本科毕业设计（论文）
题目：多路压力监测系统硬件设计
院 （系）： 电子信息工程学院 专 业： 电气工程及其自动化 班 级： 050412 学 生： 董洁茹 学 号： 050412128 指导教师： 毕雪芹
2009年 06月
多路压力监测系统硬件设计
摘要 在企业生产中，准确及时地得到压力参数对生产管理、产品质量和生产安全具有十分重要的意义。本文论述了基于单片机的多路压力监测系统硬件设计。该硬件的主要模块包括：信号采集、信号调理、结果显示、报警电路、看门狗模块。本系统运行可靠、性能稳定、性价比高、应用前景十分广阔。本文提出了针对多压力点进行计算机集中实时监测系统,介绍了它的基本原理、硬件组成，所以其结构清晰，易于修改,调试方便，大大提高了系统开发效率。
关键词：单片机；传感器；LCD显示；压力监测
I
Hardware Design of Multi-Channel Pressure Monitoring
System
Abstract In production, access to accurate and timely pressure parameters on production management, product quality and production safety is of great significance. This paper discusses the hardtware design of multi-channel pressure monitoring system based on SCM（The single chip machhine）. The main modules of the hardware include: signal acquisition, signal processing, the result showed and watchdog module. The system has reliable operation, stable performance, cost-effective and very broad prospects for application. This paper presents a multi-point pressure real-time monitoring system, and introduces its basic principle, components of hardware, so its structure is clear and easy to transplant and also convenient to debug. These greatly increase the efficiency of the system’s development.
Key words : SCM , sensors, LCD Display, Pressure Monitoring
II
目录
摘要 ...................................................................................................... I Abstract ............................................................................................. II 1 绪论 ............................................................................................... 1
1.1课题的背景................................................... 1 1.2课题的研究意义............................................... 1 1.3压力监测技术的现状及发展趋势................................. 2 1.4 课题的主要内容及技术指标 .................................... 2
1.4.1课题的主要内容 ......................................... 2 1.4.2课题的技术指标 ......................................... 2
2 系统的要求及设计原则 ................................................................. 3
2.1系统的要求................................................... 3 2.2系统的设计原则............................................... 3
3 系统硬件电路设计 ........................................................................ 4
3.1系统的组成................................................... 4 3.2系统的工作原理............................................... 4 3.3系统主要芯片简介............................................. 5
3.3.1压力变送器 ............................................. 5 3.3.2多路选择开关 ........................................... 7 3.3.3I/V转换器 .............................................. 8 3.3.4信号放大器 ............................................. 9 3.3.5A/D转换器 ............................................. 10 3.3.6单片机AT89C51......................................... 12 3.3.7 8255.................................................. 15 3.3.8外部时钟DS12877....................................... 17 3.3.9液晶显示电路 .......................................... 18 3.3.10外部存储电路 ......................................... 19
i
3.3.11报警电路 ............................................. 21 3.3.12复位电路 ............................................. 22 3.3.13串行口电路 ........................................... 24 3.3.14电源电路 ............................................. 26
4.系统电路板设计及调试 ................................................................. 28
4.1 Protel 简介 ................................................ 28 4.2 PCB布局、布线基本原则...................................... 28
4.2.1 元件布局基本规则...................................... 28 4.2.2 元件布线规则.......................................... 29 4.3 系统调试 ................................................... 29
5 结论 ............................................................................................. 31 参考文献 ........................................................................................... 32 致谢 ................................................................................................... 33 毕业设计（论文）知识产权声明 ..................................................... 34 毕业设计（论文）独创性声明 ......................................................... 35 附录 ................................................................................................... 36
ii