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If the goal is to share this with the typical population of
enthusiasts out there the 32u4 seems like the better choice, and
it's too simple to be hard to wake up. :-) I've been working on a
very tiny clock/calendar that you could slap alongside the MCU (the
clock package has a crystal inside and it and a schottky diode for
battery or capacitor backup together are smaller than the 32u4
chip).<br>
<br>
-Pete<br>
<br>
<div class="moz-cite-prefix">On 10/11/2017 11:18 AM, Josh Wyatt via
TriEmbed wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAAycYbwO9bf1yDZgSRdtW3_f==MAcrvNX=p151PSzSoaWTJtcQ@mail.gmail.com">
<div dir="ltr">Hi Alex,
<div>I don't have any guidance on the low-power aspects of the
ATSAMD21G18, but depending on your gyro chipset, the
wake-up/interrupt stuff can be tricky. I did some with with
MPU-6050 based projects, and could never get the
interrupt-wakeup situation to behave as expected. YMMV!</div>
<div><br>
</div>
<div>Thanks,<br>
Josh</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Oct 11, 2017 at 8:56 AM, Alex
Davis via TriEmbed <span dir="ltr"><<a
href="mailto:triembed@triembed.org" target="_blank"
moz-do-not-send="true">triembed@triembed.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">I'm going
to make my movement logger tether-less and am trying to
decide<br>
on an MCU. I'm familiar with 32u4 in terms of low-power
usage, but would<br>
like to consider ATSAMD21G18 for conveniences like the
built-in RTC.<br>
<br>
Any power-related reason not to choose ATSAMD21G18? I'll be
using<br>
whatever it is in the Adafruit Feather format, since it's
small and has<br>
built-in LiPo charging. I'll be using a small 100 mAH LiPo,
as I have<br>
found that size fits well between a Feather and a stacked
proto board.<br>
This size battery *should* be enough to run all night if I
come up with<br>
something clever involving thresholds on the accelerometer
and an<br>
interrupt wake pin.<br>
<span class="HOEnZb"><font color="#888888"><br>
Alex<br>
<br>
--<br>
"The theater of noise is proof of our potential."<br>
|\ | (¯ \/ |¯\ |V| |\ ¯|¯ |¯) | \/ | | | |¯\ (¯ /¯
/\ |V|<br>
|-||_ (_ /\ |_/ @| | |-| | | \ | /\ |^| | |_/ (_ . \_
\/ | |<br>
<br>
You won't find me on Facebook.<br>
<br>
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