【正文】
目 錄摘要一、設(shè)計任務(wù)與要求 二、方案設(shè)計與論證 三、電子元器件的選取(A/D)芯片的選取四、各硬件模塊的具體實現(xiàn)方案 電源原理 電源電路圖 4.2. 1電阻應(yīng)變式稱重傳感器原理 、差動放大電路 、A/D轉(zhuǎn)換 A/D轉(zhuǎn)換器的選擇 TLC2543主要性能參數(shù) TLC2543封裝形式及各管腳功能 實際硬件電路連接圖五、系統(tǒng)軟件設(shè)計六、系統(tǒng)調(diào)試 6.1調(diào)試過程 七、系統(tǒng)功能八、實際總結(jié)九、參考文獻十、附錄摘 要本文描述了基于AT89s52單片機設(shè)計的電子秤原理及實現(xiàn)方法。該系統(tǒng)由51單片機的改良版52單片機控制,通過液晶屏自動顯示所稱物體的重量。其電路構(gòu)成主要有測量電路,差動放大電路,A/D轉(zhuǎn)換,單片機控制電路、顯示電路。測量電路利用電阻式應(yīng)變器件將物體的重量信號轉(zhuǎn)化成相應(yīng)大小的電信號,通過差動放大電路將電信號放大到AD芯片能夠識別的范圍內(nèi)從而能將電信號轉(zhuǎn)換成對應(yīng)的數(shù)字信號送給單片機處理,最終在液晶上顯示所稱物體的重量,系統(tǒng)通過軟件實現(xiàn)自動換擋。經(jīng)調(diào)試和測試,系統(tǒng)各項性能參數(shù)基本達到設(shè)計指標(biāo)。 關(guān)鍵詞:稱重傳感器、差分放大器、模數(shù)(AD)轉(zhuǎn)換器、AT89S52單片機、1602液晶、 自動換擋。AbstractThis article describes the design of AT89s52 microcontroller based electronic scale theory and implementation methods. The system consists of 51 singlechip microprocessor control improved version 52, the LCD displays that object automatically. Its ponents are measuring circuit, differential amplifiers, A/d conversion, the microputer 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 amplificati