隨著網路的普及和無線網路的進步，物聯網技術在生活中逐漸有了許多應用，在各種嵌入式處理器效能的提升，讓物聯網技術有了更多的可能性，然而在大量的物聯網設備的使用，省電的議題趨發重要。
本論文使用被動式感測元件及嵌入式處理器，試圖找出相對省電的門鈴系統。本系統在MCU取值做情態分析後，判斷該狀態且針對該狀態做出相對應的動作。最後MT7688將該狀態的數值上傳並儲存於雲端。使用者透過手機或電腦可以依照不同的方式去得到該情態狀況。

With the popularity of Internet and the progress in wireless network, IOT technology has been applied in many ways in our daily life. With the increase in the efficiency of embedded systems, there are a lot of possibilities in IOT applications. However, it becomes more important to focus on the power-saving issue with a large number of IOT devices used.
In this thesis, we try to find a relatively power-saving doorbell system with using passive sensing elements and embedded system. In this system, we get sensor values to do modal analysis from microcontrollers, it determines the status of the sensor situation and makes the corresponding action for the state. Finally, we upload the values of the state with MT7688 and store in the cloud storage.Users can get the state of the situation in different ways through the phones or computers.

[1]Ayman Ben Thabet ; Nidhal Ben Amor,” Enhanced Smart Doorbell System Based On Face Recognition”, Sciences and Techniques of Automatic Control and Computer Engineering (STA), International Conference on ,pp.373-377,2015
[2]IP Addressing: NAT Configuration Guide
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/15-mt/nat-15-mt-book/iadnat-addr-consv.html
[3]NAT concept-RFC1631
https://www.ietf.org/rfc/rfc1631.txt
[4]Oauth Protocol-RFC6749
https://tools.ietf.org/html/rfc6749
[5]Oauth2.0筆記
https://blog.yorkxin.org/2013/09/30/oauth2-1-introduction
[6]Python 官方網站
https://www.python.org/
[7]LinkIt Smart 7688 Resources
https://docs.labs.mediatek.com/resource/linkit-smart-7688/en
[8]PIR datasheet
https://cdn-learn.adafruit.com/downloads/pdf/pir-passive-infrared-proximity-motion-sensor.pdf
[9]ULN2003 datasheet
http://www.ti.com/lit/ds/symlink/ulq2003a.pdf
[10]28BYJ-48 datasheet
http://robocraft.ru/files/datasheet/28BYJ-48.pdf
[11]Openwrt and LuCI
https://openwrt.org/
[12]Mjpg-streamer
https://github.com/jacksonliam/mjpg-streamer/tree/master/mjpg-streamer-experimental
[13]gspread
https://github.com/burnash/gspread
[14]Andrew Ennis; Ian Cleland; Timothy Patterson; Chris D. Nugent; Federico Cruciani; Cristiano Paggetti; Gareth Morrison; Richard Taylor,” Doorstep: A doorbell security system for the prevention of doorstep crime”, IEEE Engineering in Medicine and Biology Society, 2016 38th Annual International Conference on,pp.5360-5363,2016