Project is remote sensor where unattended battery life is paramount. Libraries I've researched have fixed low-power periods for projects WITHOUT an external interrupt to wake. Longest low-power period is eight (8) seconds. Could you explain: Is this eight seconds a limit of the processor, or a software limit with the libraries? I'd like to be in low-power mode overnight without needing the low-power function in a loop every eight seconds for eight hours. Using a mA meter I see current draw as low as 5 mA for eight seconds but then a jump for one second each iteration of the loop. Thank you.
It's approximate, and is a feature of the watch-dog.
Thank you. I'll need to look that up and learn.
Meantime, simple question: Is there a method to go into low power for eight hours without a loop? Just go to low power, stay there eight hours and wake up?
Thank you again.
@ptmii, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project 
See About the Installation & Troubleshooting category.
Yes with an external interrupt. Could be from an external real time clock. What you're describing though is the way it's typically done.
Wake up -> Determine if stuff needs to be done -> Do that stuff -> Sleep -> Wakeup ... etc.
Thank you
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