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Comment: Re:How are these pebbles powered? (Score 4, Informative) 77

by alriddoch (#9298413) Attached to: Wireless Sensors Monitor Glacier Behavior

The glacsweb probes contain about 4 small batteries. They contain a realtime clock, and are in a minimal power sleep mode for most of the time. They wake up once a day to talk to the base station on the surface. The probes are designed to last for a year, and the first batch were deployed in August 2003.

This process can check if this value is zero, and if it is, it does something child-like. -- Forbes Burkowski, CS 454, University of Washington