On Tue, Nov 22, 2011 at 5:14 PM, Bret Foreman <[email protected]> wrote: > No, I don't have to take sensor data except right before I launch the > daily reading. But even when the CPU is just ticking over doing > nothing it still has to keep a bunch of volatile state in registers > and RAM and such. All that stuff might add up to over 1 mA. Really > deep sleep modes usually store everything volatile into flash and then > current drops to under 10 uA - just enough to run a little wake-up > counter. But I don't think Android can do anything like that, even if > the underlying hardware (like the ATMega) supports it.
I was under the impression that the CPU was stopped in Android's sleep mode, but I certainly could be mistaken. The closer you get to hardware, the worse my comprehension. > Solar is not an option but outboard batteries might work. Charging > through the USB port is not very efficient, though, so I'd lose a lot > of the benefit of a big external battery. You could always go with a diesel generator... :-) If you want, give me an idea of what sort of device you'd want to be running, and I can try to find something roughly equivalent here in my Secret Mountain Lair. I'll charge it up, put it on airplane mode, and let it sit for a couple of weeks, and we'll see what the battery level dropped to, with the stock battery. You could run that test too, of course, if you have a spare device lying around. While it wouldn't include the drain from your app, it'd at least give you an idea as to whether or not there's a prayer of it working for four months. -- Mark Murphy (a Commons Guy) http://commonsware.com | http://github.com/commonsguy http://commonsware.com/blog | http://twitter.com/commonsguy _The Busy Coder's Guide to *Advanced* Android Development_ Version 2.1 Available! -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
