英文翻译基于单片机的LED点阵显示屏的设计

1、衡水学院毕业设计英文文献翻译学生姓名:肖霄系 别:物理与电子信息系专 业:电子信息工程年 级:2008级学 号:200840513043指导教师:郭海丽衡水学院教务处印制原 文题目：LED dot matrix screen design based on MCU As a popular display device component, LED dot-matrix display board consists of several independent LED (Light Emitting Diode). The LED dot-matrix display board can di

2、splay the number or sign, and it is usually used to show time, speed, the state of system etc. This paper introduces a kind of simple 1632 LED display screen design process based on STC89C52 single chip minicomputer . The detail hardware scheme, software flow and C language programmer design and so

3、on is followed. The display part can be cascaded to meet the need. The practice proves the design is low-cost and effective. First of all know of LED dot matrix, the so-called of LED dot matrix is LED to more array in a way device, can be divided into monochrome, double-color, three kinds of color.

4、According to the arrangement of polarity LED into type of Yin and Yang type two kinds. According to the matrix each line or each column contains the number of different LED, and can be divided into 5 x7, 8 x 8, 16 × 16 type etc. One of the LED's pin regular connection, divided into type of

5、Yin and Yang of type 8 x8 LED array. Usually the control including glyph LED control (display what characters) and a control (what a display). In the static display mode, each a display of the form the line is independent, respectively, received a eight I/O mouth, the word a line also connected to a

6、nother I/O mouth. When want to display a character, make corresponding LED light can. Now a lot of billboards would do this. This kind of low cost and easy to implement.Dynamic display of use of or more extensive, dynamic display is a a turn LED light, in every time only a display in the work (light

7、), but because of the human eye for a visual effect and leds extinguishing rays, will appear more characters "and" showing that the phenomenon. That in every moment, all LED to show the same characters will, to each show the different characters, they must use scanning methods in turn LED

8、light you, that in every moment is a particular display character, in this moment, broken choose control I/O ports output corresponding characters chosen code (font code). And a selected control I/O mouth in the displaying a send in electricity flat in order to ensure the corresponding character pos

9、ition shows. So take turns, make each timeshare shows that this position should be display character. For example to show LL0-220, I/O 1 and the I/O 2 take turns into the period of choose code, a selected code and show the state. Choose a code, section choose yards into a delay each 1 ms, because th

10、e person's vision for a time a 100 ms, so each show time intervals not more than 20 ms, and keep the delay for a period of time, to temporarily leave cause visual effect, give a person looks in each LED light, and display different content. LED the array of showing the way according to display d

11、ata coding is the order and a line to display. With high state scanning as an example, if want to show the first line, the first will first line display data (00001000) sent to the LED the array of listed pin, again will "10000000" scanning signals sent to LED the array of line pin, can sh

12、ow the first line, this time the other will not display. Likewise, if you want to show the second line, it will be done to the second display data (00100100) sent to the LED the array of listed pin, again will "01000000" scanning signals sent to LED the array of line pin, can show the seco

13、nd line, this time the other will not show.51 MCU has four I/O interface, often the control equipment many external, when the four interface is not enough to use, often external many expansion of equipment used in connection with external chip, here, of LED dot matrix display cannot directly to the

14、I/O mouth, you need through the expanded chip and 8051 connection.Some of the problems about the font, first have a take font software, it can be one of the Chinese characters and image is decomposed into their respective font, font is the LED screen when displayed by the need to invoke dictionaries

15、, through the modification to revise the word to the content of the show. Take font software has a lot of. You can also download on the net. The software and many functions, transverse take font can undertake right movement, vertical mold can take to move up or down, and so on.How to control the fon

16、t and rolling rolling speed, font is the continuous rolling screen display, then first have to know how to display a screen: a screen (full screen) display is displayed by line, quickly. Make the person produces the visual error, feel the entire screen is in the light. In the show by line, show the

17、one line to delay for a while. Here the delay time to determine the t1 shows the time of each screen, that is the dynamic display of speed). 16 × 16 bitmap screen, for example, the first to perform on display, delay, a total of 16 line shows. Then the 16 line that repeated several times, to bet

18、ter see the screen display. (here several times of the number of times the n1 also decided to display the speed). And change the delay time or the number of repeat t1 that can change the rolling n1 speed, when increase the two value, the scrolling speed will slow down, reducing the when two value, t

19、he scrolling speed can be accelerated. The font displayed by the principle for screen, a font of by how much screen, is how many of the display screen.Since 2000, the LED lawn lamp, traffic light, flashlight, floor lamp, landscape lamp began to enter the market, through the development in recent yea

20、rs, the scale more growth. From the application for the development of the product, the first thing is to put the new application developed. April 2008 in Frankfurt, Germany, in the lighting show on 80 companies using Luxe on function device developed application products. However, thinking about wh

21、at the product development, must play LED itself from aspects of advantages, such as from its long life, moistureproof, bear the vibration characteristics, can develop indoor lighting, museum, safety becon light export symbol lamp, flashlight; From focusing the gender is good, characteristics, can d

22、evelop thin form lamps, small desk lamp, advertising light box, stage lights and coal mine lamp; Low voltage, quick drive from the characteristic, can develop a flashlight, maintenance lamp, buried lights, lawn lamp light and water.Red, pure green, pure blue LED tube pouring into China, while domest

23、ic enterprise further research and development work, use red, green, blue tricolor LED the production of full color displays are widely used, entered the stadium, exhibition center, square and other public places, and the domestic big screen into a full-color era.The present system for using AT89S51

24、 matrix LED display system, the advantage lies in the realization of simple circuit, cost is low. If the system is in need of greater character display library, only need to expand AVR RAM or EEPROM, and with more communication MCU AVR can. Of course, then need to pay attention to data writing time

25、problem, so as to avoid the display of synchronization. 译 文题目：基于单片机的LED点阵显示屏的设计 LED点阵显示屏作为一种新兴的显示器件,是由多个独立的LED发光二极管封装而成. LED点阵显示屏可以显示数字或符号, 通常用来显示时间、速度、系统状态等。文章给出了一种基于STC89C52单片机的16×32 点阵LED显示屏的设计方案。包括系统具体的硬件设计方案,软件流程图和部分C语言程序等方面。在负载范围内, 只需通过简单的级联就可以对显示屏进行扩展,是一种成本低廉的图文显示方案。首先认识LED点阵，所谓LED点阵就是将多

26、个LED以阵列方式排成一个器件，可分为单色、双色、三色三种。依LED的极性排列分为共阳型和共阴型两种类型。根据矩阵每行或每列所含LED个数的不同，又可分为5×7、8×8、16×16等类型。其中的LED的引脚有规律的连接，分为共阳型和共阴型8×8LED阵列。通常LED 的控制包括字形控制（显示什么字符）和位控制（哪些位显示）。在静态显示方式下，每一位显示的字形控制线是独立的，分别接到一个8位I/O口上，字位控制线也连接到另一个I/O口上。当想显示一个字符时，让相应的LED点亮即可。现在很多的广告牌都是这样做的。这种造价低也容易实现。 动态显示用的还是比较广

27、泛的，所谓动态显示就是一位一位的轮流点亮LED，在每一时刻只有一位显示器在工作（点亮），但由于人眼的视觉暂留效应和发光二极管熄灭时的余辉，将出现多个字符“同时”显示的现象。即在每一瞬间，所有LED会显示相同的字符，要想每位显示不同的字符，就必须采用扫描方法轮流点亮各位LED，即在每一瞬间只使某一位显示字符，在此瞬间，断选控制I/O口输出相应字符选码（字型码）。而位选则控制I/O口在该显示位送入选通电平，以保证该位显示相应字符。如此轮流，使每位分时显示该位应显示字符。例如要显示LL0-220时，I/O 1和I/O 2轮流送入段选码、位选码及显示状态。段选码、位选码每送入一次延时1ms,因为人的视

28、觉暂留时间位100ms，所以每位显示的时间间隔不能超过20ms，并保持延时一段时间，以造成视觉暂留效果，给人看上去每个LED都在亮，且显示不同的内容。LED阵列的显示方式就是按显示数据编码的顺序，一行一行地显示。以高态扫描为例，若要显示第一行，则先将第一行的显示数据（00001000）送至LED阵列的列引脚，再将“10000000”扫描信号送至LED阵列的行引脚，即可显示第一行，此时其他行并不显示。同样地，若要显示第二行，则先将第二行的显示数据（00100100）送至LED阵列的列引脚，再将“01000000”扫描信号送至LED阵列的行引脚，即可显示第二行，此时其他行并不显示51单片机有四个I/O接口,经常外接许多的控制设备，当这四个接口不够使用时，经常外接许多扩展芯片用于连接外部的设备，在这里，LED点阵显示屏就不能直接接到I/O口上，就需要通过扩展芯片与8051连接。关于字模的一些问题，首先有一个取字模软件，可以吧一个个的汉字及图像