<div dir="ltr"><div><div><div><div><div><div><div>PI power. I had a lot of problems with my pi wifi.<br></div>I found the problem to be caused by a six foot long usb power cable.<br></div>Replaced it with a 3 foot one and my problems went away.<br>
<br></div>Measure the voltage on, I think it was tp1.<br></div>I was way below recommendations.<br><br></div>I'm still having erratic drops in wifi. <br></div>This morning I noticed it was down, re-plugging the wifi dongle fixed it, apparently it had rebooted.<br>
The uptime once I got around to checking was only 42 minutes.<br><br>I just finished writing a script to check network availability and if it drops, re-boot.<br><br></div>I should hook up my kilowatt to it and see what the usb wall wart is drawing.<br>
<br><div>---------<br></div><div>Vince<br><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, May 18, 2013 at 11:39 AM, <span dir="ltr"><<a href="mailto:jep200404@columbus.rr.com" target="_blank">jep200404@columbus.rr.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Sat, 18 May 2013 09:59:46 -0400, Scott Merrill <<a href="mailto:skippy@skippy.net">skippy@skippy.net</a>> wrote:<br>
<br>
> Can someone tell me - in general - which would draw more power on a<br>
> Raspberry Pi: a USB WiFi adapter or the onboard Ethernet port?<br>
<br>
</div>That depends on the USB Wifi adapter. I have an old one that I<br>
think pulls around 450 mA. That's much for any USB thing,<br>
and much more than the ethernet port uses.<br>
However, for newer Wifi adapters, althought I just don't _know_<br>
how much power they use, it's likely to be much less than my<br>
old Wifi adapter.<br>
<br>
Look at the output of lsusb to see the claimed max power for<br>
each USB thing you try. IIRC, the Pi's ethernet port is a USB<br>
device.<br>
<br>
I guess in your case the power supply comparison would be<br>
USB Wifi versus _incremental_ power used by ethernet port<br>
when something is plugged into it and schlepping bits back<br>
and forth.<br>
<div class="im"><br>
> Or is the power draw differential so inconsequential as to not be worth<br>
> worrying about?<br>
<br>
</div>That depends on what your power concerns are. If you are running<br>
on batteries, it can be a big big concern. My Pi was flaky because<br>
the wall wart I was using just was not powerful enough. After I<br>
started using a more powerful wall wart, it became reliable.<br>
In some other applications, heat can be a concern.<br>
<br>
Besides curiosity, what power concerns do you have?<br>
<br>
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</blockquote></div><br></div>