1、 I 摘摘 要要 在 21 世纪的今天,随着经济的发展,温度及湿度的测量和控制对人类日常 生活、工业生产、气象预报、物资仓储等都起着极其重要的作用。在许多场合, 及时准确获得目标的温度、湿度信息是十分重要的,近年来,温湿度测控领域发 展迅速, 并且随着数字技术的发展, 温湿度的测控芯片也相应的登上历史的舞台, 而在食品行业也在广泛应用者。食品都是有保质期的,所以食品温湿度的保持对 其质量的保障显得尤为重要。 针对此领域的发展方向,本文介绍了温湿度自动检测系统。本系统是以 AT89S51 单片机为控制单元、温度传感器 AD590、湿度传感器 SH1101 为主要检测 器件,实现温度、湿度的测量、
2、显示、报警、保存。 关键词:关键词:单片机 温湿度 A/ D 转换 II A Abstractbstract In the 21st century today,With the development of economy, moisture and humidity measurement and control of human daily life, industrial production, weather forecast, material storage and so on all play a very important role. On many occasions,
3、to obtain the target temperature and humidity accurately and timely information is very important, in recent years, the temperature and humidity measurement and control field is developing rapidly, and with the development of digital technology, temperature and humidity measurement and control of th
4、e chip also corresponding boarded the stage of history, In the food industry are also widely applicators. Food is a shelf life, so keep food temperature and humidity on the quality of its security is particularly important. For this area of development, this paper, based on the temperature, humidity
5、 detection system. AT89S51 SCM is the system for the control unit, temperature and humidity sensor SH1101 as the main detection devices, temperature, humidity measurements, display, alarm and preserve. K Keywordseywords: single chip temperature and humidity A/ D transfer III 目目 录录 第第 1 1 章章 绪绪 论论. -
6、 1 - 1.1 选题背景及意义. - 1 - 1.2 设计过程及工艺要求. - 2 - 1.2.1 基本功能. - 2 - 1.2.2 主要技术参数. - 3 - 第第 2 2 章章 方案的比较和论证方案的比较和论证 - 4 - 2.1 温度传感器的选择. - 4 - 2.1.1 采用热电阻温度传感器. - 4 - 2.1.2 采用 AD590 温度传感器. - 5 - 2.2 湿度传感器的选择. - 5 - 2.2.1 采用 HOS-201 湿敏传感器. - 5 - 2.2.2 采用 HS1100/HS1101 湿度传感器. - 6 - 2.3 A/D 转换器的选择 - 6 - 2.3.1 采用 AD7874 转换器. - 6 - 2.3.2 采用 ADC0809 转换器. - 7 - 第第 3 3 章章 系统硬件设计系统硬件设计 - 8 - 3.1 信号采集. - 8 - 3.1.1 温度传感器. - 8 - 3.3.2 湿度传感器. - 11 - 3.2 信号分析与处理. - 14 - 3.2.1 A/D 转换 - 14 - 3.3 单片机 AT89S51 -