摘要随着经济的飞速发展，国民的消费水平也随之提升，人们将各种新颖的装修材料 用于家庭装修。这些装修材料给人们带来的不仅仅是视觉享受，它们所散发出的各种 有害气体严重污染了室内空气质量，无形中给人们的健康造成极大的威胁。79795

本课题针对室内空气污染这一问题，选用 AT89S52 单片机作为控制器，实现室 内空气温湿度，甲醛含量及烟雾数据的实时采集、显示、报警及自动调节家电工作状 态等功能。系统选用 SHT11 温湿度传感器和 Dart Sensors 甲醛传感器组成数据采集电 路，获取空气中的温湿度和甲醛含量；选用 PCF8591 作为 A/D 转换器，将模拟甲醛 含量、烟雾含量及空气质量的电压转换为数字量；选用 LM016L 作为液晶显示屏，实 现实时显示功能；选用 LED 灯和蜂鸣器组成报警电路，实现声光报警；选用 LED 灯 和电机组成家电控制电路，实现调整家电工作状态的功能。用户还可以根据室外天气 状况，自主调节系统内各个参数的值，给自己营造一个舒适的生活或工作环境。最后， 使用 Proteus 软件搭建模拟电路，进行仿真，验证系统的有效性。

毕业论文关键词：AT89S52；液晶显示；室内空气质量；甲醛

Abstract With the rapid development of economy, the level of consumption of the people also will be promoted, people will be a variety of innovative decoration materials for home decoration。 These decoration materials to the people not only bring visual enjoyment, they emit a variety of harmful gases seriously pollute the indoor air quality, invisible to people's health caused great threat。

This topic according to indoor air pollution is a problem, choose AT89S52 microcontroller as the controller, the indoor air temperature and humidity, formaldehyde content and smog data real-time acquisition, display, alarm and automatically adjust the working state of the household appliances, and other functions。 System uses SHT11 temperature and humidity sensors and dart by formaldehyde sensor to form a data acquisition circuit, access to the air temperature and humidity of the formaldehyde content; pcf8591 is selected as the A / D converter, which converts the analog formaldehyde content, smoke concentration and air quality of the voltage conversion to digital quantity; with lm016l as liquid crystal display, real-time display function; selection of LED lights and buzzer warning circuit, which is composed of, to achieve the sound and light alarm; to use LED lights and electrical appliances control circuit is composed of, adjust the working state of the household appliances。 Users can also according to the outdoor weather conditions, the values of the various parameters of the system, to create a comfortable life or work environment。 Finally, using Proteus software to build the analog circuit, simulation, verify the effectiveness of the system。

Keywords: AT89S52; liquid crystal display; indoor air quality; formaldehyde

目 录

第一章 绪论 1

1。1  课题的背景和意义 1

1。2  国内外研究现状及问题 1

1。3  本文研究的主要内容 2

1。4  论文组织结构 3

第二章 室内空气质量简介 4

2。1  室内空气质量指数 4

2。2  室内空气质量监测及改善方法 5

2。3  本章小结 7

第三章 空气质量监测系统硬件设计 8