[工学]数字电压表.doc

摘 要 一些传统测量仪器使用复杂，容易造成读数误差。人们想用更加直接的方式读取想要的数据,减小读数误差。为了解决这个问题，各种数字显示仪器应运而生。尤其是近年来，随着大规模集成技术的发展，测量仪器精度越来越高，并且使用更加方便。 本文提出基于AT89C51的数字电压表，将模拟电压量直接转换成数字量并用数码管显示。首先介绍所用单片机的基本功能，以及所用集成电路的各管脚功能。其次对设计方案做整体介绍，模拟电压量经过模数转换芯片ADC0809转换成数字量，送入单片机进行处理。最后输出的数据在经过CD4511译码直接驱动数码管显示电压大小。最后介绍程序设计方案，用汇编语言编写最终代码，并用KEIL和PROTUES联机调试进行仿真。调试完成之后进行硬件焊接，实地测试并行改进。 关键词：集成电路 单片机 模数转换 汇编语言 KEIL PROTUES ABSTRACT The method of using some traditional survey tools is very complex and some errors result from our eyes. So some people want to get the result in a more direct way. The error made by our eyes can be avoided. To solve this problem, some survey tools displaying its result in number have been produced. In resent years,with the development of the large integrated circuit,the survey tool is more convenient to use with high accuracy. This thesis comes up with the digital voltmeter based on the chip microcomputer AT89C51. The digital quantity displayed by Nixie tube are converted from analog quantity directly. Firstly , this thesis introduce the based function of the microcomputer and the integrated circuit. The meaning of their pins will be explained in detail. Secondly , a overall summary will be made to introduce my design scheme. The analog quantity can be converted into the digital quantity by the analog to digital converter ADC0809. Then data processed by the chip microcomputer will be transmitted into the encoder CD4511. The result will be displayed on the digital tube drived by the encoder. Finally, this thesis introduces the program code wrote in the assembly language. The circuit will be simulated by the KEIL and PROTUES. Hardware circuit are made after the simulation. The worker should be tested in practise and improved. Keyword: integrated circuit chip microcomputer analog to digital assembly language KEIL PROTUES 目 录 第一章 绪论 1 1.1 数字电压表简介 1 1.2 数字电压表的优点 1 1.3 数字电压表发展趋势 2 1.4 设计电压表基本工作原理 2 第二章 总体方案设计 3 2.1 设计要求 3 2.2 设计思路 3 2.3设计方案 3 第三章 硬件电路设计 5 3.1