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论文编号:ZD1293 论文字数:17794,页数:44 附外文翻译，原理图，答辩PPT
摘 要
随着社会的进步，人们环保意识的提高，大气环境检测越来越重要，特别是城市人口的急剧增加，大气污染已经变得日益严重。本文通过对大气环境检测对象作了初步研究和探讨，分析了大气环境中的主要污染物以及相关检测标准，而后结合实际情况，对大气中的温度、湿度、噪音强度进行的检测与记录。在分析其工作原理之后确定了系统的控制结构，控制技术，控制策略和控制芯片等，并进行系统硬件电路的设计和软件程序的编写。
基于单片机对数字信号的高敏感和可控性、温湿度传感器可以产生模拟信号，和A/D模拟数字转换芯片的性能，我设计了一套检测系统，其中包括A/D转换、单片机、复位电路、温度检测、湿度检测、噪音强度检测、键盘及显示、系统软件等部分的设计。用AT89C51处理来自温度传感器DS18B20的数据，以及通过ADC0809转换后的湿度传感器HM1500和音频放大电路的数据，AT89C51读取数据后将数据送到缓冲区内, 通过LED 数码管进行实时显示。显示电路部分用HD7279A与单片机相连，由9个共阴极LED数码管组成。9个LED数码管用于显示温度、湿度和噪音强度。
关键词：DS18B20 HM1500 ADC0809 AT89C51 HD7279A
Atmospheric environment examination recording instrument
Abstract
Along with society''s progress, the people environmental protection consciousness enhancement, the atmospheric environment examination is more and more important, specially the urban population sharp growth, the air pollution already became day by day serious.This article through has done the preliminary study and the discussion to the atmospheric environment examination object, has analyzed in the atmospheric environment main pollutant as well as the correlation detection standard, after but unifies the actual situation, to in the atmospheric temperature, the humidity, the noise intensity carries on the examination and the record.After analyzes its principle of work had determined the system control structure, the control technology, the control strategy and the control chip and so on, and carry on the system hardware electric circuit the design and the software procedure compilation.
Based on the monolithic integrated circuit to the digital signal high sensitive and the controllability, the humiture sensor may produce the simulated signal, with the A/D analog-digital transformation chip performance, I designed a set of examination system, electric circuit, temperature examination, humidity examination, noise intensity examination, keyboard and demonstration, system software the part and so on transformed, the monolithic integrated circuit including A/D, repositions designs.Processes with AT89C51 comes from the temperature sensor DS18B20 data, as well as transforms after through ADC0809 humidity sensor HM1500 and the audio frequency amplification electric circuit data, after AT89C51 read data delivers the data in the buffer, carries on the real time display through the LED nixietube. The display circuit part is connected with HD7279A and the monolithic integrated circuit, is composed by 9 common cathode LED nixietube.9 LED nixietubes use in demonstrating the temperature, the humidity and the noise intensity.
Keywords ：DS18B20 HM1500 ADC0809 AT89C51 HD7279A
目 录
第一章 绪论 1
1.1 选题背景 1
1.2 国内外研究情况 2
1.3 本文主要研究的内容 2
第二章 方案的论证 4
2.1 设计过程及工艺要求 4
2.2 CPU的选择 4
2.3 传感器的选择 5
2.3.1 温度传感器的选择 5
2.3.2 湿度传感器的选择 6
2.3.3 噪音传感器的选择 7
第三章 系统硬件图 9
3.1 原理结构图 9
3.2 单片机最小系统 9
3.3 温度传感器 13
3.4 湿度传感器 19
3.5 噪音强度检测 23
3.6 键盘、显示电路设计 25
第四章 软件部分 28
4.1主程序流程图 28
4.2 子程序流程图 29
4.2.1. 湿度转换子程序流程图 29
4.2.2. 检测温度子程序流程图 30
4.2.3．噪音强度转换子程序流程图 32
总 结 34
致 谢 35
参考文献 36
附录A 程序清单 38
附录B 系统硬件图 43
