摘  要：21世纪随着我国现代化技术的飞速崛起，如今电子检测技术也跟着与时俱进起来,当今电子检测技术中，通常都会需要数字电压表来实施数值的勘测。市场上，电压表分为指针式电压表和数字式电压。指针式电压表功能单一，指针处理精度很容易受到外力以及硬件老化等不利因素影响。数字电压表（Digital Voltmeter）原理上是通过A/D转换器将模拟量转换数成数字量并加以显示，数字量被单片机接受处理并显示在数码管上，因此它具有抗干扰力强、精度高和能与电脑通信等特点。本次设计则采用STC89C52单片机为核心，ADC0832转换模拟量为数字量,实现电压测量。

该论文有图12幅，表2个，参考文献7篇。

关键词：数字电压表   STC89C52   ADC0832

Digital Voltmeter based on 51 MCU

Abstract：With the rapid rise of modern technology, electronic detection technology also keeps pace with the times. At present, the market mainly uses pointer type voltmeter and digital voltmeter. The measuring accuracy of the pointer type voltmeter is easily affected by external forces and adverse factors such as aging hardware. Therefore, it can't meet the demand of the digital age. The modern electronic detection technique usually needs to use digital voltmeters to detect voltage. The digital voltmeter uses A/D converter to convert the analog signal to digital signal. The digital signal is processed by MCU single chip microcomputer and displayed in LED Segment Displays. These makes that the digital voltmeter has the characteristics of strong anti-interference, high accuracy and communication with computer, etc. This design adopts STC89C52 single chip microcomputer as the core and ADC0832 conversion to realize voltage measurement.

The paper has 12 pictures, 2 tables and 7 references.

Key Words:  Digital voltmeter  STC89C52   ADC0832

目  录

摘  要 I

ABSTRACT II

目  录 III

图清单 IV

1 绪论 1

1.1 课题背景 1

1.2 发展延伸方向 2

1.3 本设计完成工作 2

1.4 本章小结 2

2 STC89C52单片机制电压表设计方案 3

2.1 硬件设计 3

2.2 硬件实现及单元电路设计 4

2.3 模数转换模块设计 8

2.4 数码管显示电路设计 12

2.5 电源结构 12

3 系统软件设计方案 14

3.1 系统子程序设计 14

3.1.1 初始化程序 14

4 系统的安装与调试 16

4.1 安装调试 16

5 结论 17

致谢 19

图清单

图序号 图名称 页码

图2-1 系统总体框架 3

图2-2 单片主控电路 4

图2-3 时钟电路