无线协议控制，提高工业照明的能源效率

　　无线协议控制，提高工业照明的能源效率

　　本文着眼于可用于控制在工业环境中的智能照明系统的协议，从ISM频段的设备同时，ZigBee和WiFi。

　　工业环境中的照明系统越来越多地利用无线技术来提高效率和降低成本。将智能化、网络化的控制器添加到照明设备中，可以在不需要的地方或不需要的地方关掉电灯，有时也可以与中央控制系统协调使用，降低功耗，减少电费，从而使资源得到最佳利用。

　　这些无线节点需要在材料清单、功耗和正在进行的维护方面具有成本效益。降低节点的功耗不仅可以节省电费，这在几百甚至几千个灯的工业环境中都是很重要的，而且还可以让电池供电更长。这降低了维护的成本和复杂性，使节点可以轻松地改造为照明系统，而不必直接插入主电源。进一步降低功率可以使能量收集技术从环境中获取能量并延长节点的寿命到多年，这是长寿命工业系统的一个关键要求。

　　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.