基于89c51单片机的数字电压表设计

在现代检测技术中，常需用高精度数字电压表进行现场检测，将检测到的数据送入微计算机系统，完成计算、存储、控制和显示等功能。本文中数字电压表的控制系统采用AT89C51单片机，A／D转换器采用ADC0809为主要硬件，实现数字电压表的硬件电路与软件设计。该系统的数字电压表电路简单，所用的元件较少，成本低，调节工作可实现自动化。还可以方便地进行8路A／D转换量的测量，远程测量结果传送等功能。数字电压表可以测量0～5V的8路输入电压值，并在四位LED数码管上轮流显示或单路选择显示。

Designing of 89c51 SC Computer-based Digital Voltmeter

In modern measuring technology, it is often required to conduct site measuring with a digital voltmeter. The data measured will then be input into the micro-computer system to execute such functions like calculating, storing, controlling and displaying. The digital voltmeter control system described in this paper makes use of AT89c51 SC computer and ADC0809 A/D converter to fulfill the designing of the software as well as the electrical circuit. The voltmeter features in simple electrical circuit, lower use of elements, low cost and automatic regulation, while it can also easily carry out the duties of measuring A/D converted values from 8 routes and remote transfer of measuring data. The meter is capable of measuring voltage inputs from 8 routes ranging from 0 to 5 volt, and displaying the measurements in turn or only that from a selected route.