[arm-allstar] One of two USB URIs dropping off

Sat Jan 12 17:37:40 EST 2019

Correction.
Power dropped from 195mA to 142mA, saving 53 mA.

On Sat, Jan 12, 2019 at 2:36 PM Randy Neals <randy at neals.ca> wrote:

>
> Still having one of the URIs stop, but using the "dmesg" command, we are
> seeing low voltage alerts.
> ie: [   13.607990]
>
> *Under-voltage detected! (0x00050005)*I'm not able to make a trip to the
> repeater site to replace the power supply for a few days.
> So I'll try something else...
>
> I'm not using WiFi on the Pi.
> According to this thread, turning off WLAN0 results in 142mA lower current.
> If my power supply is weak, perhaps saving 142mA will provide better
> voltage control.
>
> https://www.raspberrypi.org/forums/viewtopic.php?t=208110.
>
> ifconfig wlan0 down
>
>
> -Randy
>
>
>
> On Fri, Jan 11, 2019 at 9:56 PM "Doug Crompton via ARM-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
>> Randy,
>>
>> Being able to power cycle a remote Pi is very important. There are many
>> ways to do that as you know so you have to pick the best one for you.
>>
>> I think the one radio node per Pi especially if both nodes are running
>> repeaters is a good idea. Management is a lot easier if you use supermon
>> and configure all nodes on one screen. You can instantly see the status of
>> everything and have control of all the connections. I have 13 nodes and
>> servers both local and remote displayed on one supermon screen. Even if
>> you
>> had multiple supermon screens they could be in adjacent tabs on a browser.
>>
>>
>> *73 Doug*
>>
>> *WA3DSP*
>>
>> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
>>
>> On Sat, Jan 12, 2019 at 12:45 AM "Randy Neals via ARM-allstar" <
>> arm-allstar at hamvoip.org> wrote:
>>
>> > I agree. The suppliers on Amazon for those potted dc dc converters
>> change
>> > like the weather.
>> >
>> > The 3B+ uses an entirely new DC regulator module.
>> > A custom design for the Raspberry Pi.
>> >
>> >
>> > I’m thinking of using POE Hats and powering my Pi’s from an Ethernet
>> > switch. If the switch is “Managed”, it also provides a way of turning
>> off
>> > the port and rebooting the Pi.
>> >
>> > The second gen Pi POE Hat would seem like an elegant solution.
>> >
>> > I may also revert to a Pi per repeater.
>> > I dislike having multiple Pi’s to admin and multiple firewall port
>> > mappings, but I like reliable nodes better :)
>> >
>> > https://www.raspberrypi.org/blog/poe-hat-revision/
>> >
>> >
>> >
>> > On Fri, Jan 11, 2019 at 10:11 PM David McGough <kb4fxc at inttek.net>
>> wrote:
>> >
>> > >
>> > >
>> > > Hi Randy,
>> > >
>> > > Okay, yes, looking at the dmesg output, this issue looks power
>> related,
>> > > one way or another. Note below that just after the "under voltage"
>> > > warning, and before the "voltage normalized," the URI(s) aren't happy.
>> > >
>> > > The micro-USB power connection on the RPi3b+ may be the problem.
>> Another
>> > > factor that we've noticed recently is that some brands of the epoxy
>> > potted
>> > > 5V3A DC-DC converters don't perform as well as others. Frustrating.
>> > >
>> > > A subtle ground loop, even with the hardware in same chassis, might be
>> > the
>> > > culprit, too.
>> > >
>> > > 73, David KB4FXC
>> > >
>> > >
>> > >
>> > > On Fri, 11 Jan 2019, Randy Neals wrote:
>> > >
>> > > > Hi David,
>> > > > Thanks for the email...
>> > > >
>> > > > Usually just one URI stops. It seems to be the first port, my VHF
>> > > repeater.
>> > > > Earlier it seemed like it was alternating with no pattern between
>> > > repeaters.
>> > > > (Thus I wasn't suspecting a bad URI)
>> > > >
>> > > > No reboot of the system, no hang. Other repeater usually continues
>> to
>> > > > operate.
>> > > >
>> > > > The repeaters are ICOM FR-5000/FR-6000
>> > > > Both repeater RF modules are in the same metal Icom rack chassis,
>> ie:
>> > > same
>> > > > ground for both repeaters.
>> > > > The Audio and COR/PTT come out on DB25 connector on back of
>> repeater.
>> > > > 1' cable with signal/audio to URI
>> > > >
>> > > > The repeaters are powered from 12VDC power distribution.
>> > > > 12V power is from a large communications power supply (Switch mode
>> N+1
>> > > > redundant) with battery backup.
>> > > >
>> > > > The 5V Pi power is a DC to DC converter rated at 3 Amps. 12V from
>> the
>> > > same
>> > > > distribution as repeater. 5V on micro USB to Pi.
>> > > > At first I had a different PS, and swapped early thinking that was
>> the
>> > > > problem.
>> > > >
>> > > > The Pi is in an aluminum chassis with a tiny fan.
>> > > > It is on a rack shelf above the repeater. The Pi chassis is not
>> > grounded,
>> > > > but it has 2 USB cable, and the power supply cable to the DC DC
>> > converter
>> > > > which may have ground.
>> > > >
>> > > > Here's dmesg
>> > > > I see several "under voltage" messages. That doesn't seem good.
>> > > >
>> > > > I rebooted just a few minutes ago. When the URI stops again, I'll
>> run
>> > > dmesg
>> > > > again.
>> > > >
>> > > >
>> > > > [    7.215868] sd 0:0:0:0: [sda] Assuming drive cache: write through
>> > > >
>> > > > [    7.222428]  sda: sda1
>> > > >
>> > > > [    7.227933] sd 0:0:0:0: [sda] Attached SCSI removable disk
>> > > >
>> > > > [    8.300598] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps,
>> full-duplex,
>> > > lpa
>> > > > 0xD1E1
>> > > >
>> > > > [   13.608033] *Under-voltage detected! (0x00050005)*
>> > > >
>> > > > [   17.229524] retire_capture_urb*: 119 callbacks suppressed*
>> > > >
>> > > > [   21.938034] Voltage normalised (0x00000000)
>> > > >
>> > > > [   26.348512] retire_capture_urb*: 18 callbacks suppressed*
>> > > >
>> > > <snip>
>> > >
>> > > --
>> > Sent from mobile.
>> > _______________________________________________
>> >
>> > ARM-allstar mailing list
>> > ARM-allstar at hamvoip.org
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>> >
>> > Visit the BBB and RPi2/3 web page - http://hamvoip.org
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>
>