【正文】 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。 無線防盜報警器的設(shè)計與制作 16 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?。?！ A large group of tea merchants on camels and horses from Northwest China39。 （ 2）電路板用萬用表進(jìn)行檢驗(yàn)：查看芯片電源和地管腳是否接錯，電路是否連通，焊點(diǎn)有無虛焊，以防止電路錯誤造成器件燒壞的現(xiàn)象。 無線防盜報警器的設(shè)計與制作 9 單片機(jī) 圖 29 的功能是將接收到的無線信號處理反應(yīng)到發(fā)光二極管和蜂鳴器上。 無線防盜報警器的設(shè)計與制作 8 表 21 NRF905 的工作模式 PWR_UP TRX_CE TX_EN 工作模式 0 X X 關(guān)機(jī)模式 1 0 X 空閑模式 1 1 0 射頻接收模式 1 1 1 射頻發(fā)送模式 NRF905芯片可以選擇多種形式的天線作為無線傳輸?shù)耐緩?。其?腳排列見圖 22。優(yōu)點(diǎn)：本身不發(fā)任何類型的輻射，器件功耗很小，隱蔽性好、探測性能好、易于布防、價格經(jīng)濟(jì)、實(shí)惠被廣泛應(yīng)用。當(dāng)有活動的物體進(jìn)入探測區(qū)域時，接收到發(fā)射回來的超聲波是幅度不等的，并且是不斷變化的，無線防盜報警器的設(shè)計與制作 3 接收電路檢測到變化的信號時控制電路會觸發(fā)外圍報警電路來報警 [5]。 總之防盜報警系統(tǒng)在向多功能、大容量、智能化發(fā)展，越來越成為一套完整的集安全防范、自動化控制等為一體的綜合管理系統(tǒng)體系 [3]。本設(shè)計四路防盜報警器就是基于單片機(jī)設(shè)計開發(fā)的一種實(shí)用性產(chǎn)品。其中安防系統(tǒng)設(shè)備是否完善、可靠將成為評價智能建筑的重要指標(biāo) [4]。當(dāng)有人體在探測區(qū)域內(nèi)走動時，就會造成紅外熱輻射能 量的變化。本設(shè)計選 NRF905 無線收發(fā)模塊來傳輸信息。 圖 26 單片機(jī)模塊 無線發(fā)送模塊 NRF905單片無線收發(fā)器工作于 433/868/915MHz 的 ISM（工業(yè)、科學(xué)和醫(yī)學(xué)）頻道，頻道之間的轉(zhuǎn)換時間小于 650μs。而 CD、 AM、 DR三個管腳分別為載波檢測輸出、地址匹配輸出、數(shù)據(jù)就緒輸出 [12]。再經(jīng) NRF905 接收，單片機(jī)判斷數(shù)據(jù)，將單片機(jī)與蜂鳴器和對應(yīng)的發(fā)光二極管的接口置低，以驅(qū)動蜂鳴器和發(fā)光二極管工作。并且深入了解大 部分市場上的無線防盜報警器的基本結(jié)構(gòu)和工作原理。s Poly Theater. Their show, titled Ulan Muqir on the Grassland, depicted the history and development of the art troupe. Being from the region allowed me to embrace the culture of Inner Mongolia and being a member of the troupe showed me where I belonged, Nasun, the art troupe39。 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. 。s performers of the troupe still tour the region39。 發(fā)射端和接收端可隔墻最遠(yuǎn) 25 米。單片機(jī)主程序流程圖如圖 31。最大發(fā)射功率＋ 10dBm，高抗干擾 GFSK調(diào)制、可跳頻、最大數(shù)據(jù)傳輸數(shù)率 50kbps、獨(dú)特的載波檢測輸出、地址匹配輸出、數(shù)據(jù)就緒輸出。 圖 25 比較電路 無線防盜報警器的設(shè)計與制作 7 單片機(jī)模塊 圖 26 電路主要是將 （與 相連）的按鍵狀態(tài)送到無線發(fā)送模塊發(fā)送。 微波：傳輸距離遠(yuǎn)，穿透能力強(qiáng)，性能優(yōu)越 [9]。 被動式紅外探測器件通過光學(xué)系統(tǒng)的配合作用，它可以探測到某一個立體防范空間內(nèi)的熱輻射的變化。無線防盜報警器的應(yīng)運(yùn)而生使許多的問題迎刃而解。單片機(jī)已在工業(yè)控制、智能儀表、數(shù)控機(jī)床、數(shù)據(jù)采集和處理、通訊及多種智能家電和玩具等眾多方面得到了廣泛應(yīng)用。目前防盜報警產(chǎn)品在我國的普及率只有 20%，與歐美等發(fā)達(dá)國家高達(dá) 70%的普及率相比，我國防盜報警產(chǎn)品市場的發(fā)展才剛剛起步，潛在需求更是難于估計。接收器與發(fā)射器安裝在同一機(jī)殼內(nèi)，用于接收從監(jiān)視內(nèi)反射回來的反射波，并將反射波的頻率與發(fā)射波頻率進(jìn)行比較而作出判斷。被動紅外穿透力差，人體的紅外輻射容易被遮擋，不易被探頭接收。 無線防盜報警器的設(shè)計與制作 6 圖 23 放大電路圖 比較電路 運(yùn)放 LM393是雙電壓比較器集成電路 ，即將一個模擬電壓信號與一個基準(zhǔn)電壓相比較的電路，用來對輸入波形進(jìn)行整形 [11]。本系統(tǒng)采用此種天線解決方案，使用 的是差分環(huán)形天線。 圖 29 單片機(jī)及其周邊電路 發(fā)光二極管 圖 210 單片機(jī)控制四個發(fā)光二極管電路 圖 210 中的接口分別與 STC89C52RC 的 相連接，被單片機(jī)控制來反應(yīng)信號。 （ 4）經(jīng)過觀察，熱釋電紅外感應(yīng)距離只有 20cm，換了反比例放大的電阻來增大放大倍數(shù)，發(fā)現(xiàn)無線發(fā)送不了信息了，但是紅外感應(yīng)距離能夠 達(dá)到 2m。s Zhangye city during their journey to Kazakhstan, May 5, 2021. The caravan, consisting of more than 100 camels, three horsedrawn carriages and four support vehicles, started the trip from Jingyang county in Shaanxi on Sept 19, 2021. It will pass through Gansu province and Xinjiang Uygur autonomous region, and finally arrive in Almaty, formerly known as AlmaAta, the largest city in Kazakhstan, and Dungan in Zhambyl province. The trip will cover about 15,000 kilometers and take the caravan more than one year to plete. The caravan is expected to return to Jingyang in March 2021. Then they will e back, carrying specialty products from Kazakhstan A s mall art troupe founded six decades ago has grown into a household name in the Inner Mongolia autonomous region. In the 1950s, Ulan Muqir Art Troupe was created by nine young musicians, who toured remote villages on horses and performed traditional Mongolian music and dances for nomadic families. The 54yearold was born in Tongliao, in eastern Inner Mongolia and joined the troupe in says there are 74 branch troupes across Inner Mongolia and actors give around 100 shows every year to local nomadic people. I can still recall the days when I toured with the troupe in the early 39。 he wondered how in the world he came to belong there. Indeed his penning and publishing this essay caused his exmuni