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標(biāo)題: Multisim仿真8路搶答器設(shè)計(jì)資料,帶完整ms文件與設(shè)計(jì)論文等 [打印本頁]
作者: eng    時(shí)間: 2021-7-29 23:57
標(biāo)題: Multisim仿真8路搶答器設(shè)計(jì)資料,帶完整ms文件與設(shè)計(jì)論文等
一、 設(shè)計(jì)任務(wù)
1. 搶答器同時(shí)供 8 名選手或 8 個(gè)代表隊(duì)比賽，分別用 8 個(gè)按鈕 S0 ~ S7 表示。
2. 設(shè)置一個(gè)系統(tǒng)清除和搶答控制開關(guān) S，該開關(guān)由主持人控制。
3. 搶答器具有鎖存與顯示功能。即選手按動(dòng)按鈕，鎖存相應(yīng)的編號(hào)，并在 LED 數(shù)碼管上顯示，同時(shí)揚(yáng)聲器發(fā)出報(bào)警聲響提示。選手搶答實(shí)行優(yōu)先鎖存，優(yōu)先搶答選手的編號(hào)一直保持到主持人將系統(tǒng)清除為止。
4. 搶答器具有定時(shí)搶答功能，且一次搶答的時(shí)間由主持人設(shè)定（如 30 秒）。當(dāng)主持人啟動(dòng)"開始"鍵后，定時(shí)器進(jìn)行減計(jì)時(shí)，同時(shí)揚(yáng)聲器發(fā)出短暫的聲響，聲響持續(xù)的時(shí)間 0.5 秒左右。
5. 參賽選手在設(shè)定的時(shí)間內(nèi)進(jìn)行搶答，搶答有效，定時(shí)器停止工作，顯示器上顯示選手的編號(hào)和搶答的時(shí)間，并保持到主持人將系統(tǒng)清除為止。
6. 如果定時(shí)時(shí)間已到，無人搶答，本次搶答無效，系統(tǒng)報(bào)警并禁止搶答，定時(shí)顯示器上顯示 00。
二、設(shè)計(jì)方案
1.設(shè)計(jì)分析
搶答器具有鎖存、定時(shí)、顯示和報(bào)警功能。即當(dāng)搶答開始后，選手搶答按動(dòng)按鈕，鎖存器鎖存相應(yīng)的選手編碼，同時(shí)用 LED 數(shù)碼管把選手的編碼顯示出來，并且開始搶答時(shí)間的倒計(jì)時(shí)，同時(shí)用 LED 數(shù)碼管把選手的所剩搶答時(shí)間顯示出來。而在選手按鍵搶答以及搶答時(shí)間倒計(jì)時(shí)到時(shí)的時(shí)候都有報(bào)警以提醒主持人和選手。搶答時(shí)間設(shè)定 30 秒。接通電源后，主持人將開關(guān)撥到“清除”狀態(tài)，搶答器處于禁止?fàn)顟B(tài)，編號(hào)顯示器滅燈，定時(shí)器顯示設(shè)定時(shí)間；主持人將開關(guān)置“開始”狀態(tài)，宣布“開始”搶答器工作。定時(shí)器倒計(jì)時(shí)。選手在定時(shí)時(shí)間內(nèi)搶答時(shí)，搶答器完成：優(yōu)先判斷、編號(hào)鎖存、編號(hào)顯示、揚(yáng)聲器提示。當(dāng)一輪搶答之后，定時(shí)器停止、禁止二次搶答、定時(shí)器顯示剩余時(shí)間。如果再次搶答必須由主持人再次操作“清除”和“開始”狀態(tài)開關(guān)。
目錄
一、設(shè)計(jì)任務(wù)·······································································································2
二、設(shè)計(jì)方案·······································································································2
1.設(shè)計(jì)分析········································································································································2
2.系統(tǒng)框圖········································································································································3
三、單元電路設(shè)計(jì)································································································3
1.搶答電路········································································································································3
2.定時(shí)電路········································································································································5
3.報(bào)警電路········································································································································7
4.時(shí)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(jié)·············································································································10
六、參考文獻(xiàn)·····································································································11

仿真文件 電路multisim文件.zip (2.78 MB, 售價(jià): 2 E幣)
完整文檔
八路搶答器設(shè)計(jì)報(bào)告.pdf (631.33 KB, 售價(jià): 3 E幣)

最終電路中的搶答電路由于在默認(rèn)情況下顯示7,原因是由于編碼器在不編碼的時(shí)候輸出全為高導(dǎo)致,所以又做個(gè)改進(jìn)的電路.原理一樣.只是用兩片8-3編碼構(gòu)成了16-4編碼.可以跳過0號(hào).即:選手編號(hào)變?yōu)?-8號(hào),而不是原來的0-7號(hào).
倒計(jì)時(shí)電路中控制到00時(shí)候停止計(jì)時(shí),有的人用的是高位產(chǎn)生借位信號(hào)時(shí)候反回一信號(hào)使計(jì)時(shí)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(jiǎn)單,但是連線較多.
關(guān)于47和48,事實(shí)48完全可以代替47,但是本人仿真的時(shí)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(wěn)定.在仿真的時(shí)候可用一信號(hào)發(fā)生器代替.
關(guān)于報(bào)告中的J3開關(guān),已經(jīng)被我去掉,與j2合并在一起了.可以不必理會(huì).
所有電路僅供參考



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