具有自动选当功能的数字电压表设计-Read.doc

具有自动选档功能的数字电压表设计 　　　　　　　　　　　　　　 专业：电子信息工程 班级：电信052(本) 姓名：蒋丽霞 指导老师：吴晓飞 　　　　　　　　　　　　　　 摘要 本文设计了基于单片机的数字式电压表，具有可自动选档，测量范围大，精度高等特点。通过对现有的各种方案分析，采用以AT89S52单片机为中央处理器，利用ICL7135芯片为完成A/D转换功能并且由LCD显示结果。给出了具体的硬件设计电路和软件结构，详细叙述了系统硬件线路的设计要点和结构以及软件的设计要点，同时给出了各部分硬件电路原理图和子程序的流程图。经过实验测试，实现了 功能，达到了 等技术指标，基本上达到了任务书的要求。 可测量0~±2000V，精度高可显示4位半位数值 关键词 AT89S52 ICL7135 　LCD显示 数字电压表 自动选档 1.参考文献要按引用次序排列，不可大号在前，小号在后。 2.注意图表（包括流程图）中字体、字号， 3.注意页眉页脚设置  Digital Voltage Meter Design with Function of Automatic selection stalls Profession: Electronic information engineering Class: 052 Name::Jiang lixia Instructor: Wu Xiaofe Abstract This paper was designed digital voltage meter,which based on the single-chip. It has much function such as automatic selection stalls，large measuring range( it can measure 0-±2000V) , high precision (it can show four and a half number). This subject mainly includes the following content: According to the project’s requirements The article describe a solution project in which the single-chip is CPU and the A/D conversion technology combines with the LCD display technology.The specific hardware structure and software design of system is explained.The article introduces the pith of design and structure of hardware and the key points of software structure’s design in detail. Each part of the hardware circuit principle diagram and the flow charts of the software are given. The design of converting the analog input of voltage to digital output uses the high precision A/D conversion chip ICL7135, and its method and Circuit are introduced.The design of the circuit and control method is applicable to the general SCM system, and the hardware and software are practical and universal certainly.（作相应改动） Keyword Microcontroller AT89S52 A/Dconversion ICL7135 LCD-1601（作相应改动） 目 录 引 言 1 第一章 概述 2 第二章 方案论证及整体设计 3 2.1 设计目标 3 2.2 方案论证 3 2.2.1 核心控制系统论证 3 2.2.2 A/D采样电路论证 3 2.2.3 显示电路论