The following email exchange has been zipping through the electrons here at Control. The commenter and the responders all raise good points. I thought I'd open the subject up for further responses.
From the press release:
Industrial Wireless Temperature Transmitter Powered by Heat
On Tuesday, the prestigeous MIT Technology Review published a story by Duncan Graham-Rowe in which he claimed that Nokia "hopes to create a device that could harvest enough power to keep a cell phone topped up."
One of the several elephants in the wireless sensor network room is the apparent need to have thousands of batteries onsite in a fully developed network, and the need to have to go change out those batteries after some years (some say three years, some say five years, some say...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fundamental breakthrough creates battery-free wireless lighting control Four Harvesters Capture 'Unused Environmental Energy' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SALT LAKE CITY, Utah -- The lighting market can be a demanding taskmaster. p It wanted battery-free, wireless lighting control, especially for large installations where battery management could be a real headache.