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【正文】 日 期: 2021 年 06 月 20 日 2 目 錄 一、 系統(tǒng)設(shè)計(jì) ............................................................................................................... 3 1. 系統(tǒng)方案的比較 ....................................................................................................... 3 ( 1)選題論證 ............................................................................................................ 3 ( 2)方案選擇 ............................................................................................................ 4 2. CPU 的選擇 .............................................................................................................. 4 3. 關(guān)于射頻卡的選擇 ................................................................................................... 4 二、 硬件電路的設(shè)計(jì) ..................................................................................................... 5 1. 基本原理: .............................................................................................................. 5 2. 資源分配: .............................................................................................................. 5 3. 最小系統(tǒng)設(shè)計(jì): ....................................................................................................... 6 4. 各部分電路原理: ................................................................................................... 7 1) 門控鎖電路: .................................................................................................... 7 2) 蜂鳴器電路: .................................................................................................... 8 3) 控制工作指示燈: ............................................................................................ 9 4) 出門按鈕: ..................................................................................................... 10 5) 讀卡模塊: ..................................................................................................... 10 6) 顯示模塊: ..................................................................................................... 13 三、 軟件設(shè)計(jì) ............................................................................................................. 14 1. 流程圖: ................................................................................................................ 15 2. 程序清單: ............................................................................................................ 15 3. 子程序分析: ......................................................................................................... 16 1) 顯示程序: ..................................................................................................... 16 2) 延時(shí)程序: ...................................................................................
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