【正文】 14 AT89C52 芯片 15 芯片的介紹 15 主要功能介紹 16 AD 轉(zhuǎn)換芯片選擇 19 ADC0809 的主要特性 20 ADC0809 引腳圖 21 LCD 液晶顯示電路 23 LCD 顯示電路 23 哈爾濱理工大學(xué)成人教育學(xué)院畢業(yè)論文 IV LCD 管腳介紹 24 電源模塊的設(shè)計 25 聲光報警電路 25 蜂鳴器報警 25 燈光報警電路 26 SPI 總線 27 SPI 總線特點 27 SPI 電路 27 第 4 章 硬件系統(tǒng)單元模塊調(diào)試 28 調(diào)試結(jié)構(gòu)圖及系統(tǒng)流程圖 28 本設(shè)計試驗條件 30 硬件調(diào)試 30 電源電路模塊的檢測與調(diào)試 30 甲烷檢測儀 CPU 的調(diào)試 30 A/D 轉(zhuǎn)換、顯示電路的調(diào)試 31 聲光報警電路的檢測與調(diào)試 31 結(jié) 論 32 致 謝 33 參考文獻 34 哈爾濱理工大學(xué)成人教育學(xué)院畢業(yè)論文 V Contents CHAPTERI INTRODUCTION ..................................................................... 1 RESEARCH BACKGROUND AND SIGNIFICANCE ........................................... 1 DOMESTIC AND FOREIGN RESEARCH PRESENT SITUATION AND DEVELOPMENT DIRECTION ...................................................................................... 1 SUBJECT OF THE MAIN RESEARCH CONTENTS AND REQUIREMENTS .......... 4 SYSTEM INTRODUCTION ............................................................................. 4 CHAPTERII THE SCHEME DESIGN OF GAS ALARM SYSTEM ....... 5 REASON OF GAS EXPLOSION AND FACTORS ................................................ 5 THE MONITORING OF THE FIRE DAMP EXPLOSION ...................................... 6 MINE GAS DETECTION SYSTEM SPECIFICATIONS AND FUNCTIONALITY ..... 7 Coal mine gas detection technology system overview .................... 7 Design principle of the system.......................................................... 7 Technical index requirements............................................................ 8 System implementation of the function.......................................... 10 SYSTEM DESIGN SCHEME.......................................................................... 10 CHAPTERIII GAS ALARM SYSTEM HARDWARE CHOICE .............11 MQ7SMOKE SENSOR................................................................................11 concentration detection instrument according to its working principle ..............................................................................................11 MQ5 Combustible gas detection with characteristics .................. 14 AT89C52 CHIP ......................................................................................... 15 Chip introduction ............................................................................. 15 The main function introduction....................................................... 16 THE AD CONVERSION CHIP SELECT.......................................................... 19 哈爾濱理工大學(xué)成人教育學(xué)院畢業(yè)論文 VI ADC0809 Main features .................................................................. 20 ADC0809 Pin figure ........................................................................ 21 LCD LIQUID CRYSTAL DISPLAY CIRCUIT .................................................. 23 The LCD display circuit .................................................................. 23 LCD pin introduction....................................................................... 24 POWER SUPPLY MODULE DESIGN .............................................................. 25 SOUND AND LIGHT ALARM CIRCUIT ......................................................... 25 The buzzer alarm.............................................................................. 25 The light alarm circuit ..................................................................... 26 SPI BUS..................................................................................................... 27 SPI bus characteristics ..................................................................... 27 SPI circuit ......................................................................................... 27 CHAPTERIV DEBUGGING OF HARDWARE SYSTEM UNIT MODULE ................................................................................................................ 28 DEBUG THE STRUCTURE DIAGRAM AND SYSTEM FLOWCHART ................ 28 THIS DESIGN TEST CONDITIONS ................................................................ 30 HARDWARE DEBUGGING........................................................................... 30 Testing and missioning of the power supply circuit module ...... 30 Methane detector CPU debugging .................................................. 30 A/D conversion and display circuit debugging .............................. 31 Sound and light alarm circuit testing and debugging .................... 31 CONCLUSION ................................................