【正文】 .....................................................................................................................................1第 1章 緒論 .............................................................................................................................................................3 課題背景，目的和意義 ...................................................................................................................................3 ........................................................................................................................3 ....................................................................................................................................................4第 2章 超聲波測距原理概述 .................................................................................................................................5 ....................................................................................................................................................6 超聲波發(fā)生器 ...........................................................................................................................................6 壓電式超聲波發(fā)生器原理 .......................................................................................................................6....................................................................................................................7第 3章 設(shè)計方案 .....................................................................................................................................................8 AT89S51單片機 ................................................................................................................................................8 超聲波測距系統(tǒng)構(gòu)成 .....................................................................................................................................11 超聲波測距單片機系統(tǒng) .............................................................................................................................12 超聲波發(fā)射、接收電路 .............................................................................................................................12 ......................................................................................................................................................14 供電電路 .....................................................................................................................................................14 ..............................................................................................................................................15第 4章 系統(tǒng)軟件設(shè)計 ...........................................................................................................................................16 主程序設(shè)計 .....................................................................................................................................................16 超聲波測距程序流程圖 .................................................................................................................................20 超聲波測距程子序流程圖 .............................................................................................................................21第 5章 調(diào)試及性能分析 .......................................................................................................................................21 ..........................................................................................................................................................21 性能分析 .........................................................................................................................................................22參考文獻 .................................................................................................................................................................22附錄一：基于 AT89S51單片機超聲波測距系統(tǒng)電原理圖 .................................................................................24附錄二 基于 AT89S51單片機超聲波測距系統(tǒng) PCB圖 .......................................................................................25附錄三 基于 AT89S51單片機超聲波測距系統(tǒng)焊接組裝圖 ...............................................................................26附錄四 基于 AT89S51單片機超聲波測距系統(tǒng) C語言原程序 ...........................................................................27附錄五 元件清單 ...................................................................................................................................................413第 1章 緒論 課題背景，目的和意義傳感器技術(shù)是現(xiàn)代信息技術(shù)的主要內(nèi)容之一。 Onechip puter。s practical demand in measuring the pre