【正文】 s Day. More and more young Chinese people begin to celebrate this day in a very similar way as that in western countries. Fewer people than ever will gaze at the heavens on Saturday to pick out the two stars shining bright on either side of the Milky Way, that is, if people even know on which day Qixi falls. There are ready reminders dotted about, in the form of big ads saying Sales on Chinese Valentine39。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 17 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。============================================ TIMER:MOV TL0, 0F0H MOV TH0, 0EFH MOV A, R1 MOVC A, A+DPTR MOV P1, R3 MOV P2, A MOV A, R3 ADD A, 20H MOV R3, A INC R1 CJNE R1, 70H, OUT MOV R3, 8FH MOV R1, 6CH OUT: RETI 。INT0 LJMP TIMER ORG 0030H START: MOV SP, 75H MOV R1, 6CH MOV R3, 8FH MOV P2, 0FFH MOV DPTR, LEDTAB MOV P3, 0 MOV TMOD,01H MOV TL0, 0F0H MOV TH0, 0EFH SETB EA SETB ET0 SETB TR0 MOV 6CH, 5 MOV 6DH, 5 MOV 6EH, 5 MOV 6FH, 5 。 9 先對要用到的存儲單元， I/O 口，寄存器進行相應(yīng)的設(shè)置，然后主程序?qū)λ膫€端口 、 、 、 進行循環(huán)檢測，當檢測到有效信號時，則對相應(yīng)存儲單元賦值，然后繼續(xù)其他端口檢測，定時時間到時，對四個存儲單元內(nèi)的數(shù)據(jù)進行輸出顯示，報警也響起；當主程序檢測到 為高電平時，則終止報警，同時存儲單元再次初始化，繼續(xù)循環(huán)檢測，重復相同“動作”。同時在 口的作用下，報警器響起。 74HC138的 A、 B、 C 與單片機的 、 、 相連通，我們可以通過程序控制 、 、 38 譯碼器的輸出，從而達到選位的目的。 6 LED 信息顯示模塊 本設(shè)計選用 4 位共陽極數(shù)碼管作為顯示模塊。低功耗空閑和掉電模式 AT89C52 功能特性概述 AT89C52 提供以下標準功能： 8k 字節(jié) Flash 閃速存儲器， 256 字節(jié)內(nèi)部RAM ， 32 個 I / O 口線， 3 個 16 位定時／計數(shù)器，一個 6 向量兩級中斷結(jié)構(gòu)，一個全雙工串行通信口，片內(nèi)振蕩器及時鐘電路。 32 個可編程 I / O 口線 1000 次擦寫周期 其原理圖如圖 ： 圖 紅外對射型液位傳感器原理圖 AT89C52 概述 AT89C52 是美國 ATMEL 公司生產(chǎn)的低電壓，高性能 CMOS 8 位 單片機，片內(nèi)含 8kbytes 的可反 復擦寫的 只讀程序存儲器（ PEROM ）和 256 bytes 的隨機取數(shù)據(jù)存儲器（ RAM )，器件采用 ATMEL 公司的高密度、非易失性 存儲技術(shù)生產(chǎn)，與標準 MCS 一 51 指令系統(tǒng)及 8052 產(chǎn)品引腳兼容，片內(nèi)置通用 8 位中央處理器（ CPU）和 Flash 存儲單元，功能強大 AT89C52 單片機適應(yīng)于許多高性價比的應(yīng)用場合。 監(jiān)測模塊 本模塊采用的是紅外對射型余液液位傳感器。對于方案二而言，成本低，最重要的是安裝上方便，醫(yī)護人員可根據(jù)點滴瓶的大小，在安裝時進行調(diào)整。系統(tǒng)將復位，等待其他的床位監(jiān)測信息。整個系統(tǒng)工作 前，先將傳感器裝于點滴瓶“警戒”液位水平處。安裝于被監(jiān)測對象上的超聲液位傳感器，將實時監(jiān)測數(shù)據(jù)經(jīng) A/D 轉(zhuǎn)換，送入單片機連接 I/O 口。 2 2 總體方案設(shè)計 本次設(shè)計思想主要是想借助單片機，對 醫(yī)療點滴輸液 加以半自動化的 控制 。 目前醫(yī)院普遍使用的是人工監(jiān)控點滴輸液裝置器，將液體容器掛在一定高度，利用勢差將液體輸入病人體內(nèi)，用軟管夾對軟管夾緊和放松控制滴速，藥物的有無將威脅病人的生命安全，為此 醫(yī)護人員 要不定時的觀察藥物的情況，本設(shè)計 根據(jù)需要設(shè)定液位控制高度，同時具備報警、高度顯示等功能，使用了紅外對射 傳感器，使其具有與液面不接觸的特點，可用于有毒、腐蝕性液體液位的控制， 簡單、方便、安全、 具有較高的 使用 價值。 7 總結(jié)和體會 ....................................錯誤 !未定義書簽。 8 參考文獻 ......................................錯誤 !未定義書簽。如何使這種手工操作走向自動化或半自動化， 讓護理人員監(jiān)控病人打點滴的進程時間得到充分利用，這就要求醫(yī)療器械加速自動化與半自