[Noisebridge-discuss] Long-lived, battery-powered AVRs

[Taylor Alexander]

Xbees have a sleep mode that can be activated via the sleep pin (very low
power - uA) or serial (not as low power but it shuts off the radio).

I'm too busy to help otherwise but thought I would share that knowledge.
The sleep functions are detailed in the Xbee datasheet, but I just wanted
you to know its pretty simple.

-Taylor


On Mon, Jan 30, 2012 at 1:41 AM, Mitch Altman <maltman23 at hotmail.com> wrote:

>
> I'm not familiar with Xbee, so I don't know if it has a low-power mode.
> But AVR chips are pretty low power when in sleep-mode. But Arduino isn't so
> low-power, so if you can use the AVR micro without Arduino, that'll save
> you power.
>
>
>
> Mitch.
>
>
>
>
>
> -------------------
>
>
>
> > Date: Mon, 30 Jan 2012 00:47:40 -0800
> > From: jof at thejof.com
> > To: noisebridge-discuss at lists.noisebridge.net
> > Subject: [Noisebridge-discuss] Long-lived, battery-powered AVRs
> >
> > I'm interested in helping someone I know with a project to build a
> > remote AVR-based sensor (arduino parts) that will use an Xbee to
> > detect a gate latch opening and closing. Since it's in a bit of a
> > remote spot, it has to be battery powered.
> >
> > As we're brainstorming ways of saving power, we thought of a couple of
> > ways of not keeping things powered all the time:
> >
> > - Use CPU sleep on the AVR so as to only periodically wake up and
> > poll the state of the gate sensor. I think the Xbee would still draw a
> > bit of power still.
> > - Use a transistor that can trigger a flip flop with a transient
> > amount of power from a coil in the sensor, and use that state to
> > switch the AVR on, and have it turn itself back off, once done
> > signaling.
> >
> > I'm sure there's been some past work on remote AVR sensors before, but
> > I can't find anything that seems quite like what we're trying to do.
> >
> > Any advice on something like this?
> >
> > Cheers,
> > jof
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