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Sensors Keep Their Cool

Terry Costlow, Contributing Editor -- Design News, October 8, 2007

Melted ice cream or spoiled meat are often the first sign grocery store refrigeration systems are malfunctioning. El Rancho Market in Solvang, CA, turned to a wireless sensor network system to monitor temperature and send alerts. Motes that house temperature sensors, radios and tiny computers are placed inside the market's refrigerators and freezers, monitoring them on a 5-min cycle. Status updates are sent wirelessly over the Internet. Text message alerts are sent to desktop or handheld computers when something's wrong. System integrator Comware International created the motes, which employ sensors and networks from Arch Rock Corp.

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