摘要:湿度、温度和大气压力都是比较重要的物理量，这些物理量和我们的生活，工作都密切相关。有关温度、湿度和大气压力的测量及控制技术广泛的运用到各个领域，包括食品仓储、工农业生产、气象监测、工业生产、科学研究及其日常生活当中。能够为指导生产活动提供有力的科学依据。
本课题的主要任务就是完成一个有高精度的湿度、温度和大气压力测量系统。通过综合分析了国内外湿度温度和大气压力测量技术，加上自己所学习到的一些专业知识，提出了将各个传感器与单片机AT89C52相结合的设计方案，并且完成相应的硬件电路设计。该系统的数据采集主要是运用比较实用的传感器，温度的测量用的传感器DS18B20；湿度的测量用的传感器是HS1 101；大气压力测量用的传感器是MPX4115系列。除了温度的测量直接送到单片机外，湿度和大气压力的测量都要经过AD转换TLC1543后再送给单片机。为了充分利用好TLC1543的端口和提高测量的精确度，则在数据采样中采集多路数据并取平均值。
本课题的温度、湿度及其大气压力测量仪简单可靠，而且可文护性好，测量精度也比较高。同时，它可以一机多用，能够方便地应用于普通环境空间布点的湿温及其大气压力的测量，应该是具有重要的经济价值和实用价值。
毕业论文关键词： 单片机AT89C52；湿温及其大气压力测量；传感器；AD转换
Multifunction Tester Computer Hardware Design
Abstract: Humidity, temperature and barometric pressure are more important physical quantities, these quantities and our lives are closely related to the work. About temperature, humidity measurement and control technology and a wide range of atmospheric pressure applied to various fields, including food storage, industrial and agricultural production, weather monitoring, industrial production, scientific research and its daily life.
The main task of this project is to complete a precision of humidity, temperature and atmospheric pressure measurement system. Through a comprehensive analysis of the domestic and humidity temperature and atmospheric pressure measurement technology, coupled with their own expertise to learn some of the proposed sensor and the microcontroller AT89C52 each combination of design, and complete the corresponding hardware circuit design. The data
acquisition system is mainly the use of more practical sensors, sensor DS18B20 temperature measurement used; measuring humidity sensor is used HS1 101;atmospheric pressure measurement sensor is MPX4115 series. In addition to measuring the temperature directly to the microcontroller,the humidity and barometric pressure measurement to go through the AD converter TLC1543 then gave microcontroller.
The topic of temperature, humidity and atmospheric pressure measuring instrument is simple, reliable, and good maintainability, the measurement accuracy is relatively high. Meanwhile, it can use a machine that can be easily applied to wet temperature and atmospheric pressure measurement space distribution of the general environment should be of great economic value and practical value.
Keywords: microcontroller AT89C52; wet temperature and atmospheric pressure ;measurement ;sensor AD conversion.
目录
第一章 绪论 1
1.1 课题的背景和意义 1
1.2 国内外研究现状 2
1.2.1 湿度的测量 2
1.2.2 温度的测量 3
1.2.3 大气压力的测量 4
1.3 本课题的主要任务 4
第二章 系统总体方案的设计 5
2.1 设计需求 5
2.2 技术要求 5
2.3 总体方案的设计 5
第三章 课题中所使用的元器件 7 AT89C52单片机大气压力湿度温度测量系统硬件设计+电路图:http://www.youerw.com/zidonghua/lunwen_16024.html