智能建筑的物聯(lián)網(wǎng)傳感器的橋梁設(shè)計

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　　傳感器是物聯(lián)網(wǎng)的眼睛和耳朵（物聯(lián)網(wǎng)）。他們提供所需的數(shù)據(jù)來了解環(huán)境，因此可以作出明智的決定，需要采取什么樣的活動。智能建筑，特別是，可以受益于廣泛部署的傳感器，使能源的使用可以控制的最佳照明，供暖和空調(diào)。建筑安全可以通過傳感器來檢測員工的安全水平和控制建筑物或房間的訪問。在緊急情況下，可以提高安全性，提供安全出口的通知，并在停電時提供應(yīng)急照明。

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　　傳感器通常工作在非常低的功率，這可以限制他們的溝通能力，在長距離和高數(shù)據(jù)速率。通常橋接設(shè)備用于收集和處理各種本地低功耗傳感器讀數(shù)，然后轉(zhuǎn)發(fā)使用遠程協(xié)議的匯總數(shù)據(jù)。采用Wi-Fi?模塊、嵌入式處理器是用戶可編程的可以很容易地創(chuàng)建中級物聯(lián)網(wǎng)橋接系統(tǒng)。本文將看看這些模塊中的一些來說明，與一個例子實現(xiàn)，如何Wi-Fi模塊/基于MCU的設(shè)計可以很容易地聚集和溝通傳感器數(shù)據(jù)在智能建筑物聯(lián)網(wǎng)應(yīng)用。

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　　Bridging for power efficiency

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　　In smart buildings sensors can generate a very wide range of data bandwidths. Environmental monitors may only transmit a small number of bytes of data a few times a second， while security cameras might have megabytes of data to transmit in the same time period. Even low bandwidth connects can generate significant data traffic when many sensors are aggregated and buffered. Often it is much more power efficient to “burst” data at a higher data rate instead of sending it one small data transmission at a time.

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　　In order to manage the wide range of data bandwidth requirements and the range of distances wireless signals can span in a smart building， bridging devices are required. In addition， bridging devices can be used to optimize the power requirements of autonomous low-power sensors， where battery lifetime， particularly in emergency situations， can be critical. Bridging devices must handle a variety of wireless protocols， from Bluetooth? low energy （Bluetooth LE） to the full range of Wi-Fi connectivity schemes. Additional requirements for a robust smart building design would include local data storage， local energy storage in case of power loss， and perhaps a simple user interface for status， diagnostics， and local control.

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