一般上，使用者若要在家裡安裝防盜系統都得跟防盜系統公司購買硬體設備，
公司會派出員工到使用者的家裡安裝設備。市面上的防盜系統選擇眾多，不同的
家居安全防護，其價格也會隨著安全防護等級的提高而更加昂貴，無形中造成使
用者負擔更多的開銷與費用。這些防盜設備都具有一些特定的感應器或者鏡頭，
當偵測到有異樣的行為之後，防盜系統就會提供訊息通知或者監視和錄影的功能
給予使用者。
　　隨著智慧型手機越來越普及，智慧型手機的價位也越來越便宜。尤其智
慧型手機已經內嵌許多感應器，例如光源感應器，方向感應器，和加速度感應器
等等。故本研究透過智慧型手機的感應器，設計一個防盜系統的應用程式稱為
DoorPass。透過掛在門的後方，偵測是否有開門的行為，並進行相關的保護措施。
我們提供三種通知方式分別是傳簡訊，打電話，和寄email 給予使用者。除此之
外，我們也提供三種保護功能分別是手機追踪功能，錄影功能，和臉部偵測功能。
透過實做在智慧型手機，不僅可以做到防盜的功能，而且可以降低成本，提供方
便，簡單，和安全的防護措施。

Normally, there is an only way to buy the security devices from the company of security system (anti-theft system), if user who wants to have a security system in his/her house. Then, the company will send their employee to the user’s house for installing the hardware devices. Moreover, there are lots of securities systems available on the market, the cost of security system will increase according to the protection level which select by the user and this will increase the burden on the user. Generally, these kinds of security devices would have some specific sensors and camera. The security system would send notifications or provide monitoring function to the user when the security devices have detected some abnormal situation.

Recently, the smartphone devices have become the one of the most popular production in the whole world and the price of smartphone have become cheaper and cheaper. Especially, most of the smartphones have embedded lots of sensors such as light sensor, orientation sensor, accelerometer sensor, etc. Thus, our research is implemented a security application called DoorPass which based on smartphone device sensors. By placing the smartphone behind the door, DoorPass can detect the door movement, and provide some protection to the user. We provided three kinds of notification which are sending sms, make a phone call, and send email. Besides, we also provide three different functions for protection which are track phone, video record, and face detection. By implementing on the smartphone, DoorPass not only can provide the protection but also lower down the cost fee of buying the security hardware and provided convenient, simple and security functions.

Table of Contents i
List of Figures iii
List of Tables iv
1 Introduction 1
1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Background 3
2.1 Motion Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1 Accelerometer Sensor . . . . . . . . . . . . . . . . . . . . . . . 4
2.1.2 Orientation Sensor . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Android Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Related work 9
4 System Design 11
4.1 Design Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Overview of DoorPass . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.1 Notifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.2 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5 Implementation 18
5.1 Observed Pattern of Sensors Reading . . . . . . . . . . . . . . . . . . 18
5.1.1 Orientation Sensor . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1.2 Accelerometer Sensor . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 The Structure of Android Application . . . . . . . . . . . . . . . . . 21
5.3 DoorPass on Android . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.4 The Process of Using DoorPass . . . . . . . . . . . . . . . . . . . . . 24
6 Evaluation and Limitation 27
6.1 Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1.1 Hardware Preparation . . . . . . . . . . . . . . . . . . . . . . 27
6.1.2 Scenario test . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.1.3 Experiment results . . . . . . . . . . . . . . . . . . . . . . . . 31
6.2 Limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7 Conclusion 37
7.1 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.2 Future work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

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