Click on the link below to check out the collection of the Design Articles, Case Studies, Product How-To articles, Teardowns, etc... related to energy scavenging that have been published on Smart Energy Designline.
Click here: http://www.eetimes.com/design/smart-energy-design/4372778/Energy-harvesting---Design-archive
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Looks interesting. It takes time for the market to develop. Energy harvesting surely is an interesting area, both for the transducers and power management. To-date, maybe the cost is of the harvester is also a big concern