【正文】 數(shù)字電子秤的設(shè)計與實(shí)現(xiàn)畢業(yè)設(shè)計目 錄摘要 .........................................................................................................................................................................IABSTRACT.............................................................................................................................................................II1 緒論 .................................................................................................................................................................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(shí)物的焊接與調(diào)試 ...............................................................................................................................24 實(shí)物的焊接 .................................................................................................................................24 PCB 板制作............................................................................................................................24 實(shí)物焊接 ...............................................................................................................................25 實(shí)物的調(diào)試 .................................................................................................................................26 實(shí)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 ...................................................