Not trying to troll - just don't know. Why would anybody use an Arduino versus a five dollar Raspberry Pi Zero?
ADC, DAC, and 2.95uA timers. Can your Rasp. Pi Zero sleep at micro-amp currents, and self-wakeup 5 hours from now to perform some task, and go back to sleep? The specs here for this Arduino are downright ridiculous for low-power applications. We're talking about using 3x AA batteries for MONTHS. (3x NiMH AA will be 3.6V with 2000 mA-hrs. Using 3uA is 600,000 hours of battery, or 25,000 days of charge. You'll "only" l…
I wonder if the newer low-self-discharge batteries might get you even more lengthy usage times. Something like a gen 2 Eneloop lite can hold onto 60% of its capacity after five years[1], which is just plain insane.