《基于单片机的空气质量远程检测系统》-毕业论文（设计）.doc

毕 业 设 计（论文） 题 目： 基于单片机的空气质量远程检测系统 学生姓名： 学 校： 河北工程大学 专 业： 班 级： 指导教师： 2014 年 05 月 26 日 摘要 近些年来空气污染、雾霾等成为人们日常讨论的主要问题之一，空气污染已经导致了一些人类健康的问题，而且这种趋势越来越严重。目前二氧化硫是空气中的最主要的污染物，人们对二氧化硫有害物的监测力度越来越重视，现在对二氧化硫气体有很多种监测方法。本设计是一种用于监测空气中二氧化硫浓度的仪器，可用作为对远程空气环境监测中的二氧化硫浓度的监测。 本设计详细的介绍了目前经常用于测量二氧化硫的方法以及所采用的电化学传感器的工作原理和运行特性，所使用的STC90C51单片机的特点和性能，以及RS232串口通信，AD转换，液晶显示的原理等相关的的问题。介绍了从方案设计，器件选择，电路设计，程序设计，及仪器进行零点标定，浓度标定和校准的一个完整的思路。设计的以90C51为核心的测量系统达到了测量二氧化硫的目的，测量结果有液晶屏显示出来，通过串口线可以和上位机进行通信，上位机也可以通过串口线来改变仪器的报警值，报警器根据预先设定的报警值进行报警。 关键词：空气污染，二氧化硫；浓度；监测；STC90C51 Abstract One of the main problems in recent years, air pollution, haze and so become an everyday discussion, air pollution has led to a number of human health problems, and this trend is getting worse. Sulphur dioxide is currently the most important pollutants in the air, people are harmful sulfur dioxide monitoring efforts more and more attention, there are many methods for monitoring sulfur dioxide gas. This design is monitoring the concentration of sulfur dioxide in the air for an instrument that can be used as a remote air concentrations of sulfur dioxide in the monitoring of environmental monitoring. A detailed description of the design principles of the current working methods are often used to measure sulfur dioxide and electrochemical sensors used and operating characteristics, features and performance are used STC90C51 microcontroller and RS232 serial communication, AD converter, LCD principles The problems associated. This section describes the zero calibration, calibration and calibration concentration from program design, component selection, circuit design, process design, and equipment of a complete thought. 90C51 core designed to achieve the purpose of the measurement system to measure sulfur dioxide, the measurement results are displayed with an LCD screen, and the h