基于单片机的直流数字电压表设计毕业论文(设计).doc

河北大学工商学院2012届本科生毕业论文（设计） 装订 装 订 线 本科生毕业论文（设计） 题目： 基于单片机的直流数字电压表 基于单片机的直流数字电压表 摘　　要 本文介绍一种基于AT89C51单片机为主要控制器件，采用ADC0809高精度、逐次逼近式A/D转换器的8路直流式数字电压表。主要包括硬件电路设计和软件设计两部分。硬件电路主要由四个模块组成：通路选择模块、A/D转换模块、数据处理模块以及显示模块。通路选择模块主要由按键选择电路组成，负责8路模拟通道的选择。A/D转换模块采用ADC0809完成，负责把采集到的模拟量转换为相应的数字量再传送到数据处理模块。数据处理模块则由AT89C51完成，其对ADC0809传送来的数字量进行一定的数据处理，产生相应的显示码送到显示模块进行显示，并负责控制ADC0809和读取按键的工作。输出显示模块采用4位一体的7段LED数码管，负责将所选通道数以及该通道电压值显示在数码管上。软件设计部分主要包括主程序以及初始化程序，按键读取程序，中断程序，显示程序等几个子程序模块。通过按键的选择，该数字电压表可以测量8路模拟电压值，在多点巡回检测和过程控制、运动控制中应用十分广泛。 关键词：单片机；数字电压表；A/D转换；ADC0809 Design of DC Digital Voltmeter Based on Single-chip Microcontroller Abstract This paper introduces a kind of new method about DC digital voltmeter which takes the Micro Controller Unit AT89C51 as the primary control component and uses the high-precision, successive approximation A/D converter ADC0809. It mainly included hardware circuit design and software design. The hardware circuit is mainly composed by four modules: path selection module, A/D conversion module, data processing module and display module. Channel selection module composed of a key selection circuit, which is used for the selection of 8 analog channels. A/D conversion module uses ADC0809 to finish. It puts the analog conversion for the digital quantity, and then the result is transmitted to the data processing module. The data processing module is completed by the AT89C51. On one hand, the ADC0809 sends the digital quantity to certain data processing to produce a corresponding display codes which are sent to the display module for the show of voltage. On the other hand the AT89C51 is responsible for the control of ADC0809 and reading the key. Output display module is composed of a LED digital tube, which is used for displaying the selected channel and the voltage value of this channel. While the software system consists of main procedure, initialization procedure, key reading program, interrupt program, display program and subroutine module. This digital v