無線協(xié)議控制，提高工業(yè)照明的能源效率

　　本文著眼于可用于控制在工業(yè)環(huán)境中的智能照明系統(tǒng)的協(xié)議，從ISM頻段的設(shè)備同時，ZigBee和WiFi。

　　工業(yè)環(huán)境中的照明系統(tǒng)越來越多地利用無線技術(shù)來提高效率和降低成本。將智能化、網(wǎng)絡(luò)化的控制器添加到照明設(shè)備中，可以在不需要的地方或不需要的地方關(guān)掉電燈，有時也可以與中央控制系統(tǒng)協(xié)調(diào)使用，降低功耗，減少電費，從而使資源得到最佳利用。

　　這些無線節(jié)點需要在材料清單、功耗和正在進行的維護方面具有成本效益。降低節(jié)點的功耗不僅可以節(jié)省電費，這在幾百甚至幾千個燈的工業(yè)環(huán)境中都是很重要的，而且還可以讓電池供電更長。這降低了維護的成本和復(fù)雜性，使節(jié)點可以輕松地改造為照明系統(tǒng)，而不必直接插入主電源。進一步降低功率可以使能量收集技術(shù)從環(huán)境中獲取能量并延長節(jié)點的壽命到多年，這是長壽命工業(yè)系統(tǒng)的一個關(guān)鍵要求。

　　There is a range of protocols suitable for connecting lighting in industrial environments that fit with the existing industrial control protocols. Zigbee， in the global unlicensed 2.4 GHz band， provides an ecosystem of single chip transceivers that integrate a controller that can also be used for local control such as temperature sensing. These are used in a mesh network so that each node can be used as a connection to the nearest neighbor rather than having to reach across an entire facility. This means the transmit power can be lower to reduce power consumption and this approach is suited to industrial lighting where small amounts of data are sent through the whole network.

　　For lower cost localized implementations， there are a number of different frequency bands in the lower ISM range below 1 GHz that can provide longer reach with the lower data rates. The Atmel AT86RF231 diversity board demonstrates the capabilities of the Zigbee 802.15.4 compliant 2.4 GHz radio transceiver coupled with a high performance AVR microcontroller to serve as a full function network node that can be driven by two AAA batteries for more than a year. Two ceramic chip antennas increase the link budget in a typical indoor scenario with multipath fading effects.