【正文】 ..................1 智能儀表目前發(fā)展狀況 ...................................................................................1第二章 設計任務及可行性分析 ...................................................................................3 系統(tǒng)設計要求 ...................................................................................................3 系統(tǒng)設計思路 ...................................................................................................3 總體結構 ...........................................................................................................3 數(shù)字電流表的組成 ...................................................................................3 電路設計 ...................................................................................................4 10 倍放大器電路 ..........................................................................................4 A/D 轉換電路 ...............................................................................................5 電橋輸入電路 ...........................................................................................6 測量電路 ...................................................................................................6第三章 元器件的選擇 ...................................................................................................8 單片機的選擇 ...................................................................................................8 A/D 轉換器的選擇 ...........................................................................................9 LED 顯示電路的選擇 ......................................................................................9 所需元器件清單 .............................................................................................10第四章 數(shù)字式電流表的軟件設計 .............................................................................11 系統(tǒng)程序設計總方案 .....................................................................................11 系統(tǒng)子程序設計 .............................................................................................11 初始化程序 .............................................................................................11 A/D 轉換子程序 .........................................................................................11 顯示子程序 .............................................................................................12 系統(tǒng)程序代碼 .................................................................................................13第五章 數(shù)字式電流表的調試 .....................................................................................14iii 軟件調試 .........................................................................................................16 顯示結果及誤差分析 .....................................................................................16 顯示結果 .................................................................................................16 誤差分析 .................................................................................................17第六章 結 論 ...............................................................................................................19參考文獻 .........................................................................................................................201第一章 引言 引言傳統(tǒng)的指針式刻度電流表功能單一，精度低，容易引起視差和視覺疲勞，因而不能滿足數(shù)字化時代的需求。數(shù)字電壓表是諸多數(shù)字化儀表的核心與基礎。目前，由各種單片機