基于单片机的相对湿度检测控制器设计.doc

摘 要 随着科技的发达，以及人民生活水平的提高，人民室内生活环境不断改善，出现了空调、智能温度器、室内净化器等一系列改善人民生活条件的高科技产品。然而这并不能满足人民越来越高的生活需求，有些人提出了湿度的要求，本设计就在此基础上，设计一种基于89C51单片机控制的智能湿度控制系统。 此系统采用了精密的检测电路（包刮精密对称方波发生器、对数放大及半波整流、温度补偿及温度自动校正及滤波电路等几部分电路组成），能够自动、准确检测环境空气的相对湿度,并将检测数据通过A/D转换后，送到处理器（AT89C51）中，然后通过软件的编程，将当前环境的相对湿度值转换为十进制数字后，再通过数码管来显示；而且，通过软件编程，再加上相应的控制电路（光电耦合及继电器等部分电路组成），设计出可以自动的调节当前环境的相对湿度：当室内空气湿度过高时，控制系统自动启动抽风机，减少室内空气中的水蒸气，以达到降低空气湿度的目的；当室内空气湿度过低时，控制系统自动启动蒸汽机，增加空气的水蒸气，以达到增加湿度的目的，使空气湿度保持在理想的状态；键盘设置及调整湿度的初始值，另外在设计个过程当中，考虑了处理器抗干扰，加入了单片机监视电路。 通过对基于单片机的相对湿度控制器设计，加深对传感器技术及检测技术的了解，巩固对单片机知识的掌握，并系统的复习本专业所学过的知识。 关键词：湿度检测，对数放大，湿度调节，温度补偿 Abstract With the development of science and technology, the improvement of and the living standards of the people, the people are improving constantly in indoor living environment, the air conditioner , intellectual temperature device , high-tech products of such peoples living conditions of a series of improvement as the purifying device ,etc. in the room have appeared. But this can not meet higher and higher life demands of people , some people propose the demand for the humidity, this text is just on this basis, design one on the basis of intellectual humidity control system which 89C51 MCU controlled. This system has adopted the accurate measuring circuit (is it blow accurate symmetrical square wave generator , logarithm enlarge and halfwave rectifier , temperature compensation , temperature correct and strain wave circuit odd parts of circuit not to make up automatically to wrap up), can measure the relative humidity of the surrounding air automatically and accurately , and after measuring the data and changing through A/D, send it in the processor (AT89C51 ), Then through the programming of the software, after changing the value of relative humidity of the environment at present into the decimal digit, and then in charge of the number to show; And, through software programming, in addition, corresponding control circuit (such some circuit as photoelectric coupling and rela