【正文】 tart button, read through the SCM set of variables and parisons, and then converted to output control signals, control stepper motor and through the display of digital temperature settings and export the water temperature. KEYWORD:DS18B20； Matrix keyboard； 80C51； Step motor； Proteus； C language 目 錄 第一章 前 言 ....................................................................................................................................... 1 ................................................................................................................ 1 統(tǒng)式機械混水閥 ....................................................................................................................... 1 ............................................................................................ 1 ............................................................................................ 2 ...................................................................................................................... 2 ................................................................ 2 研究內(nèi)容 ........................................................................................................................... 3 第二章 系統(tǒng)方案的選擇及論證 ............................................................................................................. 4 系統(tǒng)的功能要求 .......................................................................................................................... 4 各模塊方案選擇及論證 ............................................................................................................... 4 ............................................................................................................................... 4 .................................................................................................................... 4 .................................................................................................................... 5 .................................................................................................................... 5 ........................................................................................................................... 5 系統(tǒng)的硬件框圖 ................................................................................................................ 6 第三章 硬件電路的設(shè)計與實現(xiàn) ........................................................................................................... 7 ........................................................................................................................................ 7 80C51簡介 ........................................................................................................................ 7 80C51內(nèi)部結(jié)構(gòu) ................................................................................................................. 9 .............................................................................................................................11 ..................................................................................................11 ................................................................................................................11 鍵盤的工作方式 ...............................................................................................................12 .............................................................................................................................13 LED顯示原理 ...................................................................................................................13 串行顯示電路和 74LS164簡介 ..........................................................................................14 .............................................................................................................................15 .............................................................................................................................16 ...................................................................................................................16 ..................................................................................................17 步進電機在控制上的特點 .................................................................................................17 ..................................................................................................18 L297和 L298簡介 ............................................................................................................18 L297和 L298構(gòu)成的驅(qū)動電路 ...........................................................................................20 第四章 系統(tǒng)軟件設(shè)計與仿真 ...............................................................................................................21 軟件開發(fā)與仿真調(diào)試環(huán)境和開發(fā)語言介紹 ..................................................................................21 ......................................................................................................................21 子程序描述及其流程圖 ..............................................................................................................22 溫度讀取子程序 ...............................................................................................................23 鍵盤掃描子程序 ...............................................................................................................23 步進電機升降溫控制子程序 ..............................................................................................24 系統(tǒng)總體仿真圖 ...............................................................................................................25 總 結(jié) ..................................................................................................................................................26 致 謝 ..............................