【正文】 .................................................................12 設(shè)計思路 ......................................................................................................................................................3 設(shè)計要求 .........................................................................................................................................3 設(shè)計方案的確定 .........................................................................................................................3 電子秤的主要組成 ...................................................................................................................5 電子秤的基本結(jié)構(gòu) ...............................................................................................................5 電子秤的工作原理 ...............................................................................................................6 電子秤的參數(shù)指標(biāo) ...............................................................................................................63 元件選擇及硬件電路的設(shè)計 ...........................................................................................................8 元件選擇 .........................................................................................................................................8 單片機(jī)的選擇 ........................................................................................................................8 傳感器的選擇 ........................................................................................................................9 A/D 轉(zhuǎn)換器的選擇 ..............................................................................................................10 顯示器的選擇 ......................................................................................................................11 硬件電路的設(shè)計 .......................................................................................................................12 電源電路 ...............................................................................................................................12 主控電路 ...............................................................................................................................13 顯示電路 ...............................................................................................................................15 超重報警電路 ......................................................................................................................16 按鍵輸入電路 ......................................................................................................................16 HX711 轉(zhuǎn)換電路 ..................................................................................................................18 硬件電路圖與 PCB 板線路的繪制 .................................................................................19 Protel99SE 軟件 ................................................................................................................19 原理圖與 PCB 板線路的繪制 ..........................................................................................194 軟件設(shè)計 ....................................................................................................................................................21 軟件編譯環(huán)境 ............................................................................................................................21 主程序流程圖 ............................................................................................................................21 按鍵模塊流程圖 .......................................................................................................................22 顯示模塊流程圖 .......................................................................................................................235 實物的焊接與調(diào)試 ...............................................................................................................................24 實物的焊接 .................................................................................................................................24 PCB 板制作............................................................................................................................24 實物焊接 ...............................................................................................................................25 實物的調(diào)試 .................................................................................................................................26 實物效果圖 .................................................................................................................................276 結(jié)束語 .........................................................................................................................................................28致謝 .......................................................................................................................................................................29參考文獻(xiàn) ............................................................................................................................................................30附錄 .......................................................................................................................................................................31附錄 I 原理圖 .....................................................................................................................................31附錄 II 主程序 ...................................................................................................................................32數(shù)字電子秤的設(shè)計與實現(xiàn)摘 要 單片機(jī)作為計算機(jī)發(fā)展的重要分支，信息處理速度不僅快而且處理能力特別強，是現(xiàn)代絕大多數(shù)電子產(chǎn)品最重要的核心部分。數(shù)顯電子秤的設(shè)計是通過壓力傳感器采集到被測物體的確切重量并將其轉(zhuǎn)換成相應(yīng)的電壓信號。 （5）綜合性 電子稱重技術(shù)的發(fā)展規(guī)律就是不斷的加強基礎(chǔ)研究并擴(kuò)大相應(yīng)的應(yīng)用，擴(kuò)展新的技術(shù)領(lǐng)域，向相鄰學(xué)科和行業(yè)滲透，綜合各種技術(shù)去解決稱重計量、信息處理等問題。方案一 數(shù)碼管顯示。最終采用方案三來作為本次設(shè)計與制作的思路。 電子秤的工作原理 當(dāng)被稱物體放置在秤體的秤臺上時，其重量便通過秤體傳遞到稱重傳感器，傳感器隨之產(chǎn)生力一電效應(yīng)，將物體的重量轉(zhuǎn)換成與被稱物體重量成一定函數(shù)關(guān)系（一般成正比關(guān)系）的電信號（電壓或電流等） 。圖 31 AT89