How do you program a sleep mode for your Arduino?
Especially for battery powered designs, what are good techniques for sleeping the CPU but waking up only when needed?
Electronic – arduino – How to Sleep Arduino
arduinoprogrammingsleep
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Best Answer
avr/sleep.h might have what you need - documentation is at http://www.nongnu.org/avr-libc/user-manual/group__avr__sleep.html
There are some warnings about putting the CPU to sleep though :)
Hope this helps.