电子测量大作业-甲醛检测系统设计

华东交通大学

电子测量大作业

题目甲醛检测系统的设计课程名称电子测量

院部名称信息工程学院

专业通信工程

班级 11 通信xx

学生姓名 xxx 学号 2011xxx

指导教师黄德昌

摘要

随着社会的发展，生活质量的提高，越来越多的人们意识到房屋装修所残留的气体对人体的伤害，而房屋装修所残留的气体主要为甲醛。甲醛对人体健康有较大的危害，许多疾病的诱发都与甲醛有关，如哮喘，白血病等。对此我们研究并设计了一种用于检测室内气体中所含甲醛含量的检测系统。该检测系统具有显示甲醛含量以及超标报警的功能。该系统设计方案是基于AT89C52单片机，选择MQ138型甲醛传感器。在系统中传感器模块输出的标准电流经由A/D转换电路转换为单片机能识别的信号，单片机对此信号进行处理，最后将甲醛含量显示在LCD上，并在甲醛含量超标时进行报警。

关键词：甲醛；单片机；传感器

Abstract

With the development of social, improved of life, more and more people realize the damage of the housing renovation residual gases on the human body, housing renovation of the residual gas is mainly for formaldehyde. Formaldehyde greater harm to human health, many diseases induced is relevant to formaldehyde, such as asthma, leukemia, etc. We study and design a detection system is used to detect indoor gas contained formaldehyde content. The detection system shows the formaldehyde content and Alarming. The system design based on AT89C52, select MQ138type formaldehyde sensor. Through the A/D converter circuit to convert the signal for the MCU can identify in the standard current output of the sensor module, MCU processing of this signal, finally, the formaldehyde content is displayed on the LCD, and alarm excessive levels of formaldehyde.

Key words: Formaldehyde; Singlechip; Sensor

目录

摘要------------------------------------------------------------------------------1

第一章绪论------------------------------------------------------------------3 1.1 引言------------------------------------------------------------------------3 1.1.1甲醛的特性及危害----------------------------------------------------3 1.1.2甲醛的来源-------------------------------------------------------------3 1.2甲醛检测仪的种类-------------------------------------------------------3 第二章传感器与处理器的介绍------------------------------------------4 2.1传感器----------------------------------------------------------------------4 2.2处理器----------------------------------------------------------------------4 第三章仪器方案设计------------------------------------------------------4 第四章硬件设计------------------------------------------------------------6 4.1 系统总体结构及工作原理----------------------------------------------6 4.2系统主要模块介绍-------------------------------------------------------6 4.2.1数据采集模块----------------------------------------------------------6 4.2.2数据显示模块-----------------------------------------------------------7 4.2.3报警电路----------------------------------------------------------------8 4.2.4数据转换模块----------------------------------------------------------9 第五章软件设计------------------------------------------------------------10 5.1编写语言及编写软件简介-----------------------------------------------10 5.2注程序模块-----------------------------------------------------------------10 5.3A/D转换流程图-----------------------------------------------------------10- 5.4 LCD显示流程图----------------------------------------------------------11 5.5按键流程图-----------------------------------------------------------------11 5.6系统仿真--------------------------------------------------------------------12 第六章总结与展望---------------------------------------------------------13 参考文献------------------------------------------------------------------------14