毕 业 论 文基于单片机的数字电压表的设计摘 要本设计主要讨论的是以 AT89C51 单片机为核心的电压测量系统，该系统能够在单片机的控制下完成对电压信号采集，能够根据采样值进行量程自动转换，并且测量结果可通过四个数码管显示出来。整个系统的设计完成了硬件电路的设计及软件程序的编写，通过最终硬件电路的调试及软件程序的仿真，使该系统能够在要求的条件下达到正常的测量及显示功能。在整个系统的设计过程中，主要采纳了模块化的设计方法。关键词： AT89C51 单片机；数字电压表；模块化Design of the digital voltmeter based on the MCUAbstract This paper introduces an achievement of a voltage measure system based on the AT89C51 MCU. This system can accomplish the signal sampling of voltage, and change range automatically according to the signal sampled. The result can be displayed through numeral rube of four places.In this design, the hardware circuit and software programming are both realized at the judge of hardware circuit and imitation of software program. This system can fulfill the function of measure and displaying under the demanded conditions. Over the designing of the whole system, the method of modularity is used.Key words: AT89C51 MCU; Digital Voltmeter; Modularity 目 录绪论..............................................................................................................................................1第一篇 硬件部分的设计............................................................................................11. 数据采集部分的设计.......................................................................................................21.1 沟通信号和直流信号的采样.............................................................................................22. 量程自动转换电路的设计..............................................................................................43. 模数转换单元的设计................................................................
