【正文】 ......................................................................... 10 系統(tǒng)主控電路的設(shè)計 ...................................................................................... 10 單片機芯片 AT89S51 介紹 ........................................................................ 10 單片機引腳說明 ........................................................................................ 11 的最小系統(tǒng)電路構(gòu)成 ................................................................. 13 數(shù)據(jù)處理部分電路設(shè)計 .................................................................................. 13 傳感器和外圍放大電路設(shè)計 ................................................................... 13 顯示電路設(shè)計 .................................................................................................. 15 鍵盤電路設(shè)計 .................................................................................................. 16 硬件抗干擾措施 ................................................................ 錯誤 !未定義書簽。 現(xiàn)狀及其發(fā)展動態(tài) ............................................................................................ 1 2 系統(tǒng)方案的設(shè)計 ...................................................................................................... 2 稱重器的工作原理 ............................................................................................ 2 電子稱重器的設(shè)計思路 .................................................................................... 2 系統(tǒng)總體設(shè)計方案論證與選擇 ........................................................................ 3 各模塊功能的方案論證與選擇 ........................................................................ 3 稱重傳感器模塊 ......................................................... 錯誤 !未定義書簽。 LED digital tube I 目 錄 1 緒論 .......................................................................................... 錯誤 !未定義書簽。 AT89S51。 their technical performance trend rate is high, high accuracy, stability High, high reliability, its function is weighing measures tend to control information and noncontrol information both the intelligent functions of its application performance tend to be prehensive and binations of. This article is based on AT89S51 of an electronic weighing equipment design. It firstly briefly discusses the main background and electronic overall design,And then expounds the digital electronic design process, and the hardware and software design of the system is given, and the hardware circuit design details. This type of digital electronic weigher is keen, correct and convenient to use. Its humanputer interface has a good interactive function and it can be used in vary circumstances, such as family and shopping mall, etc. Key words: an electronic scale。 關(guān)鍵字：電子秤 ； 稱重傳感器 ； AT89S51 單片機 ； A/D 轉(zhuǎn)換器 ； LED 數(shù)碼管 II Abstract Weighing technology from time immemorial attention, as a measurement method, widely used in industry, scientific research, transportation, and trade fields, and people39。單片機為主要部件，完成數(shù)據(jù)處理和對各個部分的控制，通過對電路輸出電壓和標準重量的線性關(guān)系，建立具體的數(shù)學模型，將電壓量綱（ V）改為重量綱（ g）。論文首先簡要敘述了電子秤的主要背景以及總體的設(shè)計方式；然后詳細闡述了數(shù)字電子秤的設(shè)計流程，以及硬件系統(tǒng)和軟件系統(tǒng)的設(shè)計，并給出了硬件電路的設(shè)計細節(jié)。 通過分析近年來電子衡器產(chǎn)品的發(fā)展情況及國內(nèi)外市場的需求，電子衡器總的發(fā)展趨勢是 小型化、模塊化、集成化、智能化；其技術(shù)性能趨向是速率高、準確度高、 穩(wěn)定性高、可靠性高；其功能趨向是稱重計量的控制信息和非控制信息并重的 “ 智能化 ” 功能；其應(yīng)用性能趨向于綜合性和組合性。 電子秤是電子衡器中的一種，衡器是國家法定計量器具，是國計民生、國防建設(shè)、科學研究、內(nèi)外貿(mào)易不可缺少的計量設(shè)備，衡器產(chǎn)品技術(shù)水平的高低，將直接影響各行各業(yè)的現(xiàn)代化水平和社會經(jīng)濟效益的提高。I 摘要 稱重技術(shù)自古以來就被人們所重視，作為一種計量手段，廣泛應(yīng)用于工農(nóng)業(yè)、科研、交通、內(nèi)外貿(mào)易等各個領(lǐng)域，與人民的生活緊密相連。 目前，商用電子秤的使用非常普及，逐漸會取代傳統(tǒng)的桿秤和機械案秤。因此，稱重技術(shù)的研究和衡器工業(yè)的發(fā)展各國都非常重視。 本文是基于 AT89S51 單片機的一種電子稱重設(shè)備的設(shè)計說明。本系統(tǒng) 主要 分為四大部分，信號前級為稱重傳感器和放大濾波電路，電阻應(yīng)變式稱重傳感器，利用全橋測量原理，將重力信號轉(zhuǎn)換成電 信號來測量。人機界面部分由六位 LED 管顯示與 44 位矩陣鍵盤組成，可以由鍵盤控制顯示重量和價錢等信息。s lives are closely linked. At present, the use of electronic mercial very popular, and gradually will replace the traditional GanCheng and machinery. Electronic is a kind of electron weighing apparatus, instruments is the national legal measuring instruments, livelihood, national defense, science research, domestic and foreign trade indispensable measure equipment, instruments, product technical level will directly influence the from all walks of life and social modernization level economic benefit. Therefore,weighing technology research and development of all industrial instruments very seriously. Weighing in recent years through analysis of electronic products and the development of domestic and international market demand, electronic weighing the overall development trend is small and modular, integrated, intelligent。 Weighing transducer。 A/D converter。 電子稱重器背景介紹 ........................................................ 錯誤 !未定義書簽。 前置信號處理模塊 ...................................................................................... 4 A/D 轉(zhuǎn)換器 .................................................................................................. 7 鍵盤及顯示模塊 ......................................................... 錯誤 !未定義書簽。 本章小結(jié) .......................................................................................................... 18 4 系統(tǒng)軟件設(shè)計 ........................................................................................................ 18 II 主程序