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本科畢業(yè)論文-基于at89c52單片機(jī)的公交車語音報站及漢字顯示系統(tǒng)設(shè)計(jì)(參考版)

2025-06-07 16:34本頁面
  

【正文】 s time for the wild fruits to ripe. The picturesque Arxan in Autumn is indeed a fairyland only exists in a dream that satisfies all your fantasies. If it rains heavily on Saturday night, some elderly Chinese will say it is because Zhinu, or the Weaving Maid, is crying on the day she met her husband Niulang, or the Cowherd, on the Milky Way. Most Chinese remember being told this romantic tragedy when they were children on Qixi, or the Seventh Night Festival, which falls on the seventh day of the seventh lunar month, which is usually in early August. This year it falls on Saturday, August 2. Folklore Story As the story goes, once there was a cowherd, Niulang, who lived with his elder brother and sisterinlaw. But she disliked and abused him, and the boy was forced to leave home with only an old cow for pany. The cow, however, was a former god who had violated imperial rules and was sent to earth in bovine form. One day the cow led Niulang to a lake where fairies took a bath on earth. Among them was Zhinu, the most beautiful fairy and a skilled seamstress. The two fell in love at first sight and were soon married. They had a son and daughter and their happy life was held up as an example for hundreds of years in China. Yet in the eyes of the Jade Emperor, the Supreme Deity in Taoism, marriage between a mortal and fairy was strictly forbidden. He ordered the heaven troop to catch Zhinu back. Niulang grew desperate when he discovered Zhinu had been taken back to heaven. Driven by Niulang39。 ll wait in the line for one hour to get a ticket, and another two hours at the site, to only see a tiny bit of the place due to the crowds. Last year, 428 million tourists traveled in China over the weeklong holiday in October. Traveling during this period is a matter that needs thorough preparation. If you are short on time to plan the uping Golden Week it may not be a bad idea to avoid some of the most crowded places for now. There is always a place so fascinating that everyone yearns for. Arxan is a place like this. The beauty of Arxan is everlasting regardless of the changing of four seasons. Bestowed by nature, its spectacular seasonal landscape and mountains are just beyond word. Arxan is a crucial destination for the remended travelling route, China Inner Mongolia Arxan — Hailar — Manzhouli. It is also the joint of the four prairies across the SinoMongolian border, where people gravitate towards the exotic atmosphere mixed with Chinese, Russian, and Mongolia elements. As a historic site for the Yitian Battle, Arxan still embodies the spirit of Genghis Khan. Walking into Arxan, you will be amazed by a kaleidoscope of geous colors all the year round the Spring azaleas blooming red in the snow, the Summer sea wavering blue in the breeze, the Autumn leaves painted in yellow covering volcanic traces, and the Winter woods shining white on the vast alpine snowscape. Hinggan League Arxan city is situated in the far eastern area of Inner Mongolia Autonomous Region. Its full name Haren Arxan means hot holy 25 water in the Mongolian language. Arxan is a tourism city in the northern frontier with a blend of large forest, grand prairies, vast snowfield, heaven lake cluster, thermium, as well as volcanic cluster. It is a rare and unique ecotourism base filled with healthy sunshine, clean air and unspoiled green. Nestled close to the country39。讓我們向著美好的為好的未來努力。 對于此次設(shè)計(jì),看到了這一設(shè)計(jì)給我們的生活帶來的方便,作為一個即將踏入社會的新青年,此設(shè)計(jì)在技術(shù)都成熟之后更能通過 GPS 定位加以運(yùn)用,和手機(jī)鏈接,實(shí)現(xiàn)智能公交實(shí)現(xiàn)無論你在哪個城市,哪個位置,你都可以了解到附近的公交狀況,不必為出行擔(dān)心。對于這次課題是肖老師給我們講解之后知道從哪里下手,從網(wǎng)上搜集大量資料,慢慢的發(fā)現(xiàn)很簡單,也很感謝身邊的同學(xué)給與的幫助。 開 始計(jì) 算 顯 示 R A M 地 址文 本 顯 示 區(qū) 首 地 址設(shè) 置 顯 示 R A M 地 址取 漢 字 代 碼寫 入 漢 字 代 碼結(jié) 束 圖 44 LED 顯示流程圖 22 五、總結(jié) 經(jīng)過一個月的努力設(shè)計(jì)的課題即將完成,滿懷激情,在自己的努力下實(shí)現(xiàn)了報站器的功能,也通過這次設(shè)計(jì)對 52 單片機(jī)、語音芯片 ISD1703 及顯示器 LED 加深了理解和認(rèn)識。 開 始執(zhí) 行 上 電 操 作 指 令( P O W E R U P )延 遲 等 待 ( 2 5 m s ) 直 到 上 電 結(jié) 束上 電 延 遲 時 間 到 ?執(zhí) 行 S E T P L A Y 命 令設(shè) 置 播 放 地 址執(zhí) 行 P L A Y 命 令 I N T 有 效 ?繼 續(xù) 播 放 下 一 段 ?執(zhí) 行 S T O P W R D N 命 令 段 間 延 遲結(jié) 束NYYNNY 圖 43 放音程序流程圖 21 LED 顯示流程圖 當(dāng)有按鍵指令觸發(fā)電路時,在語音播報的同時執(zhí)行 LED 顯示到站的信息。 開 始執(zhí) 行 上 電 操 作 命 令直 到 上 電 結(jié) 束上 電 延 遲 時 間 到上 電 時 間 到執(zhí) 行命 令設(shè) 置 錄 音 地 址執(zhí) 行R E C 命令 I N T 有 效 或錄 音 時 間 到執(zhí) 行 S T O P W R D N命 令結(jié) 束YNN YYN 延 遲 二 倍 上 電 時 間執(zhí) 行 上 電 操 作 命 令 圖 42 錄音程序流程圖 20 放音程序流程圖 對語音芯片的放音,由單片機(jī)控制放音的時間,當(dāng)有觸發(fā)時單片機(jī)發(fā)出指令放音。 開 始液 晶 , 語 音芯 片 初 始 化是 否 有 按 鍵 按 下 ?沒 有 按 鍵 1按 下有 按 鍵 1 按下語 音 模 塊 開 始 報站 、 同 時 顯 示 模 塊開 始 顯 示 到 站 信 息結(jié) 束 圖 41 主程序流程圖 19 錄音程序流程圖 對語音芯片的錄音開始執(zhí)行上電操作,然后開始錄音到結(jié)束每一次錄入站點(diǎn)信息都必須有按鍵觸發(fā),并設(shè)置錄音地址執(zhí)行 REC 命令。如果沒有觸發(fā)則不報站。 圖 38 穩(wěn)壓電路 圖中采用的穩(wěn)壓元件 LM2576 式開關(guān)穩(wěn)壓集成芯片,具有 較高的工作性能能,較強(qiáng)的電流驅(qū)動能力,性能可靠,更有效的確保單片機(jī)的穩(wěn)定運(yùn)行, .同時由于個芯片所需的電壓不同,語音芯片需要 3V 而液晶顯示部分電壓是 或 5V 而穩(wěn)壓電路的電壓是 24V,所以需要利用串聯(lián)電阻來分壓。在相同壓降的條件下,開關(guān)電源調(diào)節(jié)器件與線性穩(wěn)壓器件相比熱損失小很多?,F(xiàn)有技術(shù)下我們考慮到開關(guān)電源,和線性電源,兩者作比較,線性電源在工作中功耗比較大,并且不穩(wěn)定,會造成系統(tǒng)的穩(wěn)定性變差,這樣不利于電路的長期使用。 LED 電路圖見附圖,框圖如圖 37 所示。對列數(shù)據(jù)準(zhǔn)備 ,它應(yīng)該 能夠?qū)崿F(xiàn)字符串的位移函數(shù) ,對列數(shù)據(jù)顯示 ,應(yīng)該并行鎖的功能。為了達(dá)到重疊處理的目的, 列數(shù)據(jù)顯示具有鎖定功能是必要的。 顯示電路 設(shè)計(jì)采用以 AT89C51單片機(jī)為核心芯片 ,16*16LED 漢字顯示 4個字,即為 16*64點(diǎn)陣漢字顯示,采用重疊處理的方法。消除自激,減小對外雜散電磁輻射,提高 EMI 電磁兼容性。為避免此,在每個 74HC595 的電源 VCC 和 GND 旁邊都并聯(lián)了兩個電容,用于濾波和退耦。這種電壓波動有高頻成分,也有低頻成分。使紅綠兩組 LED 均能正常發(fā)光。這樣就可以容納較大的傳輸線對地電容,使本設(shè)計(jì)的抗干擾能力增強(qiáng)。這個特點(diǎn)保證了不用增加額外的擴(kuò)流電路即可輕松的驅(qū)動 LED。增強(qiáng)了單片機(jī)控制外設(shè)的能力。 LED 驅(qū)動原理 1.行驅(qū)動芯片 74LS154 4 線 — 16 線譯碼器 ,74HC154 是此集成電路的 s 版本,其功耗更小,功能一樣。在維持時間恒定的情況下,電流越大(不超過額定電流),點(diǎn)陣亮度也越亮,而在電流恒定的情況下,需要一段維持時間來保持亮度。然后在反復(fù)掃描這 16 行直至顯示新的信息。 本 LED 點(diǎn)陣屏采用動態(tài)掃描的方式顯示,即逐行掃描,工作時先
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