In order for the device to wake up by itself, is it necessary to have a PIN connected or does the Arduino wake up by itself in time?
This is the definitive source for all your questions
I consider it to be required reading for anyone messing with sleep.
tl;dr: yes, microprocessors can wake themselves up.
a7
Sleep and wake-up depend on the actual board used. Keep in mind without telling us what board you use we always assume an UNO to be used.
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