基于单片机的数字电压表

论文编号:JD063    字数:9474,页数:29

摘要：本文介绍一种基于89S52单片机的一种电压测量电路,该电路采用ICL7135高精度、双积分A/D转换电路，测量范围直流0-±2000伏，使用LCD液晶模块显示，可以与PC机进行串行通信。正文着重给出了软硬件系统的各部分电路，介绍了双积分电路的原理，89S52的特点，ICL7135的功能和应用，LCD1601的功能和应用。该电路设计新颖、功能强大、可扩展性强。

关键词：电压测量，ICL7135，双积分A/D转换器，1601液晶模块

Abstract : The introduction of a cost-based 89S52 MCU a voltage measurement circuits, the circuits used ICL7135 high-precision, dual-scoring A/D conversion circuits, measuring scope DC 0-2000 volts, the use of LCD that can be carried out with a PC serial communications. The paper focuses on providing a software and hardware system components circuit, introduced double integral circuit theory, 89S52 features ICL7135 functions and applications, LCD1601 functions and applications.

the circuit design innovative, powerful, can be expansionary strong.

Key Words : Digital Voltmeter ICL7135   LCD1601 89S52

目 录

一 前言......................................................... .....4
二 系统原理及基本框图 ................................................4
三 硬件设计 ......................................................... 5
3.1 输入电路 .........................................................5
3.2 A/D 转换电路 .....................................................5
3.2.1双积A/D 转换器的工作原理 ........................................5
3.2.2 7135的应用 .....................................................6
3.3单片机部分 .......................................................10
3.4液晶显示部分 .....................................................10
3.4.1 1601使用说明 ..................................................10
3.4.2 液晶显示部分与89S52的接口......................................13
3.5 通讯模块.........................................................14
四 系统的软件设计....................................................14
4.1主程序设计........................................................14
4.2 A/D中断程序设计..................................................16
4.3通讯模块程序设计..................................................17
结束语...............................................................18
参考文献 ............................................................19
致 谢 ...............................................................19
设计感想 ............................................................19
附录 ......................................................... ......21
1：程序清单......................................................... 21
设计电路图 ......................................................... 29