摘要本设计主要由温湿度检测、烟雾检测电路、报警电路、显示电路和人体检测等模块组成。温湿度检测部分使用的是DHT11这种型号的温湿度传感器。DHT11是一种单总线型数字式温湿度传感器，它具有误差小、分辨率高、抗干扰能力强等特点。在烟雾检测电路模块当中，利用气体传感器MQ-2与ADC0832模数转换器实现基本功能。通过这些传感器和芯片，当环境中可燃气体浓度或有毒气体等发生变化时系统会发出相应的灯光报警信号和声音报警信号，以此来实现火灾报警，智能化提示。人体检测部分，是通过HC-SR501模块实现，其主要工作原理就是将感应到的红外热辐射信号转换成电信号，再将其放大输出。如果检测到危险信号，就会将信号传送给单片机，再经单片机处理，然后控制蜂鸣器和LED点亮发出警告。本设计还可以在各种防盗场合下得到应用，比如家居防盗、仓库防盗等。温湿度、烟雾和人体防盗检测是三种最基本的环境参数，其测量方法和装置对现在的生活、生产具有重要的意义。关键词：温湿度检测;MQ-2传感器;烟雾报警;热释电红外传感器;防盗报警器ABSTRACT1hedesignismainlycomposedoftemperatureandhumiditydetection,smokedetectioncircuit,alarmcircuit,displaycircuitandhumandetectionmodule.ThetemperatureandhumiditytestsectionusestheDHT11temperatureandhumiditysensor.DHT11isasinglebusdigitaltemperatureandhumiditysensor.Ithastheadvantagesofsmallerror,highresolution,stronganti-interferenceabilityandsoon.Inthesmokedetectioncircuitmodule,thegassensorMQ-2andtheADC0832analogtodigitalconverterareusedtorealizethebasicfunctions.Throughthesesensorsandchips,whenthecombustiblegasconcentrationintheenvironmentortoxicgaschangesthesystemsendsoutthecorrespondinglightalarmsignalandsoundalarmsignal,inordertorealizetheintelligentfirealarmprompt.ThehumandetectionpartisrealizedbytheHC-SR501module.Themainprincipleistoconverttheinfraredradiationsignalsintoelectricalsignals,thenamplifyandoutputthem.Ifadangeroussignalisdetected,thesignalistransmittedtothemicrocontroller,processedbyamicrocontroller,andthencontrolledbyabuzzerandLEDtolightawarning.Thedesigncanalsobeappliedinavarietyofanti-theftoccasions,suchashomesecurity,warehouseanti-theft,etc..Temperature,humidity,smokeandhumanburglardetectionarethethreebasicenvironmentalparameters,andtheirmeasurementmethodsanddevicesareimportanttothepresentlifeandproduction.Keywords：Temperatureandhumiditydetection;MQ-2sensor;Smokealarm;Pyroelectricinfraredsensor;Burglaralarm2目录1绪论...........................................................................................................................................................51.1课题背景............................................................................................................................................51.2概述及功能介绍............................................................................................................................51.2.1功能概述.......................................................................................................................................51.2.2主要功能介绍…………………………………………………………………………………..61.3本课题的研究思路.......................................................................................................................61.3.1研究意义.......................................................................................................................................61.3.2研究思路.........................................................................................................................
