I'm going to build a small planter box for some herbs in the kitchen, with a built-in water reservoir/pump and a 1307 RTC that the chip will use to read the time and activate the pump in the morning. I'm debating whether or not to have the AT328 (will probably use an Arduino Pro Mini, with the regulator disabled if I go this route) go to sleep to conserve battery power.
If I put the chip to sleep, I'd have to wake it up using either the 1Hz output from the 1307, or using the watchdog timer every several seconds. I'm wondering if this approach will practically reduce the current consumption enough to make it worthwhile as opposed to just leaving the chip running and scanning the 1307 at all times.
Anybody have any thoughts/comments/advice on this?