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According to Moore's Law, microchips double in power every 18 to 24 months.
 

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1 ibuttonlgThis article will give basic overview of iButton functionality and usage. Example of iButton usage with complete source code can be read in article iButton AVR readout example project used with DS1990R-F5The iButton is a computer chip enclosed in a 16mm thick stainless steel can. Because of this unique and durable container, up-to-date information can travel with a person or object anywhere they go. The steel iButton can be mounted virtually anywhere because it is rugged enough to withstand harsh environments, indoors or outdoors. It is small and portable enough to attach to a key fob, ring, watch, or other personal items, and be used daily for applications such as access control to buildings and computers, asset management, and various data logging tasks.

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