51单片机简易数字电压表的设计

基于51单片机的数字电压表设计

二级学院铜陵学院

专业自动化

班级

组号

组员

指导教师

设计周期：20012年6月5日～2008 年6 月28日

目录

一课程设计任务书·····························································································································错误！未定义书签。

1.1 设计题目、目的····················································································································错误！未定义书签。

1.2 题目的基本要求和拓展功能··························································································错误！未定义书签。

1.3 设计时间及进度安排··········································································································错误！未定义书签。

二设计内容············································································································································错误！未定义书签。

2.1 元器件选型······························································································································错误！未定义书签。

2.2 系统方案确定·························································································································错误！未定义书签。

2.3 51单片机相关知识··············································································································错误！未定义书签。

2.4 AD转换器相关知识··············································································································错误！未定义书签。

三数字电压表系统设计 (7)

3.1系统设计框图 (8)

3.2 单片机电路 (9)

3.3 ADC采样电路 (10)

3.4显示电路 (11)

3.5供电电路和参考电压·························································································································································· 3.6 数字电压表系统电路原理图·········································································································································四软件部分

4.1 主程序

4.2 显示子程序

五数字电压表电路仿真

5.1 仿真总图

5.2 仿真结果显示

六系统性能分析

七心得体会

简易的数字电压表的设计

一课程设计任务书

智能仪表课程设计是自动化专业的专业实践课程。本课程的任务是通过设计完成功能的单片机系统，使学生掌握目前典型的自动化易表的一般设计要求和设计方法，掌握开发及设计工具的使用方法，通过这一实践过程，锻炼学生的动手能力和分析、解决问题的能力，培养对所学知识的综合应用能力。

1、设计的题目

简易数字电压表的设计

对简易数字电压表的设计，掌握目前自动仪表的一般设计要求，工程设计方法，开发及设计工具的使用方法。数字电压表简称DVM，数字电压表基本原理是将输入的模拟电压信号转化为数字信号，再进行输出显示。而A/D转换器的作用是将连续变化的模拟信号量转化为离散的数字信号，器基本结构是由采样保持，量化，编码等几部分组成。因此AD转换是此次设计的核心元件。输入的模拟量经过AD转换器转换，再由驱动器驱动显示器输出，便得到测量的数字电压。

2、基本功能要求：

1.可以选择测量测量8路0-5V的8路输入电压值；

2.可轮流显示或单路选择显示（可选）；

3.测量显示最小分辨率为0.01V;测量误差约为0.02V；

4. 具有电压过低、过高声光报警功能，报警限可独立设置；

拓展功能：

（1）：测量电压范围扩大，可测量小电压和大电压；可测量显示0-2mA电流；

（2）：带通讯功能，电压测量值可在PC机上显示；

（3）：带实时存储记忆和复现功能；

3、设计时间及进度安排：

1、学分：3分

2、时间安排：3周

计划安排：

第17周任务布置，确定分组。任务分析，方案，绘制原理图：

第18周进行设计方案的确认，提交原理图，元器件清单何预定价格，进行购买；第18周硬件焊接，调试；软件编程，联合硬件的调试；

第19周撰写课程实际报告，分组验收答辩；

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