On 03/11/2021 01:49 mikenjapan via groups.io <mikenjapan@...> wrote:


I bought a hotspot from Ebay (China) and it was working great. I wanted to configure it to use in my truck so I changed the wifi info to my iphone hotspot info. I could connect to the pi through my phone. It looked good and talked from the radio to hotspot but not out to the internet, so I rebooted. Dashboard Came up but said it wasn't connected to ??the interface?? (Sorry, I don't remember but basically in the area where the wifi info is on the dashboard) and not connected to wifi. I trie3d putting in the wifi info but it wouldn't take. It would not connect and then empty the name and password fields. I tried it again by saving changes and rebooting. Nothing. It won't boot up at all. I have tried different versions of Pi-star and flashed them onto an SD card and none will boot up. What am I doing wrong?

Don't do it on just one thumb drive. 

I've had them die with no warning...
the failure modes I've seen are:

1) go to totally not there with no warning.
2) "Disk is unreadable, must be formatted"
3) go to read-only with no warning... at least that one is copyable to a new drive.
4) display a message "Insert a disk into drive (letter)" where the (letter) is what the drive's letter was yesterday.

I've got a 256 gig one that is in the last state right now and haven't a clue as to how to get the data back.

Does anybody have something like the below already operational?
or even close?
We have a few repeaters at hilltop sites...  each site has internet,
and around 400 AH of 12 volt battery.   Each site as internet brought
in via an Ubiquity 5 gig microwave shot.  The Ubiquity and the router
are run off the 12 volt battery.

And occasionally a site loses AC power.

We'd like to set up a Pi (connected to the router via an ethernet
cable) to run off the battery bank and use a 5 volt wall wart to
function as the local AC power sensor.  Or maybe the wall wart
drives a relay coil and the relay contacts are used to tell the
Pi that the AC power has failed.

On a power fail we'd like the Pi to send an email message to a list
of addresses (probably 8 to 10 addresses)...   Something like
"AC power has failed at (site name) at (local time) on
(day of week) (date)"...
i.e. "AC power has failed at Mike's house at 14:30 on Sunday
October 31 2021".

Then when AC power returns it goes through it's cold boot cycle
and then sends an email (to the same list)... something like
"AC power has returned at (site name) at (local time) on
(day of week) (date)".

And every so often (settable) it sends a status message to a
separate list of email addresses... something like "(site name)
AC power monitor is on line, the last power fail was at (time)
on (day of week) (date), last power return was at (time) on
(day of week) (date)".  Initially the status email will probably
be daily at noon, but once the folks are comfortable that
the unit is reliable the status messages will probably be
backed off to weekly.

Note that when the Pi cold boots it has to note the time,
day and date from it's RTC board, then it needs to wait a
minute or so (to allow the microwave internet link to
re-establish), then pings the us.ntp.org server to verify
the link is actually up (and BTW to verify the actual time
and date).

Comments, suggestions, etc are welcome.

I don't mind buying a commercial product as
long as there isn't a  monthly charge and it's
a stand-alone device (i.e. not cloud based).

Thanks in advance

Mike WA6ILQ   (callsign //at// gmail //dot// com)

Group

Free, did it for me. Thanks loads! Case closed

A few recommendations to run from the command line:

    free
      - This will show the amount of RAM populated, used (for programs and cache)

   cat /proc/cpuinfo
      - This will list the type and number of CPU cores

   bash <(wget -q -O - "http://www.trinityos.com/HAM/CentosDigitalModes/RPi/usr/local/bin/review-rpi-cpu.sh")
      - This will download a script I put together to show lots of additional details specific to the Raspberry Pi


For different Rpi pictures, showing the differences, use a Internet search of "pictures of all raspberry pi models" will bring up many examples

--David
KI6ZHD

On 10/29/2021 11:20 AM, vince kd7tww wrote:

Hello Group

I have a new to me Pi board. How do I check the specs of a RPi Board on the command line. I.E. Cpu, mem?

On top of the RPi board it just notes it's a Raspberry Pi 4B but does not say the amount of memory? Also, is there a pictorial (picture of different RPi's) displaying the different versions (Component layouts)?  TIA

-- 
73, de Vince KD7TWW
In what year did the FCC mandate the 1500 Watt PEP limit for amateur radio station
power output? - Motorola Corp was formally named
"Galvin Manufacturing Corporation" (1928–1947)