摘要：随着生活水平的提高，人们对日常生活居住的环境要求越来越高，其中温湿度的适宜显得有尤为重要。同时，温湿度在工农业研究以及科研试验中影响也是有的，因此，对温湿度的监测系统的研究就显得很有意义并且值得探索。这次毕业设计的题目就是 基于单片机的室内温湿度监测系统的设计。设计的系统是可分为硬件电路和软件电路两 个部分。在设计中，先通过温湿度传感器检测室内环境参数，再将采集的信号传给单片 机，本次设计采用的是AT89C52单片机。最后由单片机将收集的信号经过转换处理并经由 液晶显示，如果室内温湿度高于或低于设定的温湿度范围，那报警系统会进行报。通过L ED指示灯亮灯的情况还可以具体了解到是温湿度数值哪个超出范围的情况。70296不全

毕业论文关键词：单片机，温湿度，监测

Abstract：As living standards improve, people's living environment requires higher and higher everyday life, which appears to have a suitable temperature and humidity is particularly important. Meanwhile, the influence of temperature and humidity in the industrial and agricultural scientific research and experiments are some exceptions, therefore, temperature and humidity monitoring systems research becomes meaningful and worth exploring. The graduation project is micro controller-based indoor temperature and humidity monitoring system. The whole system is composed of two parts, hardware and software circuit. In the design, the first through the indoor temperature and humidity sensors to detect environmental parameters, signals to the micro controller then collected, this design uses AT89C52 micro controller. Finally, after the conversion by the signal processing and micro controller will be collected via the LCD, if the indoor temperature and humidity is above or below the set temperature and humidity range, that alarm will be reported. By observing the LED lights to know which data is out of a predetermined range.

Keywords:  Single chip microcomputer，temperature and humidity， detection

目 录

1 绪论 5

1.1 课题研究背景 5

1.2 温湿度检测的发展现状和发展趋势 5

1.2.1 国外发展现状和趋势 5

1.2.2 国内发展现状及趋势 5

1.3 本课题主要研究内容 6

2 系统总体设计的方案 6

2.1 设计过程及要求 6

2.2 系统总体概述 6

3 室内温湿度监控系统的硬件设计 7

3.1 整体方案的选择 7

3.1.1传感器的选型 7

3.1.2 单片机的选择 8

3.2单片机系统模块 8

3.2.1 AT89C52简介 8

3.2.2 最小系统模块的电路 11

3.3 DHT11传感器电路的设计 12

3.3.1 DHT11传感器的简介 12

3.3.2 接口设计 12

3.3.3 DHT11电路图 13

3.4 液晶显示设计