基于单片机湿度测量电路设计研究 毕业设计论文.doc.docVIP

基于单片机湿度测量电路设计研究 摘要： 在工业生产、气象、环保、国防、科研、航天等部门，经常需要对环境温湿度进行测量和控制，准确测量温湿度对于生物制药、食品加工、造纸等行业更是至关重要。但是相比而言，测量湿度要比测量温度更加复杂，这是因为温度是个独立的被测量，而湿度却受到大气压和温度的影响。 而且在社会信息科学的发展过程中，控制理论和电子技术也在不断更新，基于微控制器的高度智能化测控技术逐步成为现实。其中以单片机为核心实现数字控制器因其体积小、成本低、功能强、简便易行而得到了广泛的应用。湿度测控由于其重要性的日益突出，技术也越来越成熟。本文主要讨论基于单片机的湿度元件检测系统设计研究。 本系统以湿度传感器 HS1101作为测量的器件，所得到的数据经过8脚时基集成电路NE555振荡电路处理后，通过ADC0809模数转换器件接入到AT89S51单片机，以单片机为核心对数据进行记录、存储、处理和报警。本文在设计过程中首先，讨论并选择系统的总体设计方案；其次，对传感器、A/D转换器和单片机进行设计和选择；再次，对单片机及其跟PC机进行通信的接口进行电路及软件系统的设计等几个方面为主做了系统的研究。 本系统的设计还处于理论阶段，是在论证了各种方案和搜集了各种的资料后提出的一种切实可行的室内湿度监测系统。本系统完全满足一般小室内环境的湿度测控系统的要求，实现了对室内湿度状况的全面、实时和长期的监测，也实现了室内湿度检测的自动化智能化。 关键词：单片机，湿度，传感器，模数转换器件，A/D转换器。 In industrial production, weather, environmental protection, scientific research, national defense, aerospace and other departments, often need to environmental temperature and humidity measurement and control, accurate measurement of temperature and humidity for pharmaceutical, food processing, paper and other industries is crucial.But in contrast, measurement of humidity than the measured temperature is more complex, this is because the temperature is an independent being measured, and the humidity is subjected to atmospheric pressure and temperature effects. But also in the social information science development, control theory and electronic technology also is being updated ceaselessly, microcontroller based highly intelligent control technology is gradually becoming a reality.The single chip microcomputer as the core digital controller because of its small volume, low cost, strong function, convenient and widely used.Humidity control because of its importance is outstanding day by day, more and more mature technology.This paper mainly discusses the humidity based on single element detection system design and research. The system is based on the HUMIREL humidity sensor HS1101 as the measuring device, the obtained data after 8 feet a time-base integrated circuit NE555 treated by ADC0809 oscillating circuit, anal