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1、摘要本文介紹了一種利用GPS授時(shí)模塊,以單片機(jī)為控制器的倒計(jì)時(shí)系統(tǒng),系統(tǒng)具有時(shí)間精度高、工作穩(wěn)定可靠、無需人工校時(shí)等特點(diǎn)。該系統(tǒng)主要實(shí)現(xiàn)的功能是在數(shù)碼管上顯示當(dāng)前時(shí)間(年月日,時(shí)分秒)以及倒計(jì)時(shí)間(天時(shí)分秒),并可以定時(shí)打鈴。硬件部分主要完成以下功能:設(shè)計(jì)GPS授時(shí)接口電路,LED顯示驅(qū)動(dòng)電路和交流電220V電鈴的驅(qū)動(dòng)接口以及戶外大功率LED倒計(jì)時(shí)顯示的驅(qū)動(dòng)。軟件部分主要是接收GPS授時(shí),把格林尼治時(shí)間轉(zhuǎn)換為北京時(shí)間,計(jì)算倒計(jì)時(shí)間,送顯示;制定打鈴表實(shí)施打鈴設(shè)計(jì)。倒計(jì)時(shí)系統(tǒng)的任務(wù),就是對(duì)某一設(shè)定日期進(jìn)行倒數(shù)
2、,在顯示屏顯示當(dāng)前距離設(shè)定日期的時(shí)間;廣泛應(yīng)用于重大的節(jié)日或活動(dòng),以增強(qiáng)人們的關(guān)切程度和緊迫感。系統(tǒng)采用大功率超亮LED進(jìn)行數(shù)碼顯示,可視距離遠(yuǎn)、可置于室外環(huán)境下,適用于要求比較高的倒計(jì)時(shí)場合。關(guān)鍵詞:GPS;授時(shí)電路;AT89C51;時(shí)鐘;打鈴AbstractThisarticletellsusaboutacountdownsystemwithGPStimer,whichiscontrolledbyMPU.Thecharacteristicsofthissystemarehighprecision,sta
3、bilization,andautomatic.Thefunctionthatthesystemmainlycarriesoutisdisplayingthecurrenttime(yearmonthday,hourcentsecond)andtheaccounttimeonthefigurestubes.Alsoitcanbeatthebellontime.Thesoftwarepartmainlycompletesthefollowingfunctions:beginningstartsofthewav
4、erateofastringgoingconnector,waitingfortheinterruption,theCPUrespondingtotheinterruption,performancingtheinterruptionserviceprocedure;WithdrawingthegiventimefromGPSsignal,convertingitintoBeijingtimeandsendingittodisplay;doingthecountdownprocessingwhenmakin
5、gupthepurposefultime,doingtheaccuratecalculationtimetosendtothedisplay;establishingthetimetable,beatingthebellontime.Themissionofthecountdownsystemistocountdownanenactmentdateandsethourofthedayonthecurrentdisplayingplaceonthemanifestationunit.Itiswidelyuse
6、dintheimportantfestivaloractivities,tostrengthenthepeople'sconcerndegreeandairoftensions.Thissystemcanbesetoutofdoorsandbeseenatlongdistancebecauseofthedisplayunitwithhigh-lightLED.KEYWORDS:GPS,89C51,Circuitacceptingtime,Clock,Bell-beatingsystem28目錄第一章系統(tǒng)總體
7、介紹11.1課題背景及研究意義11.2課題目前的發(fā)展?fàn)顩r及前景11.3設(shè)計(jì)的主要任務(wù)及目標(biāo)2第二章系統(tǒng)硬件電路設(shè)計(jì)32.1GPS實(shí)時(shí)打鈴系統(tǒng)總體設(shè)計(jì)方案32.2GPS接收模塊基本原理32.2.1GPS定義以及組成32.2.2GPS定時(shí)及定位原理42.2.3GPS時(shí)鐘的優(yōu)越性42.2.4GPS時(shí)鐘模塊原理52.3中央處理單元設(shè)計(jì)62.4GPS模塊與AT89C51的連接82.5復(fù)位電路的設(shè)計(jì)92.5.1放電型人工復(fù)位設(shè)計(jì)92.5.2DS1232看門狗模塊設(shè)計(jì)102.5.3兩種方案比較122.6顯示電路的設(shè)計(jì)13
8、2.6.1靜態(tài)顯示和動(dòng)態(tài)顯示比較132.6.274LS164和數(shù)碼管的芯片資料132.6.3顯示模塊總體設(shè)計(jì)152.7戶外倒計(jì)時(shí)顯示系統(tǒng):162.7.174HC595介紹172.7.2ULN2003驅(qū)動(dòng)大功率數(shù)碼管172.7.3電源設(shè)計(jì)182.8電鈴驅(qū)動(dòng)電路設(shè)計(jì)19第三章軟件介紹233.1接受GPS授時(shí)243.2格林尼治時(shí)間轉(zhuǎn)化成標(biāo)準(zhǔn)北京時(shí)間253.3計(jì)算倒計(jì)時(shí)253.4打鈴模塊介紹25結(jié)束語及致謝26參考文獻(xiàn)2