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

[Taylor Alexander]

Err, it might have been mA. Don't quote me on uA. I forget now.

On Mon, Jan 30, 2012 at 2:21 AM, Taylor Alexander <tlalexander at gmail.com>wrote:

> 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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>
>
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