便携式甲醛测试仪的设计

便携式甲醛测试仪的设计(论文13000字)
摘要：社会经济的高速增长，更为先进的科学技术不断产生，生活的方式和质量发生了前所未有的改变，然而衣食住行的改变带来的不仅仅是生活上的便利，也带来了工业生产的副作用。以家居为例，哮喘，白血病等疾病的诱发跟室内甲醛的浓度超标有很大的关系，由于缺少专业设备，很难及时的预防。本设计主要针对以上问题，设计出一款便携式甲醛浓度监测装置，该监测装置不仅可以实时测量空气中的甲醛浓度，而且当甲醛浓度超过上预设的限定阈值时发出报警音提示。本设计主要有51单片机、MQ138型甲醛传感器、液晶显示器、AD模数转换器、蜂鸣器等组成。
AD模数转换器采集甲醛传感器输出的模拟量，通过单片机的处理，显示在液晶显示器上。
关键词：单片机；甲醛浓度；液晶显示；ADC采集

Design of protable formaldehyde tester
Abstract:The development of social economy, science and technology continue to improve, the hitherto unknown way to change the quality of life and the basic necessities of life, but change is not just to bring the convenience of life, but also brings the side effect of industrial production. To the home, for example, asthma, leukemia and other diseases induced by excessive concentration of indoor formaldehyde has a great relationship, due to the lack of professional equipment, it is difficult to timely prevention. This design is mainly to solve the above problem, design a portable formaldehyde concentration monitoring device, the formaldehyde concentration monitoring device not only can measure the current environment, and when the concentration of formaldehyde over the limit alarm. This design mainly has 51 monolithic integrated circuit, the MQ138 formaldehyde sensor, the liquid crystal display, the AD analog to digital converter, the buzzer and so on.

AD analog digital converter to collect formaldehyde sensor output analog, through the MCU processing, displayed on the lcd.
Key words: Single chip microcomputer; Formaldehyde concentration; Liquid crystal display; Analog-to-digital conversion
  [资料来源：http://think58.com]

目  录
1.    引言    1
1.1 国内外现状    1
1.2本论文主要内容和意思    1
2.    系统方案及原理    2
2.1  系统设计的目标    2
2.2 微控制芯片的选择与论证    2
2.2  A/D转换模块的选择    3
2.3 显示模块的选择与论证    4
3.    硬件设计    5
3.1 微控制器件的发展    5
3.1.2 51单片机    6
3.1.3 51单片机外部电路    8
3.2  甲醛浓度检测模块    9
3.3 ADC0804转换模块    9
3.4液晶显示模块    11
3.5 蜂鸣器模块    12

4.    软件设计    13
4.1 软件开发环境简介    13
4.2 系统总体流程图    14
5.    实物制作与调试    15
5.1 电路板焊接与调试    15
5.2 实物调试    16
5.2.1液晶电路的调试    16
5.2.2甲醛传感器的调试    17
5.3 调试结论    17
6.    总结与展望    17
6.1  总结    17
6.2  展望    18
参考文献    18
致谢    19
 

[资料来源：www.THINK58.com]