使用说明书（实验讲义）一本 7、保修卡即订单清单一份 8、赠送LCD1602液晶一块
上传时间： 2013-11-10
上传用户：zm7516678
