Multisim仿真8路搶答器設計資料,帶完整ms文件與設計論文等

一、 設計任務
1. 搶答器同時供 8 名選手或 8 個代表隊比賽，分別用 8 個按鈕 S0 ~ S7 表示。
2. 設置一個系統清除和搶答控制開關 S，該開關由主持人控制。
3. 搶答器具有鎖存與顯示功能。即選手按動按鈕，鎖存相應的編號，并在 LED 數碼管上顯示，同時揚聲器發出報警聲響提示。選手搶答實行優先鎖存，優先搶答選手的編號一直保持到主持人將系統清除為止。
4. 搶答器具有定時搶答功能，且一次搶答的時間由主持人設定（如 30 秒）。當主持人啟動"開始"鍵后，定時器進行減計時，同時揚聲器發出短暫的聲響，聲響持續的時間 0.5 秒左右。
5. 參賽選手在設定的時間內進行搶答，搶答有效，定時器停止工作，顯示器上顯示選手的編號和搶答的時間，并保持到主持人將系統清除為止。
6. 如果定時時間已到，無人搶答，本次搶答無效，系統報警并禁止搶答，定時顯示器上顯示 00。
二、設計方案
1.設計分析
搶答器具有鎖存、定時、顯示和報警功能。即當搶答開始后，選手搶答按動按鈕，鎖存器鎖存相應的選手編碼，同時用 LED 數碼管把選手的編碼顯示出來，并且開始搶答時間的倒計時，同時用 LED 數碼管把選手的所剩搶答時間顯示出來。而在選手按鍵搶答以及搶答時間倒計時到時的時候都有報警以提醒主持人和選手。搶答時間設定 30 秒。接通電源后，主持人將開關撥到“清除”狀態，搶答器處于禁止狀態，編號顯示器滅燈，定時器顯示設定時間；主持人將開關置“開始”狀態，宣布“開始”搶答器工作。定時器倒計時。選手在定時時間內搶答時，搶答器完成：優先判斷、編號鎖存、編號顯示、揚聲器提示。當一輪搶答之后，定時器停止、禁止二次搶答、定時器顯示剩余時間。如果再次搶答必須由主持人再次操作“清除”和“開始”狀態開關。
目錄
一、設計任務·······································································································2
二、設計方案·······································································································2
1.設計分析········································································································································2
2.系統框圖········································································································································3
三、單元電路設計································································································3
1.搶答電路········································································································································3
2.定時電路········································································································································5
3.報警電路········································································································································7
4.時序控制電路································································································································8
四、八路搶答器總電路圖及工作流程··································································9
1.總電路圖········································································································································9
2.工作流程······································································································································10
五、總結·············································································································10
六、參考文獻·····································································································11

仿真文件 電路multisim文件.zip (2.78 MB, 售價: 2 E幣)

2023-5-14 23:12 上傳

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八路搶答器設計報告.pdf (631.33 KB, 售價: 3 E幣)

2023-5-14 23:12 上傳

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最終電路中的搶答電路由于在默認情況下顯示7,原因是由于編碼器在不編碼的時候輸出全為高導致,所以又做個改進的電路.原理一樣.只是用兩片8-3編碼構成了16-4編碼.可以跳過0號.即:選手編號變為1-8號,而不是原來的0-7號.
倒計時電路中控制到00時候停止計時,有的人用的是高位產生借位信號時候反回一信號使計時停止,但是本人沒有仿真成功.所以采用了圖中接法.原理很簡單,但是連線較多.
關于47和48,事實48完全可以代替47,但是本人仿真的時候也沒有成功.7斷a和k都試過了.百度了一下,很多人也遇到了此情況.故用47.
秒脈沖 不是很穩定.在仿真的時候可用一信號發生器代替.
關于報告中的J3開關,已經被我去掉,與j2合并在一起了.可以不必理會.
所有電路僅供參考

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