[arm-allstar] Voltage

[David McGough]

Hi Tony,

Yes, you can easily check the RPi voltage remotely, but, this isn't the 
best approach. The RPi under-voltage check already tells you that you've 
got a serious problem and SD card corruption or a system crash could 
happen at any time.  In fact, SD card corruption might have already 
occurred when you see the RPi undervoltage warnings.

For my RPi boards, I use a small LM2596 DC-DC converter boards, as have 
been mentioned several times. In my case, these converters have 
nominally about 8V to 21V input and provide a high quality 5V output over 
the whole input voltage range.  If on batteries, my input should never 
drop below about 12.5V. If/when the input does drop below 12.0V, I 
initiate a shutdown on the RPi boards.

So, what you really need is a input voltage monitoring solution, which 
will trigger and cause shutdown, long before you start getting RPi 
under-voltage alarms.


73, David KB4FXC


On Sat, 30 Jan 2021, "Tony Grigajtis via ARM-allstar" wrote:

> Does anyone know of a way to remotely (ssh) check power in volts or on a
> Raspberry Pi?
> 
> I know how to look for under-voltage but I want to monitor a remote node on
> solar power and want to be able to shut it down to avoid memory corruption.
> 
> Thanks,
> Tony, W2KJV
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