The need for energy efficiency may not spring to mind when creating general Arduino-based projects as a fair amount of them may not leave the comfort of USB power. However if you\’re designing remote data-logging devices running from solar-charged batteries, or placing the device in a somewhat inaccessible location – the longer it can run from a set power source the better.For some interesting experiments in running an Arduino-compatible circuit for longer, the people behind the \’heliosoph\’ site have demonstrated various methods of using sleep mode, experimenting with the AVR …
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