ZigBee radio chips could allow remote use of home electronics

The wireless networking technology, which uses far less power than Bluetooth and Wi- Fi, is likely to show up first in smart meters and the remote controls of high-end TVs. 

You probably have a mobile phone with a Bluetooth radio in it, and you may have a Wi-Fi network as well. Soon, you could be using a third wireless networking technology in your house.

It's called ZigBee, and it eventually might find its way into more devices than Wi-Fi and Bluetooth combined.

In the near term, you're likely to see it show up in the smart meters that utilities have begun to use and in the remote controls of high-end televisions. In the not-too-distant future, you could be using ZigBee networking to control the lights in your home, monitor your elderly parent's health or turn off your air conditioner during periods of peak energy use when no one's home.

"ZigBee is regarded as a fairly robust, good technology for many applications," said Sam Lucero, an industry analyst at ABI Research, a technology research firm.

ZigBee operates over the same 2.4-GHz frequency range as Wi-Fi and Bluetooth. Unlike those technologies, though, ZigBee transmits at much lower data rates. It's made for sending simple commands, such as turning on a TV, or small bits of data, such as whether a door is locked.

Thanks to the low data rate, ZigBee tends to use far less power than other networking technologies. The battery life of a ZigBee device can often be measured in years, rather than hours in the case of Wi-Fi or days with Bluetooth.

Also, ZigBee's standard utilizes mesh networking, which allows ZigBee devices to automatically connect with and transmit data through one another without having to go through a central gateway like a router.

ZigBee has been around for about seven years. It's primarily been used in commercial and industrial settings in alarm and monitoring systems and in expensive houses for custom-installed home-automation systems. But the technology's backers -- and analysts who follow the industry -- think it's about to hit the mainstream.

The number of ZigBee radio chips shipped has been doubling every year in recent years, hitting 20 million last year, said Bob Heile, chairman of the ZigBee Alliance, a nonprofit standards body that helps oversee and promote the technology. The group, whose members include Intel Corp., Marvell Technology Group and Cypress Semiconductor Corp., expects 100 million ZigBee chips to be shipped this year.

Part of that expected growth is driven by power companies. To better track and potentially regulate in-home energy use, PG&E Corp. and other utilities are installing millions of smart meters in California and around the country.

The National Institute of Standards and Technology has recommended that the technology be included in such meters nationwide.

That agency and other ZigBee backers envision it being used to create home-area networks. Such a network might link a thermostat, major appliances and outlets to the smart meter, allowing consumers to monitor and control the energy use of particular devices. It could also allow a power company to turn down the air conditioning in many of its customers' homes to help prevent a power outage.

ZigBee "has a good chance to be one of the primary technologies in the home for smart-energy management," said Lisa Arrowsmith, a market analyst with IMS Research, which focuses on the electronics industry. "There's a lot of enthusiasm among utilities in the U.S. to proceed down the ZigBee route."

But ZigBee is also likely to start making its way into consumers' homes via their televisions. TV and other consumer electronics manufacturers are developing remote controls that use ZigBee and other radio-frequency, or RF, technologies in place of infrared emitters and sensors.

Infrared is a line-of-sight technology that doesn't work if someone or something is in the way, or if you have your remote pointed in the wrong direction. In contrast, an RF remote will work in any direction and even from another room. 

The advantage of using ZigBee over other RF technologies is that it uses so little power that you may need to replace your television before you would have to swap out the batteries in your remote, said Cees Links, who helped develop the Wi-Fi standard and is now chief executive of Green Peak, which designs ZigBee chips.

What's more, ZigBee technology could eventually lead to a universal device to control not only your TV but also such things as your automatic window blinds and your thermostat -- and monitor how much energy you're using.

Links and other industry figures expect the first ZigBee remotes to hit the market later this year, probably as a premium feature of higher-end televisions.

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