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[導(dǎo)讀]首先應(yīng)該了解一下蜂鳴器音樂播放的原理,在這里我只講一下電磁式蜂鳴器驅(qū)動(dòng)原理(還有一種是壓電式蜂鳴器):電磁式蜂鳴器驅(qū)動(dòng)原理:  蜂鳴器發(fā)聲原理是電流通過電磁線圈,使電磁圈產(chǎn)生磁場(chǎng)來驅(qū)動(dòng)振動(dòng)膜發(fā)聲的。因此

首先應(yīng)該了解一下蜂鳴器音樂播放的原理,在這里我只講一下電磁式蜂鳴器驅(qū)動(dòng)原理(還有一種是壓電式蜂鳴器):

電磁式蜂鳴器驅(qū)動(dòng)原理:

  蜂鳴器發(fā)聲原理是電流通過電磁線圈,使電磁圈產(chǎn)生磁場(chǎng)來驅(qū)動(dòng)振動(dòng)膜發(fā)聲的。因此需要一定的電流才能驅(qū)動(dòng)它,而單片機(jī)I/O引腳輸出的電壓較小。單片機(jī)輸出的TTLK電平基本驅(qū)動(dòng)不了蜂鳴器,因需要增加一個(gè)放大電路。這里用三極管作為放大電路。下面是原理圖:

我這里的J8端是跟芯片的P1^5端口相連,當(dāng)P1^5輸出高電平時(shí),三極管截止,蜂鳴器不發(fā)聲,反之,輸出低電平時(shí),蜂鳴器發(fā)聲。

而要驅(qū)動(dòng)蜂鳴器能像唱歌一樣的發(fā)聲,其實(shí)只要使蜂鳴器發(fā)出頻率和持續(xù)時(shí)間不同的聲音即可。周期等于頻率的倒數(shù),所以可以通過頻率知道這段的時(shí)間,所以可以通過調(diào)用延時(shí)函數(shù)或者定時(shí)器實(shí)現(xiàn),同樣的發(fā)聲的持續(xù)時(shí)間也可以通過延時(shí)函數(shù)實(shí)現(xiàn),所以讓蜂鳴器唱歌最關(guān)鍵的就是知道要延長(zhǎng)多少時(shí)間!

用單片機(jī)來演奏音樂,,只要搞清楚兩個(gè)概念就好了,分別是“音調(diào)”和“節(jié)拍”。

音調(diào)表示一個(gè)音符該唱的頻率。

節(jié)拍表示一個(gè)音符該唱多少時(shí)間。

這里有兩種方法來實(shí)現(xiàn)該功能:

(1)查表法

這個(gè)方法復(fù)雜的地方在于你要找出每個(gè)音符相對(duì)應(yīng)的頻率(根據(jù)音符;頻率對(duì)照表找),然后根據(jù)公式轉(zhuǎn)換為相應(yīng)的時(shí)間(取半周期),然后通過延時(shí)函數(shù)實(shí)現(xiàn)。最后編程實(shí)現(xiàn)。

先上代碼好了:

1/***************************************************2實(shí)驗(yàn)名稱:用蜂鳴器播放生日快樂歌3實(shí)驗(yàn)說明:不使用定時(shí)器中斷,所有頻率完全用延時(shí)實(shí)現(xiàn)4實(shí)驗(yàn)時(shí)間:2014/12/55***************************************************/67#include8#defineucharunsignedchar9#defineuintunsignedint1011sbitBEEP=P1^5;//蜂鳴器接芯片的P1^5端口1213/*生日快樂歌的音符頻率表,不同頻率由不同的延時(shí)來決定音符頻率明顯大于數(shù)組里面的值,但是因?yàn)槭?位寄15存器,所以最多只能放511,但是有的頻率大于511,所以只能在延時(shí)函數(shù)中乘上相應(yīng)的值來接近實(shí)際樂譜頻率*/17ucharcodeSONG_TONE[]=18{212,212,190,212,159,169,212,212,190,212,142,159,212,19212,106,126,159,169,190,119,119,126,159,142,159,0};2021//生日快樂歌節(jié)拍表,節(jié)拍決定每個(gè)音符的演奏長(zhǎng)短,只是取個(gè)系數(shù),并非準(zhǔn)確的值22ucharcodeSONG_LONG[]=23{9,3,12,12,12,24,9,3,12,12,12,24,9,243,12,12,12,12,12,9,3,12,12,12,24,0};2526//延時(shí)27voidDelayMS(uintx)28{29uchart;30while(x--)31for(t=0;t<120;t++);32}3334//播放函數(shù)35voidPlayMusic()36{37uinti=0,j,k;38while(SONG_LONG[i]!=0"|SONG_TONE[i]!=0)39{40/*播放各個(gè)音符,SONG_LONG為拍子長(zhǎng)度,一個(gè)節(jié)拍大概為400ms-500ms,這里的節(jié)拍又受下面一個(gè)音符的影響,所以只能根據(jù)大概的來取值*/41for(j=0;j

整個(gè)流程是這樣的:

首先根據(jù)生日快樂歌的樂譜將各個(gè)音調(diào)轉(zhuǎn)換為相應(yīng)的頻率。

比如:左邊是生日快樂歌樂譜,右邊是音符頻率轉(zhuǎn)換表

這里先來了解一下樂譜的一點(diǎn)知識(shí),左邊樂譜數(shù)字下面有點(diǎn)說明是低音,沒點(diǎn)說明就是普通的,數(shù)字上面有點(diǎn)就是高音,而5的低音就是4.5,高音是5.5,其他音符也是相應(yīng)的道理。

樂譜的左上方有寫“1=F”,而一般的樂譜都是C調(diào),就是“1=C”,注意,樂譜里面的1234567(哆啦咪發(fā)索拉西多)相對(duì)應(yīng)的不是ABCDEFG而是CDEFGAB!所以這里規(guī)定是F調(diào)的話,

那么就說明2就要唱G,3要唱A,……7要唱E,所以這里的低音5對(duì)應(yīng)的應(yīng)該是低音的1.5?。。?!就是所謂的要相應(yīng)的左移或者右移。如果還是不明白的話,看下面:

1原本對(duì)應(yīng)的應(yīng)該是C,4原本應(yīng)該對(duì)應(yīng)的是F,對(duì)吧?

然后現(xiàn)在1對(duì)應(yīng)的變成F了,就相當(dāng)于對(duì)應(yīng)了4,對(duì)吧?

那么1.5對(duì)應(yīng)的是什么?

4.5咯!

那2對(duì)應(yīng)的是什么?

5唄!

那么好了咯,低音5是4.5,是不是就是等于1.5?所以半周期就是1803μs。

至于為什么是根據(jù)半周期算,那是因?yàn)閱纹瑱C(jī)是通過循環(huán)對(duì)蜂鳴器接的端口置位,復(fù)位來使發(fā)聲的,所以就是半周期。因?yàn)槲矣玫氖菬o源的蜂鳴器,有源的蜂鳴器就是全周期了。

然后就是按照上述道理,一個(gè)個(gè)轉(zhuǎn)換,并用延時(shí)函數(shù)實(shí)現(xiàn),因?yàn)槊總€(gè)音符的轉(zhuǎn)換頻率都不一樣,要么使用多個(gè)延時(shí)函數(shù)一個(gè)個(gè)實(shí)現(xiàn)準(zhǔn)確的音調(diào)頻率,但是這樣太煩,而且單片機(jī)本身就不是專門

弄來唱歌的。我們不應(yīng)該為難他們,所以自己將就一下就算了。所以延時(shí)函數(shù)為了適應(yīng)每個(gè)音調(diào)都有差不多的頻率,這個(gè)就靠自己計(jì)算了,而且不同的歌那個(gè)值還不一樣,所以這就是這個(gè)問題

的難點(diǎn)。

接下來的就是那個(gè)唱多久的問題,一般的歌曲默認(rèn)的一個(gè)節(jié)拍是400ms-500ms。

同樣的看樂譜左上方,它有寫“3/4”,意思是以四分音符為節(jié)拍,每一個(gè)小結(jié)有三拍。

而在每個(gè)數(shù)字下面有一條橫線,那時(shí)間就是那個(gè)節(jié)拍的時(shí)間乘上0.5,有兩條就乘上0.25,三條就乘以0.125。。。音樂的基本知識(shí)就別為難我了,我是個(gè)音樂白癡。。所以我就這么理解了。。

哈哈哈哈哈~

而至于節(jié)拍轉(zhuǎn)換為頻率,也是有相應(yīng)的表的,見下:

同樣的也是通過延時(shí)函數(shù)來實(shí)現(xiàn),當(dāng)然也是會(huì)有誤差的。而至于延時(shí)函數(shù)怎么寫,見[51單片機(jī)學(xué)習(xí)筆記ONE]

編程思想的話挺簡(jiǎn)單的,就是先將音符頻率和所要唱的時(shí)間轉(zhuǎn)換好,放到兩個(gè)數(shù)組里面。然后在主程序里面,通過延時(shí)達(dá)到相應(yīng)頻率,唱完一遍,停一會(huì),接著唱就好了。

(2)用工具轉(zhuǎn)碼并用計(jì)時(shí)器實(shí)現(xiàn)

先上代碼好了:

1/*說明**************************************************************************2曲譜存貯格式unsignedcharcodeMusicName{音高,音長(zhǎng),音高,音長(zhǎng)....,0,0};末尾:0,0表示結(jié)束(Important)34音高由三位數(shù)字組成:5個(gè)位是表示1~7這七個(gè)音符6十位是表示音符所在的音區(qū):1-低音,2-中音,3-高音;7百位表示這個(gè)音符是否要升半音:0-不升,1-升半音。89音長(zhǎng)最多由三位數(shù)字組成:10個(gè)位表示音符的時(shí)值,其對(duì)應(yīng)關(guān)系是:11|數(shù)值(n):|0|1|2|3|4|5|612|幾分音符:|1|2|4|8|16|32|64音符=2^n13十位表示音符的演奏效果(0-2):0-普通,1-連音,2-頓音14百位是符點(diǎn)位:0-無符點(diǎn),1-有符點(diǎn)1516調(diào)用演奏子程序的格式17Play(樂曲名,調(diào)號(hào),升降八度,演奏速度);18|樂曲名:要播放的樂曲指針,結(jié)尾以(0,0)結(jié)束;19|調(diào)號(hào)(0-11):是指樂曲升多少個(gè)半音演奏;20|升降八度(1-3):1:降八度,2:不升不降,3:升八度;21|演奏速度(1-12000):值越大速度越快;2223***************************************************************************/24#ifndef__SOUNDPLAY_H_REVISION_FIRST__25#define__SOUNDPLAY_H_REVISION_FIRST__2627#include2829//**************************************************************************3031#defineSYSTEM_OSC11059200//12000000//定義晶振頻率12000000HZ32#defineSOUND_SPACE4/5//定義普通音符演奏的長(zhǎng)度分率,//每4分音符間隔33sbitBeepIO=P1^5;//定義輸出管腳3435unsignedintcodeFreTab[12]={262,277,294,311,330,349,369,392,415,440,466,494};//原始頻率表36unsignedcharcodeSignTab[7]={0,2,4,5,7,9,11};//1~7在頻率表中的位置37unsignedcharcodeLengthTab[7]={1,2,4,8,16,32,64};38unsignedcharSound_Temp_TH0,Sound_Temp_TL0;//音符定時(shí)器初值暫存39unsignedcharSound_Temp_TH1,Sound_Temp_TL1;//音長(zhǎng)定時(shí)器初值暫存40//**************************************************************************41voidInitialSound(void)42{43BeepIO=1;44Sound_Temp_TH1=(65535-(1/1200)*SYSTEM_OSC)/256;//計(jì)算TL1應(yīng)裝入的初值(10ms的初裝值)45Sound_Temp_TL1=(65535-(1/1200)*SYSTEM_OSC)%256;//計(jì)算TH1應(yīng)裝入的初值46TH1=Sound_Temp_TH1;47TL1=Sound_Temp_TL1;48TMOD|=0x11;49ET0=1;50ET1=0;51TR0=0;52TR1=0;53EA=1;54}5556voidBeepTimer0(void)interrupt1//音符發(fā)生中斷57{58BeepIO=!BeepIO;59TH0=Sound_Temp_TH0;60TL0=Sound_Temp_TL0;61}62//**************************************************************************63voidPlay(unsignedchar*Sound,unsignedcharSignature,unsignedOctachord,unsignedintSpeed)64{65unsignedintNewFreTab[12];//新的頻率表66unsignedchari,j;67unsignedintPoint,LDiv,LDiv0,LDiv1,LDiv2,LDiv4,CurrentFre,Temp_T,SoundLength;68unsignedcharTone,Length,SL,SH,SM,SLen,XG,FD;69for(i=0;i11)73{74j=j-12;75NewFreTab[i]=FreTab[j]*2;76}77else78NewFreTab[i]=FreTab[j];7980if(Octachord==1)81NewFreTab[i]>>=2;82elseif(Octachord==3)83NewFreTab[i]<<=2;84}8586SoundLength=0;87while(Sound[SoundLength]!=0x00)//計(jì)算歌曲長(zhǎng)度88{89SoundLength+=2;90}9192Point=0;93Tone=Sound[Point];94Length=Sound[Point+1];//讀出第一個(gè)音符和它時(shí)時(shí)值9596LDiv0=12000/Speed;//算出1分音符的長(zhǎng)度(幾個(gè)10ms)97LDiv4=LDiv0/4;//算出4分音符的長(zhǎng)度98LDiv4=LDiv4-LDiv4*SOUND_SPACE;//普通音最長(zhǎng)間隔標(biāo)準(zhǔn)99TR0=0;100TR1=1;101while(Point>=2;//低音110if(SM==3)CurrentFre<<=2;//高音111Temp_T=65536-(50000/CurrentFre)*10/(12000000/SYSTEM_OSC);//計(jì)算計(jì)數(shù)器初值112Sound_Temp_TH0=Temp_T/256;113Sound_Temp_TL0=Temp_T%256;114TH0=Sound_Temp_TH0;115TL0=Sound_Temp_TL0+12;//加12是對(duì)中斷延時(shí)的補(bǔ)償116}117SLen=LengthTab[Length%10];//算出是幾分音符118XG=Length/10%10;//算出音符類型(0普通1連音2頓音)119FD=Length/100;120LDiv=LDiv0/SLen;//算出連音音符演奏的長(zhǎng)度(多少個(gè)10ms)121if(FD==1)122LDiv=LDiv+LDiv/2;123if(XG!=1)124if(XG==0)//算出普通音符的演奏長(zhǎng)度125if(SLen0;i--)//發(fā)規(guī)定長(zhǎng)度的音139{140while(TF1==0);141TH1=Sound_Temp_TH1;142TL1=Sound_Temp_TL1;143TF1=0;144}145}146if(LDiv2!=0)147{148TR0=0;BeepIO=1;149for(i=LDiv2;i>0;i--)//音符間的間隔150{151while(TF1==0);152TH1=Sound_Temp_TH1;153TL1=Sound_Temp_TL1;154TF1=0;155}156}157Point+=2;158Tone=Sound[Point];159Length=Sound[Point+1];160}161BeepIO=1;162}163//**************************************************************************164#endif165166167168//揮著翅膀的女孩169unsignedcharcodeMusic_Girl[]={0x17,0x02,0x17,0x03,0x18,0x03,0x19,0x02,0x15,0x03,1700x16,0x03,0x17,0x03,0x17,0x03,0x17,0x03,0x18,0x03,1710x19,0x02,0x16,0x03,0x17,0x03,0x18,0x02,0x18,0x03,1720x17,0x03,0x15,0x02,0x18,0x03,0x17,0x03,0x18,0x02,1730x10,0x03,0x15,0x03,0x16,0x02,0x15,0x03,0x16,0x03,1740x17,0x02,0x17,0x03,0x18,0x03,0x19,0x02,0x1A,0x03,1750x1B,0x03,0x1F,0x03,0x1F,0x03,0x17,0x03,0x18,0x03,1760x19,0x02,0x16,0x03,0x17,0x03,0x18,0x03,0x17,0x03,1770x18,0x03,0x1F,0x03,0x1F,0x02,0x16,0x03,0x17,0x03,1780x18,0x03,0x17,0x03,0x18,0x03,0x20,0x03,0x20,0x02,1790x1F,0x03,0x1B,0x03,0x1F,0x66,0x20,0x03,0x21,0x03,1800x20,0x03,0x1F,0x03,0x1B,0x03,0x1F,0x66,0x1F,0x03,1810x1B,0x03,0x19,0x03,0x19,0x03,0x15,0x03,0x1A,0x66,1820x1A,0x03,0x19,0x03,0x15,0x03,0x15,0x03,0x17,0x03,1830x16,0x66,0x17,0x04,0x18,0x04,0x18,0x03,0x19,0x03,1840x1F,0x03,0x1B,0x03,0x1F,0x66,0x20,0x03,0x21,0x03,1850x20,0x03,0x1F,0x03,0x1B,0x03,0x1F,0x66,0x1F,0x03,1860x1B,0x03,0x19,0x03,0x19,0x03,0x15,0x03,0x1A,0x66,1870x1A,0x03,0x19,0x03,0x19,0x03,0x1F,0x03,0x1B,0x03,1880x1F,0x00,0x1A,0x03,0x1A,0x03,0x1A,0x03,0x1B,0x03,1890x1B,0x03,0x1A,0x03,0x19,0x03,0x19,0x02,0x17,0x03,1900x15,0x17,0x15,0x03,0x16,0x03,0x17,0x03,0x18,0x03,1910x17,0x04,0x18,0x0E,0x18,0x03,0x17,0x04,0x18,0x0E,1920x18,0x66,0x17,0x03,0x18,0x03,0x17,0x03,0x18,0x03,1930x20,0x03,0x20,0x02,0x1F,0x03,0x1B,0x03,0x1F,0x66,1940x20,0x03,0x21,0x03,0x20,0x03,0x1F,0x03,0x1B,0x03,1950x1F,0x66,0x1F,0x04,0x1B,0x0E,0x1B,0x03,0x19,0x03,1960x19,0x03,0x15,0x03,0x1A,0x66,0x1A,0x03,0x19,0x03,1970x15,0x03,0x15,0x03,0x17,0x03,0x16,0x66,0x17,0x04,1980x18,0x04,0x18,0x03,0x19,0x03,0x1F,0x03,0x1B,0x03,1990x1F,0x66,0x20,0x03,0x21,0x03,0x20,0x03,0x1F,0x03,2000x1B,0x03,0x1F,0x66,0x1F,0x03,0x1B,0x03,0x19,0x03,2010x19,0x03,0x15,0x03,0x1A,0x66,0x1A,0x03,0x19,0x03,2020x19,0x03,0x1F,0x03,0x1B,0x03,0x1F,0x00,0x18,0x02,2030x18,0x03,0x1A,0x03,0x19,0x0D,0x15,0x03,0x15,0x02,2040x18,0x66,0x16,0x02,0x17,0x02,0x15,0x00,0x00,0x00};205//同一首歌206unsignedcharcodeMusic_Same[]={0x0F,0x01,0x15,0x02,0x16,0x02,0x17,0x66,0x18,0x03,2070x17,0x02,0x15,0x02,0x16,0x01,0x15,0x02,0x10,0x02,2080x15,0x00,0x0F,0x01,0x15,0x02,0x16,0x02,0x17,0x02,2090x17,0x03,0x18,0x03,0x19,0x02,0x15,0x02,0x18,0x66,2100x17,0x03,0x19,0x02,0x16,0x03,0x17,0x03,0x16,0x00,2110x17,0x01,0x19,0x02,0x1B,0x02,0x1B,0x70,0x1A,0x03,2120x1A,0x01,0x19,0x02,0x19,0x03,0x1A,0x03,0x1B,0x02,2130x1A,0x0D,0x19,0x03,0x17,0x00,0x18,0x66,0x18,0x03,2140x19,0x02,0x1A,0x02,0x19,0x0C,0x18,0x0D,0x17,0x03,2150x16,0x01,0x11,0x02,0x11,0x03,0x10,0x03,0x0F,0x0C,2160x10,0x02,0x15,0x00,0x1F,0x01,0x1A,0x01,0x18,0x66,2170x19,0x03,0x1A,0x01,0x1B,0x02,0x1B,0x03,0x1B,0x03,2180x1B,0x0C,0x1A,0x0D,0x19,0x03,0x17,0x00,0x1F,0x01,2190x1A,0x01,0x18,0x66,0x19,0x03,0x1A,0x01,0x10,0x02,2200x10,0x03,0x10,0x03,0x1A,0x0C,0x18,0x0D,0x17,0x03,2210x16,0x00,0x0F,0x01,0x15,0x02,0x16,0x02,0x17,0x70,2220x18,0x03,0x17,0x02,0x15,0x03,0x15,0x03,0x16,0x66,2230x16,0x03,0x16,0x02,0x16,0x03,0x15,0x03,0x10,0x02,2240x10,0x01,0x11,0x01,0x11,0x66,0x10,0x03,0x0F,0x0C,2250x1A,0x02,0x19,0x02,0x16,0x03,0x16,0x03,0x18,0x66,2260x18,0x03,0x18,0x02,0x17,0x03,0x16,0x03,0x19,0x00,2270x00,0x00};228//兩只蝴蝶229unsignedcharcodeMusic_Two[]={0x17,0x03,0x16,0x03,0x17,0x01,0x16,0x03,0x17,0x03,2300x16,0x03,0x15,0x01,0x10,0x03,0x15,0x03,0x16,0x02,2310x16,0x0D,0x17,0x03,0x16,0x03,0x15,0x03,0x10,0x03,2320x10,0x0E,0x15,0x04,0x0F,0x01,0x17,0x03,0x16,0x03,2330x17,0x01,0x16,0x03,0x17,0x03,0x16,0x03,0x15,0x01,2340x10,0x03,0x15,0x03,0x16,0x02,0x16,0x0D,0x17,0x03,2350x16,0x03,0x15,0x03,0x10,0x03,0x15,0x03,0x16,0x01,2360x17,0x03,0x16,0x03,0x17,0x01,0x16,0x03,0x17,0x03,2370x16,0x03,0x15,0x01,0x10,0x03,0x15,0x03,0x16,0x02,2380x16,0x0D,0x17,0x03,0x16,0x03,0x15,0x03,0x10,0x03,2390x10,0x0E,0x15,0x04,0x0F,0x01,0x17,0x03,0x19,0x03,2400x19,0x01,0x19,0x03,0x1A,0x03,0x19,0x03,0x17,0x01,2410x16,0x03,0x16,0x03,0x16,0x02,0x16,0x0D,0x17,0x03,2420x16,0x03,0x15,0x03,0x10,0x03,0x10,0x0D,0x15,0x00,2430x19,0x03,0x19,0x03,0x1A,0x03,0x1F,0x03,0x1B,0x03,2440x1B,0x03,0x1A,0x03,0x17,0x0D,0x16,0x03,0x16,0x03,2450x16,0x0D,0x17,0x01,0x17,0x03,0x17,0x03,0x19,0x03,2460x1A,0x02,0x1A,0x02,0x10,0x03,0x17,0x0D,0x16,0x03,2470x16,0x01,0x17,0x03,0x19,0x03,0x19,0x03,0x17,0x03,2480x19,0x02,0x1F,0x02,0x1B,0x03,0x1A,0x03,0x1A,0x0E,2490x1B,0x04,0x17,0x02,0x1A,0x03,0x1A,0x03,0x1A,0x0E,2500x1B,0x04,0x1A,0x03,0x19,0x03,0x17,0x03,0x16,0x03,2510x17,0x0D,0x16,0x03,0x17,0x03,0x19,0x01,0x19,0x03,2520x19,0x03,0x1A,0x03,0x1F,0x03,0x1B,0x03,0x1B,0x03,2530x1A,0x03,0x17,0x0D,0x16,0x03,0x16,0x03,0x16,0x03,2540x17,0x01,0x17,0x03,0x17,0x03,0x19,0x03,0x1A,0x02,2550x1A,0x02,0x10,0x03,0x17,0x0D,0x16,0x03,0x16,0x01,2560x17,0x03,0x19,0x03,0x19,0x03,0x17,0x03,0x19,0x03,2570x1F,0x02,0x1B,0x03,0x1A,0x03,0x1A,0x0E,0x1B,0x04,2580x17,0x02,0x1A,0x03,0x1A,0x03,0x1A,0x0E,0x1B,0x04,2590x17,0x16,0x1A,0x03,0x1A,0x03,0x1A,0x0E,0x1B,0x04,2600x1A,0x03,0x19,0x03,0x17,0x03,0x16,0x03,0x0F,0x02,2610x10,0x03,0x15,0x00,0x00,0x00};262263unsignedcharcodeMusic_birth[]={0x0F,0x03,0x0F,0x03,0x10,0x02,0x0F,0x02,0x15,0x02,0x11,0x01,0x0F,0x03,2640x0F,0x03,0x10,0x02,0x0F,0x02,0x16,0x02,0x15,0x01,0x0F,0x03,0x0F,0x03,2650x19,0x02,0x17,0x02,0x15,0x02,0x11,0x0C,0x10,0x02,0x18,0x03,0x18,0x03,2660x17,0x02,0x15,0x02,0x16,0x02,0x17,0x01,0x0F,0x02,0x0F,0x03,0x10,0x03,2670x0F,0x02,0x15,0x02,0x11,0x01,0x0F,0x03,0x0F,0x03,0x10,0x02,0x0F,0x02,2680x16,0x02,0x15,0x01,0x0F,0x03,0x0F,0x03,0x19,0x02,0x17,0x02,0x15,0x02,2690x11,0x0C,0x10,0x02,0x18,0x03,0x18,0x03,0x17,0x02,0x15,0x02,0x16,0x02,2700x10,0x01,0x00,0x00};271272voidmain()273{274275InitialSound();276277278while(1)279{280Play(Music_Girl,0,2,350);281Play(Music_Same,0,2,350);282Play(Music_Two,0,2,350);283Play(Music_birth,0,2,350);284}285}

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在現(xiàn)代城市建設(shè)中,街道及停車場(chǎng)照明作為基礎(chǔ)設(shè)施的重要組成部分,其質(zhì)量和效率直接關(guān)系到城市的公共安全、居民生活質(zhì)量和能源利用效率。隨著科技的進(jìn)步,高亮度白光發(fā)光二極管(LED)因其獨(dú)特的優(yōu)勢(shì)逐漸取代傳統(tǒng)光源,成為大功率區(qū)域...

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LED通用照明設(shè)計(jì)工程師會(huì)遇到許多挑戰(zhàn),如功率密度、功率因數(shù)校正(PFC)、空間受限和可靠性等。

關(guān)鍵字: LED 驅(qū)動(dòng)電源 功率因數(shù)校正

在LED照明技術(shù)日益普及的今天,LED驅(qū)動(dòng)電源的電磁干擾(EMI)問題成為了一個(gè)不可忽視的挑戰(zhàn)。電磁干擾不僅會(huì)影響LED燈具的正常工作,還可能對(duì)周圍電子設(shè)備造成不利影響,甚至引發(fā)系統(tǒng)故障。因此,采取有效的硬件措施來解決L...

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開關(guān)電源具有效率高的特性,而且開關(guān)電源的變壓器體積比串聯(lián)穩(wěn)壓型電源的要小得多,電源電路比較整潔,整機(jī)重量也有所下降,所以,現(xiàn)在的LED驅(qū)動(dòng)電源

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LED驅(qū)動(dòng)電源是把電源供應(yīng)轉(zhuǎn)換為特定的電壓電流以驅(qū)動(dòng)LED發(fā)光的電壓轉(zhuǎn)換器,通常情況下:LED驅(qū)動(dòng)電源的輸入包括高壓工頻交流(即市電)、低壓直流、高壓直流、低壓高頻交流(如電子變壓器的輸出)等。

關(guān)鍵字: LED 隧道燈 驅(qū)動(dòng)電源
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