【正文】 數(shù)字電子秤的設計與實現(xiàn)數(shù)字電子秤的設計與實現(xiàn)畢業(yè)論文目 錄摘要 .........................................................................................................................................................................IABSTRACT.............................................................................................................................................................II1 緒論 .................................................................................................................................................................12 設計思路 ......................................................................................................................................................3 設計要求 .........................................................................................................................................3 設計方案的確定 .........................................................................................................................3 電子秤的主要組成 ...................................................................................................................5 電子秤的基本結構 ...............................................................................................................5 電子秤的工作原理 ...............................................................................................................6 電子秤的參數(shù)指標 ...............................................................................................................63 元件選擇及硬件電路的設計 ...........................................................................................................8 元件選擇 .........................................................................................................................................8 單片機的選擇 ........................................................................................................................8 傳感器的選擇 ........................................................................................................................9 A/D 轉換器的選擇 ..............................................................................................................10 顯示器的選擇 ......................................................................................................................11 硬件電路的設計 .......................................................................................................................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數(shù)字電子秤的設計與實現(xiàn) HX711 轉換電路 ..................................................................................................................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 實物的焊接與調試 ...............................................................................................................................24 實物的焊接 .................................................................................................................................24 PCB 板制作............................................................................................................................24 實物焊接 ...............................................................................................................................25 實物的調試 .................................................................................................................................26 實物效果圖 .................................................................................................................................276 結束語 .........................................................................................................................................................28致謝 .......................................................................................................................................................................29參考文獻 ............................................................................................................................................................30附錄 .......................................................................................................................................................................31附錄 I 原理圖 .......................................................................................