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
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
飞机电网故障时，机载电气盒必须在延迟时间内切断电网，保护机载设备。采用AT89S52设计的电气盒测试仪能够测试电气盒保护功能，测量延迟时间。实际应用结果表明，该测试仪具有测量准确、可靠性高、成本低等优点。 Abstract: The helicopter-electrical-box must shut off the helicopter power，protect the equipments of the helicopter when the helicopter power is failed.The tester for the helicopter-electrical-box based on AT89S52is used for testing the protect-ing function and measuring the delay time.Application results show this tester has SOME advantages,such as accurate mea-surement,high dependability,economical cost etc.
上传时间： 2014-12-27
上传用户：786334970
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
从系统硬件设计和软件构成上，介绍一种以AT89C52单片机为核心,通过无线遥控方法实现对预设电话自动拨号报警的智能呼救系统。系统提供了患者在紧急情况下无法使用电话报警时的一种报警手段。由用户预设的多组电话号码作为语音报警对象,预录可长达20 s的语音信号来说明患者所处地点及病情，并通知患者家人。 Abstract: This paper introduces a intelligent alarming system which is realized by wireless remote control system.This system chiefly consists of AT89C51 the system can processor.User can input several groups of telephone number regarded as alarming objects,The system can record SOME information 20 seconds to tell the site of the patient.And notice the rokonok of the patient.
上传时间： 2013-11-19
上传用户：wd450412225
Mega16是一款采用先进RISC精简指令，内置A/D的8位单片机，可支持低电压联机 Flash和EEPROM 写入功能；同时还支持 Basic和C 等高级语言编程。用它设计电子时钟不仅成本低，硬件简单，而且很容易实现系统移植。介绍了如何利用AVR系列单片机Mega16及1602字符液晶来设计电子时钟的方法，同时给出了相应的电路原理及部分语言程序。 Abstract: ?Mega16 is a high-performance, low power consumption, the use of advanced RISC concise instructions, built-in A/D 8-bit microcontrollers, the on-line support for low-voltage Flash, EEPROM write function. Except Mega16 also support the Basic, C, and other high-level language programming.The electronic clock which is deisgned by Mega16 is not only low-cost, simple hardware, but easy to achieve system migration.The design method of electrioic clock based on the AVR Mega16 and character LCD1602 is introduced in this paper,and the corresponding circuit electrionic and SOME language program are given.
上传时间： 2014-12-27
上传用户：zl5712176
在介绍基于MSP430单片机的指纹保险柜工作原理的基础上，从系统软件设计的角度出发，详细介绍了指纹保险柜软件的总体分析过程、程序结构的设计以及代码的编写，给出了按键管理流程和部分源代码。 Abstract: On basis of the operating principle of MSP430 microcontroller-based fingerprint safe,the general analyzing process,program designing and code compiling of the fingerprint safe software are introduced mainly,and the key-press flows chart and SOME codes according to the system software designing are put forward.
上传时间： 2014-12-27
上传用户：gaojiao1999
<Almost since the introduction of microcontrollers as electronic components there always has been an oscillatorcircuit on the device to make it work. From application point of view only SOME external components wererequired to make it work. However, to make sure that it will always work required more effort. This report is basedon feedback from the market from customers applying 8-bit mircrocontrollers.>
标签： oscillators X-tal bit mic
上传时间： 2013-11-12
上传用户：穿着衣服的大卫
Luminary Micro provides an analog-to-digital converter (ADC) module on SOME members of theStellaris microcontroller family. The hardware resolution of the ADC is 10 bits; however, due to noiseand other accuracy-diminishing factors, the true accuracy is less than 10 bits. This application noteprovides a software-based oversampling technique, resulting in an improved Effective Number OfBits (ENOB) in the conversion result. This document describes methods of oversampling an inputsignal, and the impact on precision and overall system performance.
标签： Oversampling Techniques ADC fo
上传时间： 2013-12-17
上传用户：zhyiroy
基于PIC单片机的低功耗读卡器硬件设计:本文提出了一个完整的基于串口的智能读卡器子系统设计方案并将其实现。读卡器的设计突出了小型化的要求，全部器件使用贴片封装。为了减小读卡器的体积，设计中还使用了串口窃电的技术，使用串口信号线直接给读卡器供电。为此，读卡器使用了省电的设计，采用了省电的集成电路，并大胆简化了许多传统的设计电路。关键字： 读卡器， 单片机， 串口窃电 Abstract： This paper aims to put forward a complete design of Smart IC card reader based onSerial Port and propose the way of realizing it for the purpose of Network Security. SMD isadopted to make Smart IC reader smaller in this design. To reduce the volume of Smart ICreader， Serial Port powered technology is employed to get power from the signal line of Serial Port. For this reason， low-power consumption components are adopted in the design and SOME traditional designs are simplified to reduce the power consumption.Keywords： Card Reader； Single-chip Computer； Serial Port Powered IC 卡系统保存了加密算法所需要的工作密钥，供加密算法对网络上传输的数据加密使用，是整个系统网络安全的核心。在IC 卡子系统中，读卡器是一个重要的部分。它起着管理IC卡、在IC 卡和PC或网络计算机间传递数据的重要作用。本文以一片PIC单片机为核心完成了基于RS232 串口的读卡器的硬件设计。
上传时间： 2014-04-14
上传用户：wanghui2438
