基于单片机的温湿度测量系统的研究与设计

基于单片机的温湿度测量系统的研究与设计

摘要

温湿度的测量应用范围是很广的,对温湿度测量系统的研究也具有深远意义，本课题针对国内外对温湿度测量系统的研究与发展状况，分析了目前温湿度测量系统存在的主要问题，设计了一种基于单片机的温湿度测量系统，对某些有着特殊要求温度和湿度的场合实现长期、稳定、实时、自动的监测。本设计主要由硬件电路和软件电路两部分组成，系统通过温湿度检测电路，把采集到的信号传给单片机，通过单片机来处理采集到的信号并通过LCD显示出来，如果温湿度过高或过低，报警电路会自动报警。它以AT89C52单片机为核心，采用SHT11集成温湿度传感器实现一种智能、快捷、方便的温湿度测量系统，整个系统由温湿度检测电路、时钟电路、LCD显示电路、键盘电路、报警电路和单片机等组成。设计的系统结构简单紧凑，功耗较低，抗干扰能力强、总体性能比较好，符合了智能仪器仪表小型化的潮流，为今后开发高性能和商品化的温湿度测量仪器奠定了良好的基础。

关键词：单片机；温湿度；SHT11传感器

ABSTRACT

The temperature and humidity measurement range is very wide application, the temperature and humidity measurement system research also has far-reaching significance, the subject of temperature and humidity measurement system at home and abroad for the research and development condition, temperature and humidity measurement system are analyzed, the main problems of the design based on

single-chip processor of the temperature and humidity measurement system, and for some has special requirements of temperature and humidity achieve long-term, stable, occasion real-time, automatic monitoring. This design mainly by the hardware circuit and software circuit two parts, the system through the temperature and humidity detection circuit, gathering the signal to the microcontroller, through the single chip microcomputer to handle the collected signals and through the LCD display, if the temperature and humidity too high or low, the alarming circuit will automatically alarm. AT89C52 single chip microcomputer to it as the core, and adopting the integrated

SHT11 temperature and humidity sensor implement an intelligent, fast and convenient temperature and humidity measurement system, the whole system consists of temperature and humidity detection circuit, clocking circuit, LCD display circuit, keyboard circuit, alarm circuit and single-chip microcomputer etc. The design of the system simple and compact structure, low power consumption, the anti-interference ability strong, overall performance is better, in line with the intelligent instruments miniaturization trend in future for the development and commercialization of high performance of temperature and humidity measurement instrument has laid a good foundation.

Keywords: SCM; The temperature and humidity; SHT11 sensor

目录

摘要................................................................ I ABSTRACT ............................................................ I I 目录.............................................................. I II 第一章绪论 (1)

1.1概述 (1)

1.2国内外研究现状 (1)

1.2.1 国外研究现状 (1)

1.2.2 国内研究现状 (1)

1.3温湿度检测的发展状况以及存在的问题 (2)

1.4课题研究的主要内容 (3)

第二章系统硬件部分设计 (4)

2.1AT89C52单片机介绍 (4)

2.2温湿度测量电路的设计 (9)

2.2 .1 SHT11简介 (9)

2.2.2 SHT11主要性能特点 (9)

2.2.3 SHT11工作原理 (11)

2.2.4 SHT11输出特性 (12)

2.2.5运行条件 (13)

2.2.6 安装注意事项 (13)

2.2.7 SHT11与单片机连接 (13)

2.3LCD显示电路设计 (14)

2.3.1 LCD1602简介 (14)

2.3.2 LCD1602的特性 (14)

2.3.3 LCD1602引脚功能 (14)

2.3.4 指令集 (15)

2.3.5 LCD1602与单片机连接 (16)