As part of the Energy Brain I want the ATtiny uC to monitor the Li-Ion cell and the super-capacitor voltage. When either drops below a certain level, the ATtiny communicates on an interrupt line with the uC in the Memory & Learning Brain and lets it know what's up. The Memory & Learning Brain can then decide what to do with that information; to initiate a recharge of the super-capacitor, to communicate a request for solar charge to the outside world, to alter sensing and communication behavior in ways that conserve energy, or to send other Brains into sleep mode.
What I'm trying to mimic here is the connection between the biological gut and brain; the involuntary sensation of hunger or exhaustion, and the intentional decision to eat, sleep, or forage for food.
