湿度检测与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、报警与初始值的改变。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与显示，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 humidityElectronic Information Science and Technology 07-2 Shi Fei-feiSupervisor Ma Feng-xiangAbstractHumidity 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 slowReaction, so that can not meet the requirements of certain occasions.Achievingacquisition 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 thevalue 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 ...
