湿度检测及报警系统的设计.doc

北京林业大学本科毕业论文(设计) PAGE \* MERGEFORMAT I 湿度检测及报警系统的设计 电子信息科学与技术 07-2班 石飞飞 指导老师 马凤翔 摘要 湿度在日常生活中起着重要的作用，例如食品的存储、图书的收藏、植物的生长等都需考虑湿度。因此湿度的测量也越来越得到了人们的关注，但一般的湿度计的精确度较低，为±5%或±7%，而且反应速度慢，不能满足某些场合的要求。 以STC89C51RC单片机为核心，利用hih4000-3湿度传感器输出电压与湿度的关系，通过LM258组成的现场采集隔离电路，A/D转换电路，实现湿度信号的采集，通过LED显示电路，按键电路，报警电路实现湿度值的实时显示、报警及初始值的改变。利用Proteus仿真软件实现电路原理图的仿真，使用Keilc软件，运用C语言编程。结果证明，该系统能够快速实现湿度的采集及显示，且精度小于±5%，实时性效果好。 关键词： 湿度,单片机,显示, 报警 The design of detection and alarming system of humidity Electronic Information Science and Technology 07-2 Shi Fei-fei Supervisor Ma Feng-xiang Abstract Humidity plays an important role in our day life ,for example, when Food is stored , Books are collectted, Plants Grow ，humidity are need to be considered。Therefore, measurement of humidity has Received more and more attention。But the general hygrometer has a Low accuracy of ±5% or ±7%, and a slow Reaction, so that can not meet the requirements of certain occasions. Achieving acquisition of Humidity Signal by using the relationship between output voltage and humidity of hih4000, isolation circuit consisted of by LM258，and the A / D converter circuit， to STC89C51RC as the core . Displayying the value ??of humidity in real-time and alarmming when the value ??of humidity Out of range and setting the initial value through the LED display circuit, key circuit and alarmming circuit . Using proteus for simulation and using Keilc software and C to program. The results proved that the system can quickly capture and display humidity, and the accuracy is better than ± 5%.In addition,the system has a effective real-time. Key words: humidity, SCM, display, alarmming 目录 TOC \o 1-4 \h \z \u HYPERLINK \l _Toc295484094 1 引言 PAGEREF _Toc295484094 \h 1 HYPERLINK \l _Toc295484095 1.1 湿度监测系统设计的背景 PAGEREF _Toc295484095 \h 1 HYPERLINK \l _Toc295484096 1.2 湿度的介绍 PAGEREF _Toc295484096 \h 1 HYPERLINK \l _Toc295484097 1.3 本设计的内容及意义 PAGEREF _Toc295484097 \h 2 HYPERLINK \l _Toc295484098 1.4 湿度测量方法及注意事项 PAGEREF