本课题是利用单片机设计一个数字电压表，能够测量0－5V之间的直流电压值，四位数码管显示，使用的元器件数目较少。外界电压模拟量输入到A/D转换部分的输入端，通过ADC0832转换变为数字信号，输送给单片机。然后由单片机给数码管数字信号，控制其发光，从而显示数字。此外，本文还讨论了设计过程中的所用的软件硬件环境，调试所出现的问题等。-The issue is the use of a single-chip digital voltmeter designed to measure the 0-5V DC voltage between the value of four digital display, the use of fewer components. External analog voltage input to the A/D converter part of the input into a digital signal converted by the ADC0832, transportation to the microcontroller. Then by the microcontroller to the digital control digital signal, to control its light, which shows the number. In addition, this article discusses the design process used in software and hardware environment, such as debugging problems.