摘要 本文描述了基于AT89s52單片機(jī)設(shè)計(jì)的電子秤原理及實(shí)現(xiàn)方法。該系統(tǒng)由51單片機(jī)的改良版52單片機(jī)控制，通過(guò)液晶屏自動(dòng)顯示所稱物體的重量。其電路構(gòu)成主要有測(cè)量電路，差動(dòng)放大電路，A/D轉(zhuǎn)換，單片機(jī)控制電路、顯示電路。測(cè)量電路利用電阻式應(yīng)變器件將物體的重量信號(hào)轉(zhuǎn)化成相應(yīng)大小的電信號(hào)，通過(guò)差動(dòng)放大電路將電信號(hào)放大到AD芯片能夠識(shí)別的范圍內(nèi)從而能將電信號(hào)轉(zhuǎn)換成對(duì)應(yīng)的數(shù)字信號(hào)送給單片機(jī)處理，最終在液晶上顯示所稱物體的重量，系統(tǒng)通過(guò)軟件實(shí)現(xiàn)自動(dòng)換擋。發(fā)揮部分的顯示購(gòu)物清單的功能，可以設(shè)置日期和設(shè)定十種商品的單價(jià)， 還具有超量程和欠量程的報(bào)警功能。整個(gè)系統(tǒng)結(jié)構(gòu)簡(jiǎn)單，使用方便，功能齊全，精度高，具有一定的開(kāi)發(fā)價(jià)值。
關(guān)鍵詞：稱重傳感器 差分放大器 模數(shù) 轉(zhuǎn)換器、













Based on 51 electronic says
Abstract This article describes the design of AT89s52 microcontroller based electronic scale theory and implementation methods. The system consists of 51 single-chip microprocessor control improved version 52, the LCD displays that object automatically. Its components are measuring circuit, differential amplifiers, A/d conversion, the microcomputer control circuit, show circuit. The measuring circuit using resistance strain the weight of the device object into the appropriate signals to the size of the electrical signals through the differential amplifier will signal amplification to AD chip can identify scope so that they could be an electrical signal into a digital signal corresponding to the handle to the SCM in the LCD display that the weight of the object, the system automatically by software implementation. Through debugging, and testing, system performance parameters basic design index.
Keywords Weighing sensors cell differential amplifier








目 錄

引 言 1
第一章 設(shè)計(jì)任務(wù)要求與方案設(shè)計(jì)論證 2
第二章、電子元器件的選取與各硬件模塊的具體實(shí)現(xiàn)方案 5
第三章、系統(tǒng)軟件設(shè)計(jì) 10
第四章、系統(tǒng)調(diào)試 13
結(jié)論 16
參考文獻(xiàn) 17
致謝 18
附錄：原器件清單 19