【正文】 摘 要智能家居安防系統(tǒng)是利用計算機技術(shù)、微電子技術(shù)、通信技術(shù)，通過家庭智能終端及其系統(tǒng)軟件將家庭智能化的所有功能集成起來實現(xiàn)居家安全防范。家居安防包括防盜、防燃氣泄漏、防火等功能，并具備遠程監(jiān)控，住戶可以通過網(wǎng)絡或電話隨時了解家內(nèi)情況。本文基于智能家居安防對室內(nèi)煤氣含量的檢測技術(shù)及可燃氣體傳感器做了概括的介紹，系統(tǒng)中單片機系統(tǒng)主要完成信號采集、數(shù)據(jù)通信，微機完成數(shù)據(jù)接收、存入數(shù)據(jù)庫、數(shù)據(jù)處理、顯示及開啟和關閉家用電器等功能。詳細討論了以單片機 AT89S52 為控制核心、MQ306A 集成可燃氣體傳感器、采用 RS232 接口通信、ADC0809 模數(shù)轉(zhuǎn)換進行數(shù)據(jù)傳輸?shù)闹悄芗揖影卜老到y(tǒng)初步構(gòu)建的設計方案。下位機軟件設計中采用匯編語言編寫數(shù)據(jù)采集程序和對 RS232 接口芯片進行協(xié)議處理及數(shù)據(jù)交換的程序。后臺處理軟件的數(shù)據(jù)處理程序應用 VC 語言編寫，給出了控制軟件流程及源程序代碼。本次畢業(yè)設計達到了預定的目標，實現(xiàn)了對室內(nèi)可燃氣體含量的采集與實時顯示，并可以根據(jù)預警值自動開啟排風扇。針對在系統(tǒng)調(diào)試過程中出現(xiàn)的問題提出了解決方案及方法。關鍵字：可燃氣體傳感器；RS232；數(shù)據(jù)采集；89S52AbstractSmart Home Security System use the Computer technology, microelectronic technology, munications technology and integrating all the features of the intelligent terminal by the family and its system software to achieve home security. The functions of home security system include Antitheft antigas leak and fire. It has remote monitoring function, tenants can through the Inter or by telephone at any time to understand the situation within the family.This article makes the broad introduction about An Fang based on the intelligence to the indoor coal gas content examination technology and the flammable gas sensor, in the system the monolithic integrated circuit system has mainly pleted signal gathering, the data munication, the microputer database pletes the data receive, data processing, demonstration and opening and closure domestic electric appliances functions and so on. This paper discussed in detail the preliminary design plan about that take monolithic integrated circuit AT89S52 as the control core, MQ306A integrates the flammable gas sensor, use the RS232 connection correspondence, and the ADC0809 a/d conversion to carry on the data transmission to implement intelligent home security the lower position machine software design uses the assembly language pilation data acquisition procedure and carries on the protocol processing and the data exchange procedure to the RS232 connection chip. The superior machine data reduction program applies the VC language pilation, and gives control processes and software source codeThe graduation project has achieved the predetermined goal,.It has realized to indoor flammable gas content gathering and the real time displaying, and can open the ventilating fan automatically according to the early warning value. In view of the question which appears in the system debugging process ,we have proposed solutions and methods.Key words：pulse signal。 data sample。 RS232。 89S52目 錄摘要Abstract第一章 緒論 .........................................................................................................................................................1 概述 .................................................................................................................................................................1 論文目的和意義及創(chuàng)新點 .......................................................................................................................1 智能家居安防系統(tǒng)初步構(gòu)建的意義及本課題主要的研究內(nèi)容 ...............................................2 基于無線傳感器網(wǎng)絡的智能家居安防系統(tǒng)初步構(gòu)建的意義 .................................................2 本課題主要的研究內(nèi)容 ........................................................................................................................2 國內(nèi)外研究現(xiàn)狀 ..........................................................................................................................................3 小結(jié) ..................................................................................................................................................................4第二章 智能家居安防系統(tǒng)整體方案設計 ...............................................................................................5 智能家居安防系統(tǒng)的系統(tǒng)結(jié)構(gòu) .............................................................................................................5 系統(tǒng)設計方案 ...............................................................................................................................................6 系統(tǒng)性能指標 ...........................................................................................................................................6 系統(tǒng)設計原理 ...........................................................................................................................................6 后臺處理軟件部分所實現(xiàn)的功能 .........................................................................................................7 下位機部分所實現(xiàn)的功能 .......................................................................................................................8 小結(jié) ..................................................................................................................................................................9第三章 智能家居安防系統(tǒng)硬件電路設計 .............................................................................................10 可燃氣體傳感器電路模塊 .....................................................................................................................10 MQ306A 氣體傳感器概述 ................................................................................................................10 MQ306A 測試電路 ..............................................................................................................................10 數(shù)據(jù)采集 A/D 轉(zhuǎn)換模塊 ........................................................................................................................12 ADC0809 模數(shù)轉(zhuǎn)換芯片概述 ..........................................................................................................12 ADC0809 與 AT89S52 接口電路 ...................................................................................................12 無線收發(fā)模塊 ............................................................................................................................................13 PTR8000 無線收發(fā)原理 .....................................................................................................................13 PTR8000 無線收發(fā)數(shù)傳模塊的特點及應用 ............