智能数字电压表的设计

论文总字数：14333字

摘 要

随着现代电子技术和计算机技术的快速发展及其在测量仪器在的应用，测量仪器的精度不断提高，智能化、自动化水平也得到实现。针对模拟式电压表的不足，以型单片机为核心控制器，设计了一款智能数字电压表，系统主要包括输入电压分压电路、前置放大电路、转换电路、过压保护电路、单片机最小系统和以及显示电路等部件。详细分析了每个功能模块工作原理与设计方法，并对硬件电路及软件模块进行的设计与安装调试，结果表明设计的基于单片机的智能电压表能够实现对交直流电压的测量，通过强大的数据处理能力及自校零技术，有效提高了测量精度及抗干扰能力。

关键词：数字电压表，AT89C51， A/D转换

Abstract：With the rapid development of electronic technology and computer technology, especially the single chip microcomputer which on the one hand, the development, is our past traditional measuring instrument function on the principle of precision and automation level, considerable changes have taken place in the formation of a new type of measuring instrument, intelligent measuring instrument is by far the most traditional instruments have relatively intelligent instrument also appeared many new types of instruments and test system.

Is introduced in this paper, based on the design goal, intelligent digital voltmeter with micro controller selected as the core controller, the system mainly includes the conversion circuit, over voltage protection circuit, single chip microcomputer minimum system and partial pressure input and display circuit components, including specific composition module of the system design of intelligent digital voltmeter.

In this paper, using the knowledge of single chip microcomputer is to write the control program, using the knowledge of the electronic circuit to design the connection between the various plates, intelligent digital voltmeter with high precision and strong anti-interference ability, but also has powerful data processing capabilities.

Keywords: digital voltmeter AT89C51 A/D conversion

目录

1.引言....................................................5

1.1数字电压表的概述.......................................5

1.2研究的背景.............................................5

1.3研究的意义和目的.......................................5

2.基于单片机的数字电压表的硬件设计........................6

2.1系统总体的设计方案.....................................6

2.2总体电路的设计.........................................7

2.3量程自动转换电路.......................................7

2.4自动调零电路...........................................8

2.5A/D转换电路............................................8

2.6显示电路..............................................12

1. 系统软件设计...........................................13

3.1软件系统的总体设计....................................12

3.2数据采集模块的设计....................................13

3.3数据处理模块的设计....................................14

3.4程序流程图............................................17

4系统安装与调式..........................................18

4.1电路调试..............................................18

4.1.1调试步骤............................................18

4.1.2可能出现的问题解答..................................18

4.3系统调试与结果分析....................................19

4.4实物图................................................19

5结论....................................................20

6致谢....................................................21

7参考文献................................................22

目录

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