【正文】 . I am lucky to have someone who can be both my intimated soul mate and my forever friend. 。s Day on February 14, characterized by bouquets of roses, chocolates and romantic candlelight dinners, than they do about their homegrown day for lovers. Even Qixi is nowadays referred to as the Chinese Valentine39。s misery, the cow told him to turn its hide into a pair of shoes after it died. The magic shoes whisked Niulang, who carried his two children in baskets strung from a shoulder pole, off on a chase after the empress. 臨沂大學(xué) 2021屆本科畢業(yè)設(shè)計 20 The pursuit enraged the empress, who took her hairpin and slashed it across the sky creating the Milky Way which separated husband from wife. But all was not lost as magpies, moved by their love and devotion, formed a bridge across the Milky Way to reunite the family. Even the Jade Emperor was touched, and allowed Niulang and Zhinu to meet once a year on the seventh night of the seventh month. This is how Qixi came to be. The festival can be traced back to the Han Dynasty (206 BCAD 220). Traditionally, people would look up at the sky and find a bright star in the constellation Aquila as well as the star Vega, which are identified as Niulang and Zhinu. The two stars shine on opposite sides of the Milky Way. Customs In bygone days, Qixi was not only a special day for lovers, but also for girls. It is also known as the Begging for Skills Festival or Daughters39。s largest virgin forest, and known for its spring and ecological environment, Arxan is marveled at by many tourists as the purest land on earth. You cannot miss out the Autumn of Arxan. It is definitely the best with brightlycolored scenery full of emotions. Autumn in the northern part of the country es earlier than the South. A September rain followed by the footprints of Autumn brings more colors to the once emerald green mountain and blooming grassland. Shutterbugs flock to see for themselves the marvel of splendid colors around the mountains and waters, many of whom have travel a long distance and even camp here only to capture a moment of the nature wonder. The silver birch turns golden, while the larch is still proudly green. You will find yourself drowned in the intoxicating red of the wild fruits as well as the glamour of flowers in full blown. And your heart will be lingering on the woods as it39。 兩字中間空兩格、四號黑體、居中 臨沂大學(xué) 2021屆本科畢業(yè)設(shè)計 18 為你提供優(yōu)秀的畢業(yè)論文參考資料，請您刪除以下內(nèi)容， O(∩_∩)O 謝謝！?。?2 Many people have the same mixed feelings when planning a trip during Golden Week. With heaps of time, the sevenday Chinese 為你提供優(yōu)秀的畢業(yè)論文設(shè)計參考資料，請您刪除一下內(nèi)容， O(∩_∩)O 謝謝?。?！ National Day holiday could be the best occasion to enjoy a destination. However, it can also be the easiest way to ruin how you feel about a place and you may bee more fatigued after the holiday, due to battling the large crowds. During peak season, a dream about a place can turn to nightmare without careful planning, especially if you travel with children and older people. As most Chinese people will take the holiday to visit domestic tourist destinations, crowds and busy traffic are inevitable at most places. Also to be expected are increasing transport and acmodation prices, with the possibility that there will be no rooms available. It is also mon that you39。 當然我現(xiàn)在的設(shè)計的成功離不開李玉廷老師對我的 悉心教導(dǎo)和指點，以及很多同學(xué)的熱心幫助。 在整個的設(shè)計過程中，我明白了知識的積累不是靠短時間內(nèi)完成的，需要在平時的生活學(xué)習(xí)中認真耐心的去總結(jié)。這是一件令人無比欣慰的事情，在這個過程中我遇到了很多的困難，查閱了很多的資料，以及請教了很多的同學(xué)，所以最后我成功完成了我人生中的第一次畢業(yè)設(shè)計。最重要的是樹立了敢于實踐的思想，以及求知探索的科學(xué)精神，這是我最大的體會和收獲。所以下一步的工作就是工作板的制作和調(diào)整，也就是將硬件電路進行參數(shù)的測量，以達到更加精確的目的。 LED燈采用了紅黃綠三中顏色，色彩對比明顯，易于觀察。再加上搭載的 p0 口可以快站芯片，很大限度的簡化了我的設(shè)計。 單片機有很多類型，我的設(shè)計采用了 89c52 的常用型號。停 YAN0: MOV R0,25 LOOP00:MOV R1,100 LOOP01:DJNZ R1,LOOP01 DJNZ R0,LOOP00 RET YAN1: MOV R0, 20 LOOP10:MOV R1,100 LOOP11:DJNZ R1,LOOP11 DJNZ R0,LOOP10 RET YAN2: MOV R0,30 LOOP20:MOV R1,100 LOOP21:DJNZ R1,LOOP21 DJNZ R0,LOOP20 CHA: DB 03H,06H,05H END 臨沂大學(xué) 2021屆本科畢業(yè)設(shè)計 16 設(shè)計 總 結(jié) 全文從步進電機的結(jié)構(gòu)，工作原理，單片機和步進電機的選擇等方面進行了系統(tǒng)的闡述，對原理理論和概念有了一個系統(tǒng)的分析和街市。加速 MOV R4,0 CJNE R2,0,ZHENG1 LCALL FAN JIAN: MOV R4,1 。加減速正轉(zhuǎn) MOV A,D0 MOVC A,A+DPTR MOV P0,A CJNE R3,0,YIA1 CJNE R4,0,YIA2 CPL CPL CJNE R3,0,YIA1 CJNE R4,0,YIA2 CPL CPL CJNE R3,0,YIA1 CJNE R4,0,YIA2 LJMP ZHENG FAN1: MOV DPTR,CHA 。正轉(zhuǎn) MOV DPTR,CHA MOV A,D0 MOVC A,A+DPTR MOV P0,A ACALL YAN0 CPL CPL ACALL YAN0 CPL CPL ACALL YAN0 LJMP ZHENG FAN: MOV R2,0 。減速 JNB ,TIN 。反轉(zhuǎn) JNB ,JIA 。等待信號 臨沂大學(xué) 2021屆本科畢業(yè)設(shè)計 13 MOV P0,FFH MOV R2,0 MOV R3,0 MOV R4,0 CLR IT0 SETB EA SETB EX0 LJMP MAIN INT0: JNB ,ZHENG。第一步就是要判斷旋轉(zhuǎn)方向，然后向相應(yīng)的控制程序。系統(tǒng)硬件框圖如圖 所示。四相步進電機可以運行在不同模式的電力 ,一個電動模式 (常見的單相繞組 (ABCDA)4? ),雙 (雙相 繞組 (ABBCCDDAAB)4?? )八、