I need to put arduino in sleep mode. I did not find the library avr/sleep.h . From where to download it.

  • 1
    Just use #include <avr/sleep.h>.
    – Gerben
    Oct 27, 2015 at 16:17
  • 1
    Why didn't you find it? Please post your code that proves this point.
    – Nick Gammon
    Oct 29, 2015 at 6:45

1 Answer 1


avr/sleep.h is part of the compiler. You don't need to download it.

There are other libraries that act as a wrapper to it to make life easier:

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