【正文】 o use the most general one at present ,it applies to guard against theft , move backward the radar , water level measuring , building construction site and some industrial scenes extensively。s practical demand in measuring the precision 。 Onechip puter。 AT89S512目 錄ABSTRACT...................................................................................................................................................................1第 1 章 緒論 .............................................................................................................................................................3 課題背景，目的和意義 ...................................................................................................................................3 基于單片機(jī)的超聲波測距系統(tǒng) ........................................................................................................................3 課題主要內(nèi)容 ....................................................................................................................................................4第 2 章 超聲波測距原理概述 .................................................................................................................................5 超聲波傳感器 ....................................................................................................................................................6 超聲波發(fā)生器 ...........................................................................................................................................6 壓電式超聲波發(fā)生器原理 .......................................................................................................................6 單片機(jī)超聲波測距系統(tǒng)構(gòu)成....................................................................................................................7第 3 章 設(shè)計方案 .....................................................................................................................................................8 AT89S51 單片機(jī) ................................................................................................................................................8 超聲波測距系統(tǒng)構(gòu)成 .....................................................................................................................................11 超聲波測距單片機(jī)系統(tǒng) .............................................................................................................................12 超聲波發(fā)射、接收電路 .............................................................................................................................12 顯示電路 ......................................................................................................................................................14 供電電路 .....................................................................................................................................................14 報警輸出電路 ..............................................................................................................................................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 調(diào)試步驟 ..........................................................................................................................................................21 性能分析 .........................................................................................................................................................22參考文獻(xiàn) .................................................................................................................................................................22附錄一：基于 AT89S51 單片機(jī)超聲波測距系統(tǒng)電原理圖 .................................................................................24附錄二 基于 AT89S51 單片機(jī)超聲波測距系統(tǒng) PCB 圖 .......................................................................................25附錄三 基于 AT89S51 單片機(jī)超聲波測距系統(tǒng)焊接組裝圖 ...............................................................................26附錄四 基于 AT89S51 單片機(jī)超聲波測距系統(tǒng) C 語言原程序 ...........................................................................