【導讀】彩燈顯示電路組成，利用軟件編程燒錄程序到單片機來實現(xiàn)對LED彩燈進行多樣控制。能完成多種閃燈模式以及隨意變換想要的閃爍方式和控制彩燈的閃爍頻率等功能。結構簡單、易操作、硬件少、體積少、成本低、能耗低等優(yōu)點，有一定的實用價值。也可用兩非門與電阻與電容構成多諧振蕩器加到計數(shù)器來完成。口接16個二極管，P3口接擴展板的數(shù)碼顯示接口。該方案簡單，易于設計和控制，所以選擇法案三。要使單片機工作起來，最基本的電路構成由單片機、時鐘電路、復位電路等組成。單片機最小系統(tǒng)由復位電路和時鐘信號電路組成。時鐘電路由一個晶振和兩個小電容組。AT89C51單片機芯片內部有一個反向放大器構成的振蕩器，XTAL1. 亮度隨流過的電流增加而增加，但電流過大LED的壽命也將縮短。電流，而在輸出低電平時，I/O最大可以輸入幾十毫安的電流。的方式，即電流從電源經(jīng)LED流向I/O口。為了不讓流過LED的電流太大而把它燒壞，

　　

【正文】 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 what39。s to e 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 unfortable accent. They were obviously designed to appeal to an Englishspeaking 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 ?？诮?jīng)濟學院信息工程學院 21 Tolstoy tome with its endless inflections of names transliterated into lengthy Chinese. I see the choice of verbatim translation as an effort for conveying exotica. It is fairly petent, with no error that I could detect, but fails to rise above words or capture the essence of the language. A cultural product usually crosses over to a foreign territory first by an emphasis on the monalities. But whether inside or outside China, the temptation to sell it for the differences is just too great. Sure, the sumptuous sets and costumes are a big attraction, but the narrative technique has bee－ how shall I put it?－ a bit anglicized, which is necessary for cultural export. Judging by the responses, this legend, which, contrary to the claim of the English trailer, is totally fictitious, has departed from China but not yet landed on American shores. I am a big fan of Ralph Waldo Emerson39。s essay titled SelfReliance. If you39。ve not yet read it, I strongly encourage you to do so. In this essay, the venerable Emerson talks about eschewing the trappings of society and finding one39。s own path. He urges the reader to find rectitude and lead a moral life. He professes that, only by being self reliant, as opposed to relying on the government and being dictated to by society, can one begin leading a decent and purposeful life. He avers that such a life is the only life worth living. I agree with him. This essay was written during a time of social upheaval in America, and it is rather odd that Emerson authored it, as he was a part of the upper crust of society at the time. It just so happened that he looked around him, at the indolence and the wantonness of the people in his circle。 he wondered how in the world he came to belong there. Indeed his penning and publishing this essay caused his exmunication from high society and also caused him a lot of legal trouble. The legal trouble came as a result of the fact that he was speaking out against the government. I like to reference such texts from time to time as an example both of the fact that history does repeat itself and that this world is not so big that what applies to one society does not in any way touch another society. On a much smaller scale,Emerson39。s essay affects me very deeply. Not as an urging to bee self reliant – I39。m nothing if not that! In his text he expounds on the idea that one must give their life a purpose. And that is the true topic of this entry. These last four years have been so easy: teach for a grand total of six hours a week, and the rest of my time is mine. Since I39。ve been here I have been tasked with nothing more challenging than learning my students39。 names and figuring out what to do with them for the brief time each week that I stand in front of them. I do not consider the challenges of learning to live here part of a purposeful life. I consider those issues existential in nature. One of the problems with my life in America was that I felt it had no purpose. I went to work every day and even did what I could to make my colleagues39。 work lives easier, but I simply could not digest the fact that that was my sole purpose in life. With no family to support, I was the sole beneficiary of my employment: the paycheck, the benefits, the incentives and the rewards were mine alone. Not much of a purpose in being selfserving, is there? While I was a student, I felt I was leading a purposeful life. Learning new things, broadening my horizons, expanding my life experiences all gave my life a zip and drive that I had not felt since being in survival mode when my kids were small. After graduating college I felt oddly deflated… but by then, China was on my horizon.