【正文】 、應(yīng)急救災(zāi)、感應(yīng)檢測等領(lǐng)域，與社會(huì)生產(chǎn)密不可分。當(dāng)主人離開警戒區(qū)后，按一下開機(jī)鍵，隨一聲 “嘀 ”響，報(bào)警器重處于警戒狀態(tài)。 基于單片機(jī)控制的紅外報(bào)警器設(shè)計(jì) 3 圖 1 DS18B20 引腳分布圖 控制方法 在硬件上， DS18B20 與單片機(jī)的連接有兩種方法，一種是 Vcc 接外部電源， GND 接地， I/O與單片機(jī)的 I/O 線相連；另一種是用寄生電源供電，此時(shí) UDD、 GND 接地， I/O 接單片機(jī) I/O。 第 5 腳： RW 為讀寫信號線，高電平時(shí)進(jìn)行讀操作，低電平時(shí)進(jìn)行寫操作。它由主機(jī)、鍵盤、顯示器等組成（如圖 1 所示）。醫(yī)用紅外線可分為兩類：近紅外線與遠(yuǎn)紅外線。 bit outflag。 基于單片機(jī)控制的紅外報(bào)警器設(shè)計(jì) 9 //DisplayListChar(0,1,str1)。 } void timer1(void) interrupt 3 using 0 { TH1=0x3c。 //initialize Timer0 Init_DS18B20( )。 TR1_flag = 1。s president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Shenyang, capital of Northeast China39。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。t help but sing the folk songs, Nasun says. The vastness of Inner Mongolia and the lack of entertainment options for people living there, made their lives lonely. The nomadic people were very excited about our visits, Nasun recalls. We didn39。 //read temperature display()。//切換顯示 OUT = 0。 } } /***************timer t0 initialization******************/ void init_timer1(void) { TMOD=TMOD|0x12。 uchar ReadOneChar(void)。 基于單片機(jī)控制的紅外報(bào)警器設(shè)計(jì) 7 三、軟件部分 原理圖與程序 原理圖 紅外線報(bào)警器是由單片機(jī)最小系統(tǒng)以及其他元件組成的， 單片機(jī)最 小系統(tǒng)是其中不可缺少的，是其中的核心元件，下面是 紅外線報(bào)警器的原理圖 。 在紅外線報(bào)警器當(dāng)中我們應(yīng)用的單片機(jī)是 stc89c51 單片機(jī)，由它來控制報(bào)警器的運(yùn)行。另外，改變 空比，則可以控制蜂鳴器的聲音大小。 電氣連接 1602液晶屏 采用標(biāo)準(zhǔn)的 16腳接口 ，定義如下表 2所示： 表 2 1602 液晶屏 的引腳定義 注： （ 1） 液晶顯示偏壓信號：是指用于驅(qū)動(dòng) 1602液晶屏 上的像素點(diǎn)改變顏色所用的電壓，此電壓可能接近 GND， 本實(shí)驗(yàn)板所用的 1602液晶是接近 GND。 （ 5） 用戶可分 別設(shè)定各路溫度的上、下限 。 紅外線報(bào)警器對溫度敏感 ,溫度越高的物體輻射出的紅外線越強(qiáng) ,當(dāng)感應(yīng)到環(huán)境中存在高出背景強(qiáng)度的輻射時(shí) ,就觸發(fā)反警?；趩纹瑱C(jī)控制的紅外報(bào)警器設(shè)計(jì) 1 一 、 選題 背景 及類型 背景 現(xiàn)代社會(huì)智能化水平越來越高，給我們的生活帶來了很大便利。而其后的原理，被 2 動(dòng)式報(bào)警器和主動(dòng)式是一樣的。 （ 4） 適配各種單片機(jī)或系統(tǒng)機(jī) 。 下面簡要的說明一下它的電氣連接 。程序中改變單片機(jī) ，就可以調(diào)整控制蜂鳴器音調(diào)，產(chǎn)生各種不同音色、音調(diào)的聲音。究其原因，可能就卡在產(chǎn)品 6 未使用單片機(jī)或其它可編程邏輯器件上。 （ 3）紅外線接收頭 就是在紅外線接收管的基礎(chǔ)上進(jìn)行放大的信號的作用，類似與三極管的放大效果。 void displayfun1(void)。 delay_LCM(1000)。 //停止報(bào)警，進(jìn)入正常模式 TR1_flag = 0。 ReadTemperature()。80s. We sat on the back of pickup trucks for hours. The sky was blue, and we couldn39。s essay affects me very deeply. Not as an urging to bee self reliant – I39。s Liaoning province, decades ago. The solider gave the old man a handmade saddle when they bid farewell. The story inspired Nasun to write Carved Saddle, a song that later became one of his most popular numbers. Now, every year, Nasun recruits young singers and dancers for the troupe. The troupe has also designed a new repertoire, which is mostly based on the daily lives of Mongolian people, especially the lives of nomadic families, and has bined contemporary musical elements with folk songs of the region. Haimu, a 25yearold khoomei (a local variant of overtone singing) singer, joined the troupe three years ago. Along with a sixmember band, he performs fast songs and soft ones that he writes－ all while playing the horsehead fiddle.Although I learned the piano since childhood and grew up listening to various kinds of music, to me, the folk music of Inner Mongolia is the root, he says. Performing in remote villages is pleasant. I feel at home on the boundless grasslands, and the warm people there make me feel fulfilled. The first round of spring auction season in Beijing ended last week, but it failed to create much spring in the art market. Although two pieces of Chinese painting fetched more than 100 million yuan, the decline in trading volume and sa le rate showed a downturn this year. In the ―Grand View: Chinese Painting Highlight‖ session at China Guardian 2021 spring auctions, Pan Tianshou’s representative work Eagle, Rock and Flora hit a record auction price of 279 million yuan, while Li Keran’s masterwork Jinggang Mountain fetched million yuan, an unexpected high in recen