【導(dǎo)讀】掌握基于STC單片機(jī)的直流電機(jī)轉(zhuǎn)速控制以及無(wú)線供電技術(shù)。掌握LED點(diǎn)陣屏信息狀態(tài)控制的基本方法。[3]張明長(zhǎng).基于Atmega16和DS1302的數(shù)碼管時(shí)鐘設(shè)計(jì)[J].北京印刷學(xué)院學(xué)報(bào).[5]胡陽(yáng).基于視覺(jué)暫留的動(dòng)態(tài)掃描LED旋轉(zhuǎn)屏[J].現(xiàn)代電子技術(shù).2020.[7]張玉健.基于nRF24L01的無(wú)線溫濕度檢測(cè)系統(tǒng)設(shè)計(jì)[J].物聯(lián)網(wǎng)技術(shù).并根據(jù)課題性質(zhì)對(duì)學(xué)生提出具體要求。案，成功解決了傳統(tǒng)平面LED顯示屏器件數(shù)量多并且無(wú)法全方位顯示的問(wèn)題。LED燈才能實(shí)現(xiàn)的顯示功能，符合現(xiàn)階段倡導(dǎo)的低碳理念、節(jié)約能源。在國(guó)內(nèi)市場(chǎng)上，國(guó)產(chǎn)LED顯示屏的市場(chǎng)占有率近100%，國(guó)外同類產(chǎn)。品基本沒(méi)有市場(chǎng)，LED所占的市場(chǎng)將會(huì)越來(lái)越大，影響也會(huì)越來(lái)越深遠(yuǎn)。特別是奧運(yùn)盛會(huì)上所應(yīng)用的LED產(chǎn)品。轉(zhuǎn)時(shí)鐘的硬件設(shè)計(jì)與軟件設(shè)計(jì)結(jié)合。

　　

【正文】 科學(xué)版 ). 2020(06) . [3] 張明長(zhǎng) .基于 Atmega16 和 DS1302 的數(shù)碼管時(shí)鐘設(shè)計(jì) [J]. 北京印刷學(xué)院學(xué)報(bào) . 2020(02) . [4] 胡陽(yáng) . RGB POV在點(diǎn)陣旋轉(zhuǎn)屏中的應(yīng)用及其電源解決方案 [J]. 中國(guó)科技信息 . 2020(07) . [5] 胡陽(yáng) . 基于視覺(jué)暫留的動(dòng)態(tài)掃描 LED 旋轉(zhuǎn)屏 [J]. 現(xiàn)代電子技術(shù) . 2020(05) . [6] 魏世秀 ,王翀 . 一種基于單片機(jī)的 RGB LED背光源的設(shè)計(jì) [J]. 現(xiàn)代電子技術(shù) . 2020(04). [7] 張玉健 . 基于 nRF24L01 的無(wú)線溫濕度檢測(cè)系統(tǒng)設(shè)計(jì) [J]. 物聯(lián)網(wǎng)技術(shù) . 2020(01). [8] 曹青梅 ,徐立友 ,曹艷玲 ,席志強(qiáng) . 基于 nRF24L01的移動(dòng)數(shù)據(jù)通訊網(wǎng)絡(luò)設(shè)計(jì) [J]. 微 型機(jī)與應(yīng)用 . 2020(24). 北京交通大學(xué) 2020 屆本科生畢業(yè)設(shè)計(jì)（論文） 23 外文資料 First LED Summary LED (Light Emitting Diode), lightemitting diode, is a solid state semiconductor devices, which can be directly converted into electricity to light. LED is the heart of a semiconductor chip, the chip is attached to one end of a stent, is the negative side, the other end of the power of the cathode, the entire chip package to be epoxy resin. Semiconductor chip is posed of two parts, part of the Ptype semiconductor, it inside the holedominated, the other side is the Ntype semiconductor, here is mainly electronic. When the current through the wires role in this chip, will be pushing eP, P zone in the hole with electronic posite, and then to be issued in the form of photon energy， and this is the principle of LED luminescence. The wavelength of light that is the color of light is formed by the PN junction of the decisions of the material. Second LED history and development 50 years ago, people have to understand semiconductor materials can produce light of the basic knowledge, the first mercial diodes in 1960. English is the LED light emitting diode (LED) acronym, and its basic structure is an electroluminescent semiconductor materials, placed in a wire rack, then sealed with epoxy resin around, that is, solid package, Therefore, the protection of the internal batteries can play the role of line, so the seismic performance LED good. LED is the core of the Ptype semiconductor and ponents of the Ntype semiconductor chips, the Ptype semiconductor and Ntype semiconductor between a transition layer， called the PN junction. In some semiconductor materials in the PN junction, the injection of a small number of carriercarrier and the majority of the extra time will be in the form of light energy to release, thus the power to direct conversion of solar energy. PN junction on reverse voltage, , it is not luminous. This use of injection electroluminescent diodes is produced by the principle of lightemitting diodes, monly known as LED. When it in a positive state of the work (that is, at both ends with forward voltage), the current flows from the LED anode, cathode, semiconductor crystals on the issue from the ultraviolet to infrared light of different colors, light and the strength of the currents. 北京交通大學(xué) 2020 屆本科生畢業(yè)設(shè)計(jì)（論文） 24 Instruments used for the first LED light source instructions, but all kinds of light colored LED lights in traffic and large screen has been widely applied, be good economic and social benefits. The 12inch red traffic lights as an example, is used in the United States have long life, lowefficiency 140 watt incandescent lamp as a light source, it produced 2,000 lumens of white light. The red filter, the loss90 percent, only 200 lumens of red light. In the light of the new design, panies have 18 red LED light source, including the loss of circuit, total power consumption of 14 watts to generate the same optical effect. LED lights is also the source of important areas. For general lighting, people need more white light sources. The 1998 white LED successful development. This is the GAN LED chip and Yttrium Aluminum Gar (YAG) package together cause. GAN chip of the Blueray (λ p = 465nm, Wd = 30nm), made of hightemperature sintering of the Ce3 + YAG phosphors excited by this Blueray after irradiating a yellow, the peak 550 nm. Bluechip installed in the LEDbased reflection in the cavity, covered with a resin mixed with YAG thin layer, about 200500 nm. LEDbased tablets issued by the Bluray absorption part of the phosphor, the phosphor another part of the Blueray and a yellow light mixed, can be a white. Now, the In GAN / YAG white LED, YAG phosphor by changing the chemical position of the phosphor layer and adjust the thickness of the 350010000 K color temperature can be colored white. This blue LED through the method by white, constructed simple, lowcost, high technology is mature, so use the most. The development of LED display can be divided into the following phases: first phase 1990 to 1995, mainly monochrome and 16 color graphics screen. What used to display text and simple images, mainly used in railway stations, financial securities, banks, post offices and other public places, as public information display mean. The second stage is from 1995 to 1999, there have been 64, 256 level grayscale twocolor video screen. Video control technology, image processing, optical fiber munication technology applications will enhance the LED display to a new level. LED display control LSI chips special at this time developed by domestic panies, and can be applied. The third stage, from 1999, red, pure green, blue LED in bulk into China, while domestic enterprises indepth research and development work, using red, green, and blue LED production of fullcolor display has been widely used , poured into sports stadiums, convention centers, squares and other public places, which will 北京交通大學(xué) 2020 屆本科生畢業(yè)設(shè)計(jì)（論文） 25 bring the domestic largescreen fullcolor era. With the rapid development of LED materials market, surface mount device is available from 2020, mainly used in indoor full color, and its high brightness, colorful, low temperature characteristics, the point spacing can be adjusted by different price Requirements were accepted, in just two years time, product sales have more than 300 million