基于AT89C51单片机湿度检测系统的研究

湿度检测在工业、农业、国防等行业有着广泛的应用。利用单片机技术的湿度检测系统以其体积小，可靠性高而被广泛采用。本文对湿度检测系统进行了分析设计。首先，对湿度检测技术的应用领域和发展状况做了简单的介绍，同时，列举了目前湿度检测所常用方法以及各自所具有的特点。本文重点在于对该系统的硬件和软件设计。在硬件设计过程中，详细介绍了各部分电路的功能和特点。接下来，对系统中所用的湿度传感器HM1500和A/D转换芯片TLC1549作了简单的介绍。在软件设计过程中，绘制了各个程序模块的流程图，详细介绍了各个模块的作用。经过对程序反复的修改，完善了软件系统。最后，完成了对整个系统的设计。本系统具有灵敏度高、反映时间短等特点，并且具有智能化、可编程、小型便携等优点，相信本系统具有广泛的应用领域。 [来源：http://think58.com]

关键词：单片机，湿度检测，硬件系统，软件系统 
 
ABSTRACT
The humidity examination which is widely used in industry, agriculture, national defense and so on .the humidity examination which is widely used because that the system which uses microcontroller technology is volume small and reliability. This article has carried on the analysis design to the humidity examination system. First, the application and development condition of the humidity examination technology is made a simple introduction. And then, the humidity examination of commonly used method which has enumerated the characteristic as well as each one .The point of the article is the design of the hardware and software. In the process of hardware designing, the function and the characteristic of each part of electric circuits which has made a simple introduction in detail. Meanwhile, the humidity sensor HM1500 and the chip of the A/D transformation to the system in TLC1549 have been made the simple introduction. In the process of software designing, I have drawn up each program module flow chart, and introduced each module function in detail. Then to the procedure repeatedly revision, it has been consummated the software system. Finally, I has completed the over all system designing. This system have the characteristic of sensitivity high and the reflection time is short, and so on .It has the intellectualization, and programmable and small, then takes along short, and so on. It believed that this system has the widespread application .

Keywords： MCU, humidity examination，software system, hardware system [来源：http://www.think58.com]

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目  录

[资料来源：http://think58.com]

第1章  绪论 1
1.1 湿度的基本概念 1
1.2 湿度检测的应用领域 1
1.3 常见的湿度检测方法及特点 2
1.4 湿度测量技术的发展趋势 2
1.5 本课题研究的主要内容和目标 3
第2章 湿度检测系统的功能与硬件设计 4
2.1 湿度检测方案的选择 4
2.2 设计方案的确定 4
2.2.1 处理器 5
2.2.2 显示电路 5
2.2.3 键盘电路 5
2.3湿度检测仪的主电路设计 5
2.3.1 系统时钟电路设计 6
2.3.2 系统复位电路的设计 6
2.3.3 按键与按钮电路的设计 7
2.3.4 系统的显示电路设计 8
2.3.5 电源设计 9
2.3.6 湿度检测传输及A/D转换电路 10
2.3.7 硬件电路原理图 11 [资料来源：http://www.THINK58.com]
2.4器件的选择及说明 12
2.4.1 AT89C51单片机简介 12
2.4.2 湿度传感器HM1500 14
2.4.3 A/D转换芯片TLC1549 15
第3章 软件系统设计 17
3.1 主程序 17
3.2 系统各程序模块 18
3.2.1 湿度测量采集子程序流程图 18
3.2.2 键盘处理子程序流程图 19
3.2.3 超湿报警子程序流程图 20
3.3系统抗干扰技术 21

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