摘 要:近年來針對筆記本等個人貴重物品被盜時有發生這一現狀,設計出一種基于加速度傳感器的低功耗無線防盜器。提出僅通過2個節點構建成最簡單的無線傳感器網絡,傳遞PC移動信息,通知主人迅速做出反應,避免筆記本的丟失。通過硬件電路設計和軟件編程燒寫使整個網絡得以驅動,并通過實驗測驗達到了預期的報警效果。解決了一般防盜器價格昂貴,系統復雜,體積較大,時延較長的缺點。關鍵詞:無線傳感器網絡; 加速度傳感器; 防盜器
中圖分類號:TN911-34; TP393 文獻標識碼:A
文章編號:1004-373X(2010)16-0175-03
Application of Sensors in Anti-theft Device for Notebook Computers
YU Yong-hui, ZOU Tao, DING Ying
(Engineering College of Armed Police Force, Xi’an 710086, China)
Abstract: A low-power wireless anti-theft device based on acceleration sensors is designed to prevent the notebook computers and other personal valuables from being stolen from time to time.Themoving message of PC is transmitted by the most simple wireless sensor networks which are built just with two nodes to notify the owner to respond quickly to avoid the loss of laptops. The whole network is driven through the hardware circuit designand software programming. The experimental testing shows that it can satisfy the alarm expected result. The shortcomings of high price, complex structure, large volume and long time delay of general anti-theft devices were overcome. The innovation point is the concept of \"use with building\".
Keywords: wireless sensor network; acceleration sensor; anti-theft device
0 引 言
隨著社會經濟的不斷發展,筆記本日益普及,隨之帶來的PC安全防盜問題也日漸顯著。在有些場合隨身攜帶筆記本很不方便,例如在乘火車旅行中,當主人去洗手間,此時如何防止、杜絕小偷盜走筆記本是個亟待解決的問題。如今應用廣泛的汽車防盜技術已很成熟,但相對成本較高,且無需考慮電源問題,而PC防盜就必須解決這些問題;還要體積小,能隨時安裝在PC上。在此,提出僅使用2個基于SimpliciTI通信協議[1]的節點(帶有加速度傳感器)進行點對點通信,完成防盜功能。
1 總體方案
系統設計方案非常簡單。一般來講火車車廂全長26.6 m,而無線傳感器網絡[2-3](wireless sensor networks,WSN)的通信距離在幾十米到幾百米之間,一般為30 m,因此一個節點就可以完全覆蓋整個車廂。在系統中只有2個節點(不需PC協助):節點1作為發信者,節點2作為收信者,組成最簡單的網絡,不需跳轉。系統的結構簡單,使得傳輸時延非常小,比較適合應用在上文中提到的場合。……