基于单片机的数字式电压表附程序.doc

摘 要 传统的模拟式（即指针式）电压表已有100多年的历史，虽然不断的改进与完善，仍无法满足现代电子测量的需求。数字式电压表作为数字化仪表的基础和核心，已成为在电子和电工测量、工业自动化仪表、自动测试系统等领域中应用最广泛的一种仪表，并显示出其强大的生命力。 本设计在利用AT89C51单片机的基础上，结合TLC2543转换芯片及LCD显示器构建了测量范围在0~300V的数字式电压表。电压表分为三个档位：6V、30V、300V。该数字式电压表的设计主要由三个模块组成：模拟数据采集处理模块、A/D转换模块及LCD显示模块。模拟数据的采集处理模块由输入电路部分完成。A/D转换模块主要由芯片TLC2543来完成，它负责把采集到的模拟量数据转换成相应的数字量再传送到AT89C51单片机进行数据处理。显示模块是将单片机处理好的数据传送到LCD显示器进行显示。 关键词：数字式电压表，AT89C51单片机，A/D转换，数据处理 ABSTRACT Traditionally, the analog (i.e. pointer type) voltmeter has a history over 100 years. Although it has a continuous improvement and perfection, it still can not meet the demand for modern electronic measurement. As the basis and core of digital instrumentation, digital voltmeter has become an instrument that widely used in the area of electronic and electrical measurement, industrial automation instrument, automatic test system, etc. And show its strong vitality. The design is based on the use of AT89C51 single-chip microcomputer and combines with TLC2543 converter and LCD. All of these constructions formed a digital voltmeter which can measure voltage from 0 to 300V. The voltmeter is divided into three stages: 6V, 30V, 300V. The design of this digital voltmeter mainly consists of three modules: analog data acquisition and processing module, the A/D converter module and the LCD module. Analog data acquisition and processing module is composed of an input circuit part. A/D converter module is mainly composed of TLC2543 chip to complete, and it is responsible for the conversion of analog data into corresponding digital quantity and then it delivers data to the AT89C51 single-chip microcomputer for data processing. The display module transfers data that processed by single-chip microcomputer to a LCD for displaying. Key words: digital voltmeter, AT89C51 single-chip microcomputer, A/D converter, data processing目 录 1 绪论 1 1.1 课题研究的相关背景 1 1.2 设计的基本技术要求 1 1.3 主要设计内容及设计思路 2 1.4 预期成果及其意义 2 2 数字式电压表设计的两种可行性方案研究 3 2.1 由数字电路及芯片构建 3 2.2 由单片机系统及A/D转换芯片构建 3 3 系统设计中