Err, it might have been mA. Don't quote me on uA. I forget now.<br><br><div class="gmail_quote">On Mon, Jan 30, 2012 at 2:21 AM, Taylor Alexander <span dir="ltr"><<a href="mailto:tlalexander@gmail.com">tlalexander@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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).<div>
<br></div><div>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.</div><span class="HOEnZb"><font color="#888888">
<div><br></div><div>-Taylor</div></font></span><div class="HOEnZb"><div class="h5"><div><br><br><div class="gmail_quote">On Mon, Jan 30, 2012 at 1:41 AM, Mitch Altman <span dir="ltr"><<a href="mailto:maltman23@hotmail.com" target="_blank">maltman23@hotmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
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.<br>
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Mitch.<br>
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> Date: Mon, 30 Jan 2012 00:47:40 -0800<br>
> From: <a href="mailto:jof@thejof.com" target="_blank">jof@thejof.com</a><br>
> To: <a href="mailto:noisebridge-discuss@lists.noisebridge.net" target="_blank">noisebridge-discuss@lists.noisebridge.net</a><br>
> Subject: [Noisebridge-discuss] Long-lived, battery-powered AVRs<br>
<div><div>><br>
> I'm interested in helping someone I know with a project to build a<br>
> remote AVR-based sensor (arduino parts) that will use an Xbee to<br>
> detect a gate latch opening and closing. Since it's in a bit of a<br>
> remote spot, it has to be battery powered.<br>
><br>
> As we're brainstorming ways of saving power, we thought of a couple of<br>
> ways of not keeping things powered all the time:<br>
><br>
> - Use CPU sleep on the AVR so as to only periodically wake up and<br>
> poll the state of the gate sensor. I think the Xbee would still draw a<br>
> bit of power still.<br>
> - Use a transistor that can trigger a flip flop with a transient<br>
> amount of power from a coil in the sensor, and use that state to<br>
> switch the AVR on, and have it turn itself back off, once done<br>
> signaling.<br>
><br>
> I'm sure there's been some past work on remote AVR sensors before, but<br>
> I can't find anything that seems quite like what we're trying to do.<br>
><br>
> Any advice on something like this?<br>
><br>
> Cheers,<br>
> jof<br>
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