电子机电论文编号:JD942   论文字数:15098,页数:35

                　　　
目  录
摘要……………………………………………………………………………….1
Abstract…………………………………………………………………………...2
前言……………………………………………………………………………….4
第一章  系统结构及原理……………………………………………………….5
1.1系统的测量原理 5
1.2系统的工作原理 5
1.2.1 电容量与电压值的转换 5
1.2.2 系统方案设计.……………………………………………………7
        1.2.3 系统的方框图…………………………………………………….7
第二章  单元模块设计………………………………………………………….9
2.1 单片机的选择 9
2.2 波形产生芯片ICL8038 10
        2.2.1 ICL8038的引脚图和功能方框图………………………………10
       2.2.2 ICL8038的应用电路…………………………………………….11
2.3 显示模块的实现 12
        2.3.1 MAX7219的内部结构…………………………………………..12
       2.3.2 MAX7219的数据格式…………………………………………..13
       2.3.3 MAX7219的工作时序和寄存器………………………………..14
2.4 有效值转换芯片AD637 15
2.5  A/D转换模块 17
         2.5.1 MAX187的引脚说明及时序图………………………………..17
        2.5.2 MAX187的硬件连接图………………………………………..19
第三章 系统软件设计.…………………………………………………………21
3.1主程序部分…………………………………………………………….21
3.2 PC界面的设计 22
         3.2.1 组态王工作原理…………………………………………….....24
        3.2.2 人流监控系统界面简介……………………………………….25
        3.2.3 组态王与单片机通信协议…………………………………….26
第四章 电路的制作与调试…………………………………………………….28
4.1 电路板的设计原理与制作 28
         4.1.1 电路板的设计原理..…………………………………………...28
        4.1.2 电路板的制作………………………………………………….29
        4.1.3  PCB装备.…………………………………………………….30
4.2  EEPROM接口电路 31
第五章 结束语…………………………………………….……………………32
致 谢……..……………………………………………….……………………..33
参考文献………………………………………………………………………...34

 摘  要

 在工业控制历史上，压力容器的液位测量占据着很重要的角色。说到液位测量，就会让人想起工业控制现场的各种反应容器。由于压力容器的液位不能直接进行测量,要通过传感器转换电路才能得到液位高度的电信号。本论文是了基于ATMEL公司生产的单片机AT89S5２单片机为核心，通过平板式电容传感器的原理，将液位的变化转换成平行板电容器电容变化量的测量，参考电容的引入，使得液位浓度的变化不会影响液位高度的测量。将从平板式电容传感器信号调理电路得到的电信号，送入单片机AT89S52进行相关的处理。单片机将检测到的液位信息通过RS485总线传送给PC机，在PC机端，使用组态软件（组态王）对单片机传送来的液位信息进行动态显示。经综合测试，本装置具有一定的使用价值。

 关键词：压力容器；平板式电容传感器；RS485；组态王

 Abstract
In the industry control history, the pressure vessel fluid positionsurvey is occupying the very important role. Speaks of the fluidposition survey, can let the person remember the industry to controlthe scene each kind of reaction vessel. Because the pressure vesselfluid position cannot directly carry on the survey, must be able toobtain the fluid position altitude through the sensor switchingcircuit the electrical signal. The present paper was the monolithicintegrated circuit AT89S5 2 monolithic integrated circuits whichproduced based on ATMEL Corporation is a core, through the plateMAX187typeelectric capacity sensor principle, transformed the fluid positionchange the plate capacitor electric capacity change quantity survey,referred to the electric capacity the introduction, caused the fluidposition density the change not to be able to affect the fluidposition altitude the survey. Will recuperate the electrical signalfrom the plateMAX187type electric capacity sensor signal which the electriccircuit will obtain, will send in monolithic integrated circuitAT89S52 to carry on the correlation processing. The monolithicintegrated circuit will examine the fluid position informationtransmits through the RS485 main line for PC machine, in the PCmachine end, use configuration software (configuration king) the fluidposition information which transmits to the monolithic integratedcircuit carries on the dynamic demonstration. After the synthesistest, this installment has the certain use value

Keywords:Pressure vessel;PlateMAX187type electric capacity sensor; RS485;Kingview