【正文】 verall market trend is very unpredictable. Although China Guardian 2021 Spring Auctions has achieved remarkable results, it does not mean that the market has walked out of the predicament. We still have to wait for the big economic boom to invigorate the art market.‖ Even so, the hot pursuit of some special items appeared this spring. A special session of China Guardian Spring Auctions titled ―Fine Gilt—Bronze Buddhist Images‖ achieved a great deal with total sales volume of million yuan and 92 percent sale rate. The 5th Shamar Rinpoche Statue from 1617th century of Tibet was sold for million yuan. The Beijing Chengxuan Auctions featured almost 2,800 items of coins and stamps in three sessions with good sale rate. The Huachen Auctions also set a special session of photographs under the condition of largescale decline of auction sessions. There was a palpable dull thud of disappointment that acpanied the return of the imperial entourage of Zhen Huan to her homeland. It followed a couple years of hushed excitement as Chinese fans were fed tidbits about their proud concubine who was supposed to conquer the high ground of the North American market. Zhen Huan is, of course, the title character of The Legend of Zhen Huan, a 2021 television series that swept China off its feet and later took other Asian countries by storm. Two years ago, it was reported that HBO, a premium cable service headquartered in the United States, was going to air it in North America after some modification. Now, a condensed version that provides English subtitles but no dubbing has finally been made available on Netflix for online streaming. This version, highly anticipated as a milestone in China39。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。s performers of the troupe still tour the region39。t have a formal stage. The audience just sat on the grass. Usually, the performances became a big party with local people joining in. For him, the rewarding part about touring isn39。80s. We sat on the back of pickup trucks for hours. The sky was blue, and we couldn39。s Shaanxi province pass through a stop on the ancient Silk Road, Gansu39。 （ 3）在無線發(fā)送接收方面可利用 NRF905 的全雙工功能，現(xiàn)在是發(fā)射端到接收端，增加發(fā)射端和接收端的功能，實現(xiàn)由接收端對發(fā)射端的控制。 進一步工作展望 由于時間和 本人 學識有限，許多方面的 部分 還沒有進一步展開，課題中出現(xiàn)的一些問題還需要進一步的研究和解決： （ 1）熱釋電紅外感應(yīng)器的可測距離和范圍有些小，如果能使范圍和距離大點，將會更適合現(xiàn)實生活中的應(yīng)用。 參考了一些無線防盜報警器的設(shè)計，清楚掌握了無線接收模塊和單片機的程序如何編寫。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。 發(fā)射端和接收端可隔墻最遠 25 米。 運行結(jié)果 當有人靠近時，發(fā)射端二極管閃爍，當發(fā)射端撥碼開關(guān)哪個打 on時，接收端對應(yīng)哪個燈亮，并蜂鳴器鳴叫。通過示波器觀察單片機 ALE 波形，發(fā)現(xiàn)單片機正常工作，沒有燒掉。 （ 3）初步檢驗發(fā)現(xiàn)熱釋電傳感器的 G、 D 管腳接反了，有些地方虛焊導致電路不通，經(jīng)過改正后接通電源，電路正常工作，無線發(fā)送接收正常，現(xiàn)象與預(yù)期結(jié)果相同。 NO NO YES NO YES NO YES YES NO 圖 33 NRF905無線模塊接收程序流程圖 空閑模式 TX＿ EN=0 PWR＿ UP=1 接收設(shè)備通電 AM 置 1 接收數(shù)據(jù) DR 置 1 進入空閑模式 DR 和 AM 置 0 地址匹配 ? 啟動 NRF905 接收模式 檢測到同一頻段載波，CD 置 1 AM 置 0 微控制器通過 SPI接口獲取數(shù)據(jù) TRX＿ CE=1? CRC 正確 ? TRX＿ CE=1? 無線防盜報警器的設(shè)計與制作 14 第四章 系統(tǒng)的調(diào)試及 運行結(jié)果 系統(tǒng)的調(diào)試 （ 1）先將系統(tǒng)程序進行編譯，在確認無誤后將程序燒錄到 STC89C52RC 中。 NO YES NO YES NO YES NO NO YES 圖 32 NRF905無線模塊發(fā)送程序流程圖 無線接收流程 圖 33 介紹了 NRF905 無線模塊接收信息流程： 空閑模式 TX＿ EN=1 PWR＿ UP=1 TRX＿ CE=0 SPI 編程 由微控制器向 NRF905發(fā)送數(shù)據(jù)包 啟動 NRF905 發(fā)送模式 加字頭和 CRC 校驗碼 發(fā)送數(shù)據(jù)包 TRX＿ CE=1? TRX＿ CE=1? AUTO＿ RETRAN=1? DR=1? 發(fā)送設(shè)備通電 無線防盜報警器的設(shè)計與制作 13 A．當 TRX_CE 為高、 TX_EN為低時， NRF905 進入接收模式； 650μs后， NRF905 不斷監(jiān)測，等待接收數(shù)據(jù)；當 NRF905 檢測到同一頻段的載波時，載波檢測引