EcoMini: 微小型藍芽低功耗動作感測節點

EcoMini: Low-Power, Miniature Bluetooth Low Energy Motion Sensor Node

許亨百(Hsu, Hen Pai)

指導教授 ： 周百祥

國立清華大學/電機資訊學院/資訊工程學系/碩士(2015年)

https://doi.org/10.6843/NTHU.2015.00375

摘要

物聯網的興起帶動了一類新的嵌入式系統, 綜合了短距離低功耗無線通訊技術與鄰近感測、 慣性感測、與時鐘日曆晶片(RTC) 整合成微型電路板。 這樣的系統在收集使用情景資訊時可 以相當實用,包括使用者行為、手式、 使用者所在地點、方向、動作、與其他使用者或物件 相遇、以及時間。 使用者的情景的資訊,將會是一大關鍵技術, 使得普及的電子系統能夠 真正地提升到智慧型的行為。 但是目前很少合乎所有需要功能的嵌入式系統平台。
在本論文內,我們介紹一個新的無線動作感測節點,叫做EcoMini, 是一個微小的12 mm × 9 mm 的電路板,上面有 時鐘、藍芽低功耗(BLE)收發訊器。 使用的是單晶片架構,也就 是同一微處理器包含了BLE通訊堆疊與應用程式層的軟體。 BLE通訊協定的優勢是,可以直 接與智慧型手機與個人電腦通訊,不需經過 轉接收發器或閘道器。九軸慣性感測器包含了一 個數位三軸加速規、 三軸陀螺儀同時整合在單一封裝內,除了感測功能之外,也能靠動作驅 動有效的耗能管理。 本系統的貢獻包括了設計上在功耗、尺寸、與擴充性之間達到了平衡。 此系統已容易地被應用於數個物聯網應用上,有效地實作出嵌入式系統的部份, 包括以動作 驅動的鄰近標籤、空中滑鼠、智慧拖鞋、以及認人廚櫃門。

關鍵字

藍芽 ； 低功耗 ； 感測網路 ； 節點

並列摘要

The advent of the Internet of Things (IoT) has given rise to a new class of embedded systems that combine short-range, low-power wireless communication with proximity sensing, inertial sensing, and real-time clock (RTC) in a miniature package. Such a system can be very useful in collecting contextual information for its user, including user behavior or gesture, user location, orientation, and motion, user encounter with other users or objects, and time. Such context can be crucial in making pervasive electronic systems behave in a truly intelligent way. Unfortunately, there have been few platforms to date that can provide all the necessary features.
In this thesis, we present EcoMini, a new wireless motion-sensing node with RTC and Bluetooth Low Energy (BLE) radio transceiver, all in a miniature size of 12 mm × 9 mm. It uses the same programmable microcontroller unit (MCU) for both the BLE protocol stack and application code. BLE enables direct connectivity to smartmobiles and PC/Mac computers without the inconvenience of a dongle or gateway. The 9 degree-of-freedom (9-DoF) inertial sensor includes a digital triaxial accelerometer, a gyroscope, and a compass in one package. Its threshold detection feature enables effective motion-based power management. The contributions include a balance between power, size, and expandability. This system has been used for easy, efficient implementation of several IoT devices, including a motion-enabled proximity tag, an air-mouse, smart slippers, and person- identifying cabinet doors.

並列關鍵字

BLE ； Low Power ； WSN ； node ； Bluetooth

參考文獻

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