【正文】 示單元，此電子秤俱備了功能多、性能價(jià)格比高、功耗低、系統(tǒng)設(shè)計(jì)簡單、使用方便直觀、速度快、測量準(zhǔn)確、自動(dòng)化程度高等特點(diǎn)。為了改變傳統(tǒng)稱重工具在使用上存在的問題，在本設(shè)計(jì)中將智能化、自動(dòng)化、人性化用在了電子秤重的控制系統(tǒng)中。關(guān)鍵詞 AT89C51 稱重傳感器 A/D 轉(zhuǎn)換器 LCD 顯示器 IIIAbstractWith the application of microelectronics technology, tradition ponderation instrument used in market has been not satisfaction with hunman requirements already. In order to make up for the traditional apparatus shorting, we improve the apparatus39。 LCD Monitor IV I目 錄摘 要 ...........................................................................................................................................................................IABSTRACT.......................................................................................................................................................................II第一章 緒論 ............................................................................................................................................................1 電子秤的概述 ................................................................................................................................................1 設(shè)計(jì)目的 .........................................................................................................................................................2第二章 系統(tǒng)方案的設(shè)計(jì) ................................................................................................................................1 設(shè)計(jì)要求 .........................................................................................................................................................1 進(jìn)度安排 .........................................................................................................................................................1 電子秤的工作原理 ......................................................................................................................................1 系統(tǒng)的整體設(shè)計(jì)思路 .................................................................................................................................2第三章 系統(tǒng)硬件電路設(shè)計(jì) ..............................................................................................................................5 壓力傳感器 .....................................................................................................................................................5 前級(jí)放大器 .....................................................................................................................................................8 反相比例運(yùn)算電路 .............................................................................................................................8 前級(jí)放大電路 ....................................................................................................................................10 A/D 轉(zhuǎn)換器 ....................................................................................................................................................11 方案比較 ..............................................................................................................................................11 ADC0832 芯片介紹 ............................................................................................................................12 采樣電路圖 .........................................................................................................................................12 控制器 ............................................................................................................................................................13 AT89C51 芯片介紹 ............................................................................................................................14 單片機(jī)最小系統(tǒng) ...............................................................................................................................16 輸入鍵盤 ........................................................................................................................................................17 矩陣鍵盤仿真及接線圖 .................................................................................................................18 矩陣鍵盤工作原理 ...........................................................................................................................18 輸出顯示 .......................................................................................................................................................18 II LCD12864 介紹 ...................................................................................................................................19 LCD 顯示電路圖 .................................................................................................................................21 LCD 的驅(qū)動(dòng) ..........................................................................................................................................21第四章 系統(tǒng)軟件的設(shè)計(jì) .................................................................................................................................22 主程序設(shè)計(jì) ...................................................................................................................................................22 A/D 轉(zhuǎn)換啟動(dòng)及數(shù)據(jù)讀取程序設(shè)計(jì) ....................................................................................................23 鍵盤子程序 ...................................................................................................................................................24 顯示子程序 ...................................................................................................................................................25第五章 仿真調(diào)試 ..................................................................................................................................................26 PROTEUS軟件介紹 .........................................................................................................................................26 仿真步驟 ......................................