[arm-allstar] Locked out again from SSH -

[David McGough]

Hi Mark,

>From my testing, the problem isn't the RPi power circuit. Rather, it's the 
tiny USB power connector that's the problem causing voltage drop.

See this analysis from a couple years ago:

http://lists.hamvoip.org/pipermail/arm-allstar/2017-December/006939.html


73, David KB4FXC


On Mon, 27 Jan 2020, "Mark G Thomas via ARM-allstar" wrote:

> Hi,

One problem is the Pi power circuit on the board  introduces too much 
voltage drop. In order to reliably get close enough to 5.0V where it 
counts within the Pi, it is best to use a 5.2V (or so) supply, of 
sufficient current capacity of course. If you search, you will find these 
model supplies readily available, and they work best. They are generally 
promoted specifically for the Pi.

Mark

Mark G. Thomas (Mark at Misty.com), KC3DRE

> On Jan 27, 2020, at 19:38, Bryan St Clair via ARM-allstar <arm-allstar at hamvoip.org> wrote:
> 
> Yeah, 10w is not enough power.  It should have seen low voltage messages.
> 
> 5v 2.5a is the listed requirements I still see today for a pi3 and 3+.
> 
> 3amps for the Pi4.
> 
>> On Mon, Jan 27, 2020, 15:37 "James Hause via ARM-allstar" <
>> arm-allstar at hamvoip.org> wrote:
>> 
>> Well looking at the lt states 10 watts, no idea on what the current output
>> rating is, but if 5 volts out, than possibly 2amps ?
>> It would be good to know what current level it is capable of.
>> 
>> On Mon, Jan 27, 2020 at 4:41 PM "Matt Rhoades via ARM-allstar" <
>> arm-allstar at hamvoip.org> wrote:
>> 
>>> I just rebuilt my node due to SSH password being denied:
>>> 
>>> 'root at 192.168.0.20's password:
>>> Permission denied, please try again.'
>>> 
>>> I KNOW MY SSH PASSWORD, I know that I am typing it correctly.
>>> 
>>> Last time this happened I suspected corruption and found some evidence of
>>> this in the chrontab -e.  Where there was a bunch of jumbled characters.
>>> 
>>> This is a bit frustrating as I upgraded to a class 10 micro SD card in
>>> hopes that I would eliminate this issue, sadly less that 2 weeks from a
>>> fresh ISO I'm getting the same exact error.
>>> 
>>> 
>>> 1.) What steps would the hive mind suggest to evaluate what the issue is?
>>> 
>>> I have heard of power supply issues, I'm using an apple 10W 'wall wart'
>>> like this one:
>>> https://www.walmart.com/ip/Apple-iPad-10W-USB-Power-Adapter/15148943
>>> 
>>> 2.) Is there a single most preferred power supply that I should use in
>>> favor of my current solution?
>>> _______________________________________________
>>> 
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>>> 
>>> Visit the BBB and RPi2/3/4 web page - http://hamvoip.org
>>> 
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>> 
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