智能环境参数检测仪

摘要I摘要温度是一个基本的物理量，几乎所有的科研和生产过程都和温度息息相关。准确获取系统的环境参数有助于对设备仪器的工作状态进行监控，因而，准确地测量和控制温度，对于获得正确的科研数据和保证产品质量都十分重要。本论文研究设计出一套多点温度测量系统，该系统具有测量精度高，控制范围广，抗干扰能力强等特点，可适用于科学研究及工农业生产等不同领域对温度测量的需求。在本文中，先分析了现有的几种不同的温度测试方法，并在对比各种不同方法的优缺点的基础上，考虑系统本身测试要求以及精度速度等指标要求，选择数字温度计DS18B20作为本系统的传感器，采用LCD1602液晶双行显示芯片，分别显示温度传感器的测量温度值、温度最高上限值和测量时间的预设值。在选型的基础上设计了硬件系统以及相应的检测系统，通过综合调试，实现系统的测试和报警功能。关键字：多点温度传感器网络，单片机，温度测量ABSTRACTIIABSTRACTTemperatureisabasicphysicalfactor,almostallofthescientificandindustryworkhaveawaywithtemperature.Obtainingtheseparametercorrectlycanhelpustogaintheinstrument’sstate.So,howtocontroltemperatureaccurately,isveryimportantinscientificresearchandindustryquality.Inthissituation,designandimplementoneapplicablesystemwhichcanwatchmeasureandcontrolthetemperatureandthemeasuringresultsisrealtimeandtheprecisionisgreatismoreessential.Ittakesagreatoftroublesfortheindustry-controllerstomakedecision.Thispaperfirstanalyzedsomekindsofmethodabouttestingthetemperatureandthehumidity.Thenbalancethedifferentmethod’sdisadvantages,advantages,andtheusingsystem’smeteragerequirementabouttheprecision,testingrate,andsoon.AndthenchoosingthedigitalthermometerDS18B20.AndsettheTI’sMCU,LCD1602,asmainprocessor.Basedonthiswork,designedahardwarecircuit.Thiscircuitcanachievethetestingfunction.Weusethetemperaturechesttodemarcatethesystem.Keywords:Multi-PointTemperatureSensorNetwork,single-chipmicrocomputer，Temperaturemeasurement目录III目录第1章引言....................................................................................................................11.1概述.............................................................................................................................11.2目前国内外研究现状................................................................................................11.3课题设计的目的和意义............................................................................................21.4论文主要内容............................................................................................................31.5多点温度测量系统整体结构分析............................................................................4第2章多点环境监测系统的总体设计........................................................................52.1具体方案.....................................................................................................................52.2系统主要技术参数.....................................................................................................62.3本论文中元器件的选择.............................................................................................72.3.1数字温度传感器概述..............................................................................................72.3.1.1DS18B20性能参数介绍........................................................................................82.3.1.2DS18B20的测温原理..........................................................................................102.3.1.3DS18B20自动搜索算法......................................................................................112.3.1.4DS18B20编程设计..............................................................................................142.3.2AT89S52微控制器相关介绍.................................................................................222.3.3DM-1602液晶显示器简介....................................................................................242.3.4MAX232串口芯片简介.........................................................................................29第3章系统的硬件结构设计及程序编程..................................................................313.1稳压电路设计...........................................................................................................313.1.1稳压电源的组成....................................................................................................313.1.2稳压电路设计.......................................................................................................323.2温度数据处理算法分析及程序设计......................................................................333.2.1温度数据处理算法...............................................................................................333.2.2温度数据处理子程序...........................................................................................353.3DM-1602液晶接口电路...........................................................................................373.4串口通信电路设计...................................................................................................383.4.1MCU与MAX232通信电路设计...........................................................................38目录IV3.4.2串口通信方式.......................................................................................................393.4.3串口通信波特率计算...........................................................................................413.4.4串口通信硬件连接电路.......................................................................................443.5外围电路设计...........................................................................................................453.5.1时钟电路设计........................................................................................