毕业论文基于at89c51单片机的led彩灯控制电路的设计

1、杭州职业技术学院 毕业设计论文题 目 彩灯控制电路的设计系 别 信息电子系 专 业 应用电子技术 班 级 学 号 姓 名 指导教师 2011年5 月10 日目录第1章概述3课题的背景与意义3总体设计方案4第2章硬件电路设计5单机片最小系统5按键控制电路6中断电路62.4 LED显示电路7单机片的介绍8第3章软件设计11软件设计思路11软件设计流程12参考文献13附录A 课题设计电路原理图14附录B 课程设计系统程序15致 谢22彩灯控制电路设计【摘要】 本文介绍了一种由16个LED发光二极管组成多功能发光形式的简易彩灯控制系统的软硬件设计过程，方案以AT89C51单片机作为主控核心， 且以复位

2、电路、时钟电路、按键电路、中断电路以及彩灯显示电路组成，利用软件编程烧录程序到单片机来实现对LED彩灯进行多样控制。该控制电路能完成多种闪灯模式以及随意变换想要的闪烁方式和控制彩灯的闪烁频率等功能。该系统具有电路结构简单、易操作、硬件少、体积少、本钱低、能耗低等优点，有一定的实用价值。【关键词】8051单片机，LED彩灯，控制系统，闪烁方式第1章 概述现代化生活当中彩灯控制电路的应用越来越受到人们的喜欢，因为其不仅能美化环境，渲染气氛，还可以用于娱乐场所和电子玩具、广告牌当中等，因此我们选择了4种不同方式控制点亮16个LED发光二极管的彩灯控制电路设计作为毕业课题，利用本人在大学期间所学的模拟

3、电子技术、通讯电路、语言程序设计等一些课程的知识进行了这次毕业课题设计与制作，这次设计能在很大程度上提高了我们个人的学以致用能力和实际独立操作能力，不管是对知识的运用还是对论文的撰写方面都有了很大的提高，同时也为了我们以后踏上社途工作开展打下了良好的根底。彩灯控制电路的设计，其电路设计品种多样，工作电压范围宽，功耗低，外围元件少，因此适用于现实生活中多种电子产品的开发设计与制作。此课题设计的作品不能为了只追求“跳跃而给人凌乱的感觉，不管采用何种色彩、何种图案，都应该聚而不散，且有顺序的渐变和跳跃，给观众一种主次感、秩序感，也方便于群众顺着有规律的节奏接着看第二遍、第三遍。在设计制作时，既要给人

4、带来变换的吸引力，又要显得主次清楚，没有色彩和图案凌乱的感觉。变换、闪烁、跳跃式的彩灯为市场促进了销售，为生活营造了多姿多彩的气氛，因此，越来越受到人们的肯定、重视、欢送。设计思路: 本方案这要是通过对基于单片机的多控制、多闪烁方式的LED彩灯循环系统的设计，来到达本设计的要求。本课题设计的总体框图如下列图1-2所示图1-2 系统总体设计框图系统设计如下：此设计方案中单片机的P1口接4路按键控制电路，实现彩灯闪烁方式的切换功能；单片机的P3.3引脚接上一个按键开关以实现对彩灯中断的控制；单片机上的P0和P2口接16路LED发光二极管组成彩灯显示电路，实现多种形式的闪烁功能。第二章 硬件电路设计

5、要使单片机工作起来，最根本的电路构成由单片机、时钟电路、复位电路等组成。单片机最小系统由复位电路和时钟信号电路组成如图2-1。复位电路：确定单片机工作的起始状态，完成单片机的启动过程。单片机系统的复位方式有上电自动复位和手动按键复位。本设计采用上电自动复位。单片机最小系统还有一块模块叫时钟电路。时钟电路由一个晶振和两个小电容组成，用来产生时钟频率。AT89C51单片机芯片内部有一个反向放大器构成的振荡器，XTAL1和XTAL2分别为振荡器电路的输入端和输出端，时钟可由内部和外部生成，在XTAL1和XTAL2引脚上外接定时元件，内部振荡电路就会产生自激振荡。系统采用的定时元件为石英晶体和电容组成

6、的并联谐振回路。晶振频率选择12MHz，电容值取30PF,电容的大小频率起微调的作用。复位电路时钟电路图2-1 单片机最小系统图按键控制电路如图2-2是由4个按键开关构成的。他们分别接在单片机AT89C51的P1.0P1.3引脚上，为了一对一方式控制16个LED彩灯的不同闪烁形式。当按下开关key1时，16个LED发光二极管闪烁第一种彩灯方式；当按下开关key2时，16个LED发光二极管闪烁第二种彩灯方式；同理，当按下开关key3时，16个LED发光二极管闪烁第三种彩灯方式；当按下开关key4时，16个LED发光二极管闪烁第四种彩灯方式。key3key2key4key1图2-2 按键控制电路图

7、路单片机的P3.3引脚街上一个按键开关以实现对彩灯中断的控制如图2-3。当彩灯系统正在实现无论哪一种控制方式时，按下中断开关使过程终止，16个LED发光二极管同时会处于熄灭状态，停止当前工作；当再次按一下中断开关时，彩灯系统会继续进行工作，闪光方式会与中断之前的方式一样。如图2-3 中断控制电路图2.4 LED显示电路流水灯采用的是发光二极管Light-Emitting Diode，简称LED，是一种将电能转换为光能的半导体器件，具有体积小、耗电低的优点，常被用作微型计算机与数字电路的输出装置。当LED两端加上一定的正向电压，使之流过一定的工作电流就会发光，其亮度随流过的电流增加而增加，但电流

8、过大LED的寿命也将缩短。普通LED正向电流一般为520mA。由于51 的I/O 是弱上拉的方式，在输出高电平时，只能输出几十微安的电流，而在输出低电平时，I/O最大可以输入几十毫安的电流。所以，通常采用灌电流的方式，即电流从电源经LED流向I/O口。为了不让流过LED的电流太大而把它烧坏，还得串上限流电阻R，当P0和P2口输出高电平+5V时，LED两端没有电压降，所以熄灭；当P0和P2口输出低电平即P0/P2=0时, LED正向导通发光。此时LED两端电压VD约为1.7V，那么限流电阻R两端将存在3.3V即5-1.7=3.3V。查阅AT89C51技术手册后发现，单个I/O口的输入电流不能超过

9、10mA；P0口的输入电流总和不能超过26mA；P1、P2、P3的输入电流总和不能超过15mA；所有I/O口的输入电流总和不能超过71mA。如图2-4图2-4 led显示电路图AT89C51管脚图如下列图2-5所示图2-5 AT89C51引脚排列VCC：供电电压+5V。GND：接地。P0口：P0口为一个8位漏级开路双向I/O口，每脚可吸收8TTL门电流。当P1口的管脚第一次写1时，被定义为高阻输入。P0能够用于外部程序数据存储器，它可以被定义为数据/地址的第八位。在FIASH编程时，P0口作为原码输入口，当FIASH进行校验时，P0输出原码，此时P0外部必须被拉高。本系统中P0口接LED数码管

10、的段选段。 P1口：P1口是一个内部提供上拉电阻的8位双向I/O口，P1口缓冲器能接收输出4TTL门电流。P1口管脚写入1后，被内部上拉为高，可用作输入，P1口被外部下拉为低电平时，将输出电流，这是由于内部上拉的缘故。在FLASH编程和校验时，P1口作为第八位地址接收7。P2口：P2口为一个内部上拉电阻的8位双向I/O口，P2口缓冲器可接收，输出4个TTL门电流，当P2口被写“1”时，其管脚被内部上拉电阻拉高，且作为输入。并因此作为输入时，P2口的管脚被外部拉低，将输出电流。这是由于内部上拉的缘故。P2口当用于外部程序存储器或16位地址外部数据存储器进行存取时，P2口输出地址的高八位。在给出地

11、址“1”时，它利用内部上拉优势，当对外部八位地址数据存储器进行读写时，P2口输出其特殊功能存放器的内容。P2口在FLASH编程和校验时接收高八位地址信号和控制信号。本系统中语音芯片ISD1420的地址端接P2口。P3口：P3口是8个带内部上拉电阻的双向I/O口，可接收输出4个TTL门电流。当P3口写入“1”后，它们被内部上拉为高电平，并用作输入。作为输入，由于外部下拉为低电平，P3口将输出电流，这是由于上拉的缘故。P3口也可作为AT89C51的一些特殊功能口，如表2.5所示。P3口同时为闪烁编程和编程校验接收一些控制信号。表P3口的第二功能口管脚备选功能信号名称RXD串行输入口TXD串行输出口

12、/INT0外部中断0/INT1外部中断1T0记时器0外部输入T1记时器1外部输入/WR外部数据存储器写选通/RD外部数据存储器读选通RST：复位输入。当振荡器复位器件时，要保持RST脚两个机器周期的高电平时间。ALE/PROG：当访问外部存储器时，地址锁存允许的输出电平用于锁存地址的地位字节。在平时，ALE端以不变的频率周期输出正脉冲信号，此频率为振荡器频率的1/6。因此它可用作对外部输出的脉冲或用于定时目的。然而要注意的是：每当用作外部数据存储器时，将跳过一个ALE脉冲。如想禁止ALE的输出可在SFR8EH地址上置0。此时， ALE只有在执行MOVX，MOVC指令是ALE才起作用。另外，该引

13、脚被略微拉高。如果微处理器在外部执行状态ALE禁止，置位无效。PSEN：外部程序存储器的选通信号。在由外部程序存储器取指期间，每个机器周期两次/PSEN有效。在访问外部数据存储器时，这两次有效的PSEN信号将不出现。EA/VPP：当/EA保持低电平时，那么在此期间外部程序存储器0000H-FFFFH，不管是否有内部程序存储器。注意加密方式1时，EA将内部锁定为RESET；当EA端保持高电平时，此间内部程序存储器。在本设计中，对ROM的读操作只在内部程序存储器中，所以EA置应高电平。XTAL1：反向振荡放大器的输入及内部时钟工作电路的输入。XTAL2：来自反向振荡器的输出8。第三章 软件设计单片

14、机的应用系统由硬件和软件组成，上述硬件各电路搭建完成后，我们还不能看到多控制、多闪烁方式的LED灯系统循环点亮的现象，我们还需要告诉单片机怎么样进行控制，即编写程序控制单片机管脚电平的上下变化，来实现发光二极管的闪烁。软件编程是多控制、多闪烁方式的LED灯系统中的一个重要的组成局部，是本设计的重点和难点。所以我来阐述多控制、多闪烁方式的LED灯系统是如何实现16个LED灯的循环点亮，来介绍实现流水灯控制的软件编程方法。本设计是以单片机AT89C51为核心控制16个发光二极管4种闪烁方式的变换。硬件电路如图附录A所示，16个发光二极管分别接在单片机的P0和P“0时，发光二极管点亮，当输出“1时，

15、发光二极管熄灭。同理，接在P0和P2口的其他15个LED的点亮和熄灭的方法同。因此，要实现流水灯功能，我们只要将发光二极管按照不同方式依次点亮、熄灭，16只LED灯便会一亮一暗的成流水灯了。程序设计流程如图3-2。图3-2 程序设计流程图参考文献1. 曹天汉，?模拟电子技术?，北京师范大学出版社 2005年 8月2. 侯玉宝、陈忠平、李成群，?基于Proteus的51系列单片机设计与仿真?电子工业出版社 2021年9月3. 曹天汉、钱卫星、张雪娟，?单片机原理与接口技术?第3版，电子工业出版社2021年3月4. 李全利 ，?单片机原理与接口技术?M，高等教育出版社 2006年12月5. 李忠国

16、、陈刚 ，?单片机应用技能实训?，人民邮电出版社 2006年附录A 课题设计电路原理图附录B 课程设计系统程序#include<reg51.h>#define uint unsigned int#define uchar unsigned charconst tab1=0xFE,0xFD,0xFB,0xF7,0xEF,0xDF,0xBF,0x7F;const tab2=0xFF,0xFE,0xFC,0xF8,0xF0,0xE0,0xC0,0x80,0x00;const tab3=0xFF,0x7F,0x3F,0x1F,0x0F,0x07,0x03,0x01,0x00;const t

17、ab4=0xFF,0xFE,0xFA,0xEA,0xAA,0x2A,0x0A,0x02,0x00; /1,3,5,7const tab5=0xFF,0x7F,0x5F,0x57,0x55,0x54,0x50,0x40,0x00; /2,4,6,8uchar key=0;uchar state=0;uchar stateTemp=0;uchar flag=0;void delay(uint n)/延时uint i;for(i=0;i<n;i+);void fun1(void)P0=0x00;P2=0x00;delay(30000);P0=0xff;P2=0xff;delay(30000);

18、 void fun2(void)uchar i;for(i=0;i<8;i+)/向上逐次单个点亮P2=tab17-i;delay(10000);if(state!=2)P0=0xFF;P2=0xFF;return;P2=0xFF;for(i=0;i<8;i+)P0=tab17-i;delay(10000);if(state!=2)P0=0xFF;P2=0xFF;return;P0=0xFF;for(i=0;i<8;i+) /向下逐次单个点亮P0=tab1i;delay(10000);if(state!=2)P0=0xFF;P2=0xFF;return;P0=0xFF;for(

19、i=0;i<8;i+)P2=tab1i;delay(10000);if(state!=2)P0=0xFF;P2=0xFF;return;P2=0xFF;void fun3(void)uchar i;for(i=0;i<9;i+)P0=tab4i;P2=tab5i;delay(25000);if(state!=3)P0=0xFF;P2=0xFF;return;for(i=0;i<3;i+)P0=0xAA;P2=0xAA;delay(20000);P0=0x55;P2=0x55;delay(20000);if(state!=3)P0=0xFF;P2=0xFF;return;for

20、(i=0;i<9;i+)P0=tab48-i;P2=tab58-i;delay(25000);if(state!=3)P0=0xFF;P2=0xFF;return; void fun4(void)uchar i;for(i=0;i<9;i+) /向上逐个点亮P2=tab3i;delay(10000);if(state!=4)P0=0xFF;P2=0xFF;return;for(i=0;i<9;i+)P0=tab3i;delay(10000);if(state!=4)P0=0xFF;P2=0xFF;return;for(i=0;i<9;i+)/向下逐个熄灭P0=tab38

21、-i;delay(10000);if(state!=4)P0=0xFF;P2=0xFF;return;P0=0xFF;for(i=0;i<9;i+)P2=tab38-i;delay(10000);if(state!=4)P0=0xFF;P2=0xFF;return;P2=0xFF;for(i=0;i<9;i+) /向下逐个点亮P0=tab2i;delay(10000);if(state!=4)P0=0xFF;P2=0xFF;return;for(i=0;i<9;i+)P2=tab2i;delay(10000);if(state!=4)P0=0xFF;P2=0xFF;retur

22、n;for(i=0;i<9;i+) /向上逐个熄灭P2=tab28-i;delay(10000);if(state!=4)P0=0xFF;P2=0xFF;return;P2=0xFF;for(i=0;i<9;i+)P0=tab28-i;delay(10000);if(state!=4)P0=0xFF;P2=0xFF;return;P0=0xFF; void timer0(void)interrupt 1 using 1TL0= 0x00;/重置初值TH0 = 0xBE;TL0 = 0xE5;key=P1;switch(key)case 0xFE:state=1;stateTemp=

23、1;break;case 0xFD:state=2;stateTemp=2;break;case 0xFB:state=3;stateTemp=3;break;case 0xF7:state=4;stateTemp=4;break;default:break;void _int()interrupt 2 using 2 if(flag=0) state=5; flag|=1; else state=stateTemp; flag&=0; void main() IT1=1;IE|=0x86;TMOD= 0x21;TH0 = 0xBE;TL0 = 0xE5;ES = 0;/禁止串口中断T

24、R0 = 1;/开启定时器0，开始定时while(1)switch(state)case 1:fun1();break;case 2:fun2();break;case 3:fun3();break;case 4:fun4();break;case 5:P0=0xFF;P2=0xFF;break;default:break;致 谢在本设计中，遇到了不少的技术问题，凭本人现有的水平是无法解决的，都是通过同学和老师的精心指导，帮我解决了不解之惑，才使我能够顺利的完本钱设计。在此，特别感谢老师以及各位同学在我毕业设计中所做出的指导和帮助。也感谢大学三年来所有的教过我的老师，传授给我专业知识的同时教会

25、了我如何做人。我今天所拥有的专业知识，是他们辛勤耕耘的结果。是他们把我领进了电子信息系统这个专业领域，使我有了前进的方向，将来我还会继续在这一领域进行研究，不管我走多远，你们的教导我始终记在心里。您好，为你提供优秀的毕业论文参考资料，请您删除以下内容，O(_)O谢谢！A large group of tea merchants on camels and horses from Northwest China's Shaanxi province pass through a stop on the ancient Silk Road, Gansu's Zhangye city

26、 during their journey to Kazakhstan, May 5, 2021. The caravan, consisting of more than 100 camels, three horse-drawn carriages and four support vehicles, started the trip from Jingyang county in Shaanxi on Sept 19, 2021. It will pass through Gansu province and Xinjiang Uygur autonomous region, and f

27、inally arrive in Almaty, formerly known as Alma-Ata, the largest city in Kazakhstan, and Dungan in Zhambyl province. The trip will cover about 15,000 kilometers and take the caravan more than one year to complete. The caravan is expected to return to Jingyang in March 2021. Then they will come back,

28、 carrying specialty products from Kazakhstan A small art troupe founded six decades ago has grown into a household name in the Inner Mongolia autonomous region. In the 1950s, Ulan Muqir Art Troupe was created by nine young musicians, who toured remote villages on horses and performed traditional Mon

29、golian music and dances for nomadic families. The 54-year-old was born in Tongliao, in eastern Inner Mongolia and joined the troupe in 1975.He says there are 74 branch troupes across Inner Mongolia and actors give around 100 shows every year to local nomadic people. "I can still recall the days

30、 when I toured with the troupe in the early '80s. We sat on the back of pickup trucks for hours. The sky was blue, and we couldn't help but sing the folk songs," Nasun says. The vastness of Inner Mongolia and the lack of entertainment options for people living there, made their lives lo

31、nely. "The nomadic people were very excited about our visits," Nasun recalls. "We didn't have a formal stage. The audience just sat on the grass. Usually, the performances became a big party with local people joining in." For him, the rewarding part about touring isn't ju

32、st about sharing art with nomadic families but also about gaining inspiration for the music and dance. Ulan Muqir literally translates as "red burgeon", and today's performers of the troupe still tour the region's villages and entertain nomadic families, but their fame has spread a

33、round the world. On May 16 and 17, nearly 100 singers and dancers from the troupe performed at Beijing's Poly Theater. Their show, titled Ulan Muqir on the Grassland, depicted the history and development of the art troupe. "Being from the region allowed me to embrace the culture of Inner Mo

34、ngolia and being a member of the troupe showed me where I belonged," Nasun, the art troupe's president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Sh

35、enyang, capital of Northeast China's Liaoning province, decades ago. The solider gave the old man a handmade saddle when they bid farewell. The story inspired Nasun to write Carved Saddle, a song that later became one of his most popular numbers. Now, every year, Nasun recruits young singers and

36、 dancers for the troupe. The troupe has also designed a new repertoire, which is mostly based on the daily lives of Mongolian people, especially the lives of nomadic families, and has combined contemporary musical elements with folk songs of the region. Haimu, a 25-year-old khoomei (a local variant

37、of overtone singing) singer, joined the troupe three years ago. Along with a six-member band, he performs fast songs and soft ones that he writesall while playing the horse-head fiddle."Although I learned the piano since childhood and grew up listening to various kinds of music, to me, the folk

38、 music of Inner Mongolia is the root," he says. "Performing in remote villages is pleasant. I feel at home on the boundless grasslands, and the warm people there make me feel fulfilled." The first round of spring auction season in Beijing ended last week, but it failed to create much

39、spring in the art market. Although two pieces of Chinese painting fetched more than 100 million yuan, the decline in trading volume and sale rate showed a downturn this year. In the “Grand View: Chinese Painting Highlight session at China Guardian 2021 spring auctions, Pan Tianshous representative w

40、ork Eagle, Rock and Flora hit a record auction price of 279 million yuan, while Li Kerans masterwork Jinggang Mountain fetched 126.5 million yuan, an unexpected high in recent years. However, the trading volume fells to 1.87 billion yuan from 2.22 billion yuan in the same period the year before. The

41、 Huangchen 2021 Spring Auctions, which recorded 42.5 million yuan in total sales, experienced the same. The section number went down to 5 from 12 compared to last year. According to expert Shao Jianwu, the art market did not attract much excitement this year due to the booming stock market and the p

42、ersistent problems of forgery and fake deals. The two pieces of Chinese painting notched up high price this spring due to their own value not due to a revival in the market. "The successful transaction of two works with a hammer price of more than 100 million yuan once again confirms that valua

43、ble and rare works of high quality always earn the long-lasting high price. Chinese painting and calligraphy is still the pillar of the market. However, the overall sales rate has dropped slightly, which reflects the demand for the ordinary auction goods has weakened, said the president of China Gua

44、rdians Hu Yanyan. "Besides, the entry of new buyers also makes certain changes to the direction of purchasing. In a word, the overall market trend is very unpredictable. Although China Guardian 2021 Spring Auctions has achieved remarkable results, it does not mean that the market has walked out

45、 of the predicament. We still have to wait for the big economic boom to invigorate the art market. Even so, the hot pursuit of some special items appeared this spring. A special session of China Guardian Spring Auctions titled “Fine GiltBronze Buddhist Images achieved a great deal with total sales v

46、olume of 41.89 million yuan and 92 percent sale rate. The 5th Shamar Rinpoche Statue from 16-17th century of Tibet was sold for 5.06 million yuan. The Beijing Chengxuan Auctions featured almost 2,800 items of coins and stamps in three sessions with good sale rate. The Huachen Auctions also set a spe

47、cial session of photographs under the condition of large-scale decline of auction sessions. There was a palpable dull thud of disappointment that accompanied the return of the imperial entourage of Zhen Huan to her homeland. It followed a couple years of hushed excitement as Chinese fans were fed ti

48、dbits about their proud concubine who was supposed to conquer the high ground of the North American market. Zhen Huan is, of course, the title character of The Legend of Zhen Huan, a 2021 television series that swept China off its feet and later took other Asian countries by storm. Two years ago, it

49、 was reported that HBO, a premium cable service headquartered in the United States, was going to air it in North America after some modification. Now, a condensed version that provides English subtitles but no dubbing has finally been made available on Netflix for online streaming. This version, hig

50、hly anticipated as a milestone in China's cultural foray overseas, has been widely panned by its home audience. Retitled Empresses in the Palace, the American version has been shortened from its original 76 episodes at 45 minutes each, to six 90-minute episodes. The quick pacing threw off many n

51、ative viewers, who are accustomed to a more leisurely daytime-soap-style narrative rhythm. (Chinese TV stations would run two or three episodes every day.) I did not finish the full-length version and found the truncated one not difficult to follow. What's lost, I believe, are the interesting se

52、tups and pauses that illuminate the Chinese art of storytelling. Much of the plot is still there. It is the flavor that was sacrificed. The American edition uses the framework of the Empress Dowager in her senior years reminiscing at the beginning and the end of each episode, hinting at what's t

53、o come and recapping the key points. This device, not used in the original, is culturally understandable but artistically mediocre. What puzzles me is the two new songs for the opening and end credits. They were written in English, but sung by Chinese with an uncomfortable accent. They were obviousl

54、y designed to appeal to an English-speaking base, but do not jibe with the Chinese dialogue. Speaking of the dialogue, the English translation, picked apart by some Chinese, is too literal for my taste. I can imagine a typical American hit by a flurry of royal ranks, addresses and greetings, even multiple names and titles for the same person. The first half hour must be a swamp to wade through, very much like my experience of getting through a Tolstoy tome with its