Date   

Re: Case Arrived! Screw size?

Jack Spitznagel
 

Ed, All,

Mine were in the box with the case. Small plastic bag that also had the stand-offs and silicone stick-on feet. I just ordered one of the new design for the later generation DRAWS board.

One issue: my Rpi was reporting via the DRAWS manager that CPU temp reach 140+ F.... not wonderful... SO: I need to know if anyone has a model number for a quality fan that will fit the case. There is a dizzying array of fans out there, I figure out the size, but reasonable quiet and low current consumption would be better.

I have a couple of CPU fans that are too large for the hole spacing... I'm not hacking a new case to make it work.

Jack Spitznagel – KD4IZ
Science River LLC
Biomedical Consulting Services

-----Original Message-----
From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Ed Bloom, KD9FRQ via groups.io
Sent: Saturday, February 6, 2021 14:03
To: udrc@nw-digital-radio.groups.io
Subject: [draws and udrc] Case Arrived! Screw size?

My two case arrived today! Fantastic.

I seem to have missed the link the screw sizes need to secure the

top to the base.


Ed, KD9FRQ


Case Arrived! Screw size?

Ed Bloom, KD9FRQ
 

My two case arrived today!  Fantastic.

I seem to have missed the link the screw sizes need to secure the

top to the base.


Ed, KD9FRQ


DRAWS Aluminum Case Arrived Today!

Dave Slotter, W3DJS
 

It looks sharp and fits great! Worth the wait!

--
- Dave
  W3DJS


Re: HOW TO gracefully shutdown an RPi with DRAWS

Basil Gunn
 

Some links for the previous post:

nixtracker source with picture of radio/rpi setup before final install.
https://github.com/n7nix/nixtracker

nixtracker install script with graceful shutdown example in updown_log.sh
https://github.com/nwdigitalradio/n7nix/tree/master/tracker

nixtracker thread on groups.io
https://nw-digital-radio.groups.io/g/udrc/topic/70085931#4384


Basil Gunn <basil@pacabunga.com> writes:

From: Alex Archer - KC0REL

Does the hat allow the pi to be gracefully shutdown when attached to a
mobile setup directly wired to the battery when it detects a voltage
drop from alternator voltage to battery voltage only?
Yes the DRAWS hat has everything required to do a graceful RPi shutdown.

It has an A/D converter that measures the 12V source voltage.
Periodically reading that voltage with cron you can detect when your
vehicle is turned off going from alternator to battery. There is an
example on how to do that in this script n7nix/tracker/updown_log.sh.

You read the output of 12V with the sensors command and
peel off the number you are interested in.

From a console run the "sensors" command to see the output you are
dealing with. From the updown_log.sh script the following line extracts
the 12V value.

voltage=$(sensors | grep -i "+12V:" | cut -d':' -f2 | sed -e 's/^[ \t]*//' | cut -d' ' -f1)

To do a compare in bash I want the voltage as an integer so I get rid of
the plus sign & decimal point

volt_int=$(echo "${voltage//[^0-9]/}")

I use the volt_int value to detect when I need to gracefully shut down the RPi

if (( volt_int < 1300 )) ; then
sudo /sbin/shutdown -h now
fi

Instead of an APO3 I use a Powerwerx ITS-12. For the APRS app I use a
fork of Dan Smith's dantracker which runs in a browser. In my vehicle
I run a hostap on the RPi and connect over WiFi so that I can use my
phone or tablet as a display.

There is a nixtracker thread here:
https://nw-digital-radio.groups.io/g/udrc/topic/70085931#4456

I've been using this setup for over a year in my truck.

/Basil n7nix

From: "Alex Archer" <alex@aactrain.com>
Subject: DRAWS hat question
Date: February 4, 2021 at 3:24:59 PM PST

Does the hat allow the pi to be gracefully shutdown when attached to a
mobile setup directly wired to the battery when it detects a voltage
drop from alternator voltage to battery voltage only?

My mobile setup currently has everything running through an
APRSworld.com APO3 that automatically cuts power to everything
downstream of it 10 minutes after seeing the drop from alternator to
battery voltage. I'd like to have the ability to gracefully shut down
the pi, after say 9 minutes (thus before power is cut off by the APO
device), and the additional capabilities your hat provides interests
me, especially the ability to control 2 radios.

-- Alex Archer -
KC0REL alex@aactrain.com


HOW TO gracefully shutdown an RPi with DRAWS

Basil Gunn
 

From: Alex Archer - KC0REL

Does the hat allow the pi to be gracefully shutdown when attached to a
mobile setup directly wired to the battery when it detects a voltage
drop from alternator voltage to battery voltage only?
Yes the DRAWS hat has everything required to do a graceful RPi shutdown.

It has an A/D converter that measures the 12V source voltage.
Periodically reading that voltage with cron you can detect when your
vehicle is turned off going from alternator to battery. There is an
example on how to do that in this script n7nix/tracker/updown_log.sh.

You read the output of 12V with the sensors command and
peel off the number you are interested in.

From a console run the "sensors" command to see the output you are
dealing with. From the updown_log.sh script the following line extracts
the 12V value.

voltage=$(sensors | grep -i "+12V:" | cut -d':' -f2 | sed -e 's/^[ \t]*//' | cut -d' ' -f1)

To do a compare in bash I want the voltage as an integer so I get rid of
the plus sign & decimal point

volt_int=$(echo "${voltage//[^0-9]/}")

I use the volt_int value to detect when I need to gracefully shut down the RPi

if (( volt_int < 1300 )) ; then
sudo /sbin/shutdown -h now
fi

Instead of an APO3 I use a Powerwerx ITS-12. For the APRS app I use a
fork of Dan Smith's dantracker which runs in a browser. In my vehicle
I run a hostap on the RPi and connect over WiFi so that I can use my
phone or tablet as a display.

There is a nixtracker thread here:
https://nw-digital-radio.groups.io/g/udrc/topic/70085931#4456

I've been using this setup for over a year in my truck.

/Basil n7nix

From: "Alex Archer" <alex@aactrain.com>
Subject: DRAWS hat question
Date: February 4, 2021 at 3:24:59 PM PST

Does the hat allow the pi to be gracefully shutdown when attached to a
mobile setup directly wired to the battery when it detects a voltage
drop from alternator voltage to battery voltage only?

My mobile setup currently has everything running through an
APRSworld.com APO3 that automatically cuts power to everything
downstream of it 10 minutes after seeing the drop from alternator to
battery voltage. I'd like to have the ability to gracefully shut down
the pi, after say 9 minutes (thus before power is cut off by the APO
device), and the additional capabilities your hat provides interests
me, especially the ability to control 2 radios.

-- Alex Archer -
KC0REL alex@aactrain.com


Mounting fan on DRAWST Case

Daniel VE3NI
 

Hi All,

Received my Early Adopter's case and it looks great.

I love the fact that the case had been redesigned so that the 12V power mod
was no longer needed. It is simply a drop-in replacement . . . no changes
required.

I purchased the "suggested/recommended" fan and prepped it with longer
leads to go around to the end Accessory Connector (HDR-4X2M).

Was NOT surprised when the bolts supplied with the fan were too large to
attach to the case because life is never that simple, hi hi.

Hoping that someone else has already figured out the appropriate size of the
bolts to attach the fan and are willing to share. Or possibly NWDR can
provide the information from the CAD drawings for the case.

Using a rPi 3B+ and it runs about 59C with no fan but drops to around 45C
when I put my OLD fan from the old case simply sitting on top. The rPi/DRAWS
is located in a semi-enclosed space so the extra cooling is appreciated.

Love my DRAWS card.

Cheers es 73,
Daniel VE3NI


Re: DRAWS™ Cases are Shipping to Customers!

 

Early Adopter Case Backorders are complete, although we have a few customers that ordered a production DRAWS board and a EA case that we need to figure out before we fill new EA Orders.

Kit orders are next and yes it has been shipping hell!
Bryan K7UDR


Re: DRAWS™ Cases are Shipping to Customers!

John NU8M
 

My case arrived today...excited to put it together! Thanks and 73 John NU8M


Re: DRAWS™ Cases are Shipping to Customers!

okiejim
 

I got my email with tracking yesterday with tracking number and it is tracking. My order was from may 2019 just FYI. My guess is they have alot to ship out and not much space to get them to the P.O. I can verify they are shipping but I don't think they made the end of month part as yesterday was the 1st of Feb.
73


On Tue, Feb 2, 2021 at 11:39 AM LA9KOA - Karl <oyoygard@...> wrote:
This is fantastic news!
Did you manage to ship all cases by the end of jan? I can't see I've received any tracking yet.
I should have orders for two early adopter and one production case.
[Order #6348] (April 17, 2019)
[Order #8043] (December 8, 2020)

73, LA9KOA, Karl

On Sun, Jan 31, 2021 at 8:27 PM kc7pmu <kc7pmu@...> wrote:
Received early adopter case Saturday, Jan 30. 
Case looks good. Haven't tried it on my unit as I have it in the C4Labs acrylic case presently.
--

Paul
kc7pmu


Re: DRAWS™ Cases are Shipping to Customers!

LA9KOA - Karl
 

This is fantastic news!
Did you manage to ship all cases by the end of jan? I can't see I've received any tracking yet.
I should have orders for two early adopter and one production case.
[Order #6348] (April 17, 2019)
[Order #8043] (December 8, 2020)

73, LA9KOA, Karl

On Sun, Jan 31, 2021 at 8:27 PM kc7pmu <kc7pmu@...> wrote:
Received early adopter case Saturday, Jan 30. 
Case looks good. Haven't tried it on my unit as I have it in the C4Labs acrylic case presently.
--

Paul
kc7pmu


DRAWS kit for sale

Matthew Allred <kilo1mda@...>
 

Kit for sale comes with the following:
DRAWS HAT
GPS Antenna with LNA
2 Mini DIN-6 M/M 2m Cables
Anidees Aluminum Case
5.5mm x 2.1mm Power Connector
Raspberry Pi 4B+ with Heatsinks installed
32GB Micro SD-CARD preloaded with image

$250 shipped. 

Please message me at kilo1mda@... 


Re: Buck converter vs power from Pi question... #12vsupply

Jack Spitznagel
 

“Appropriate Attachment” for “Breg the beast” would be 1/4” carriage bolts with oversize washers. My safest approach would be to fasten a piece of angled galvanized sheet metal outside a window near the op station with a plastic container placed over the puck. 🙂

Jack - KD4IZ 

On Feb 1, 2021, at 22:29, kc7pmu <kc7pmu@...> wrote:

You might try a steel pie plate or cookie sheet attached to the shelf with means and methods appropriate to the size of the sweet puddy tat. The magnet should keep the GPS puck anchored sufficiently for occasional excursion by the perp.

I find the method sufficient for my 2m mag mount antenna and the GPS puck.

Good luck.

Paul
kc7pmu


Re: Buck converter vs power from Pi question... #12vsupply

kc7pmu
 

You might try a steel pie plate or cookie sheet attached to the shelf with means and methods appropriate to the size of the sweet puddy tat. The magnet should keep the GPS puck anchored sufficiently for occasional excursion by the perp.

I find the method sufficient for my 2m mag mount antenna and the GPS puck.

Good luck.

Paul
kc7pmu


Re: Buck converter vs power from Pi question... #12vsupply

Jack Spitznagel
 

Bryan,

Sounds good…

“Death by Kitty” with a basso profundo voice (think James Earl Jones as Darth). When one has a 22lb Maine Coon Cat who is a pro at shelf surfing, one need not do stupid things like leaving fragile objects on window sills and bookshelf shelves. Shame on me.

Anyway, I need some SMC soldering practice…. 😊 Maybe I can troubleshoot…

-Jack

 

From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Bryan Hoyer
Sent: Monday, February 1, 2021 09:27
To: udrc@nw-digital-radio.groups.io
Subject: Re: [draws and udrc] Buck converter vs power from Pi question... #12vsupply

 

OK Jack,

 

“Death by Kitty”

 

We don’t resell refurbs, I just keep a few as replacements or Developer give-a-ways.

 

Just toss it, and if you need anything else let me know.

 

73,

Bryan K7UDR



On Jan 31, 2021, at 7:16 PM, Jack Spitznagel <kd4iz@...> wrote:

 

Hi Bryan,

 

Thanks… but this board is the “hulk” of a board you replaced back a while after the problem occurred. The GPS chip and chips around it got very hot after a cat had knocked the GPS puck off the window casing ledge. I noticed after it was too late that the puck rattles – perhaps something got knocked loose. I bought a replacement puck from you, which did not stop the issue. 

 

I pulled the original Pi3B and the old board out the other day and found that the pi will boot (no hat), but will eventually become heat unstable. It would boot (hat on) while powered from the pi, but not when powered from the DRAWS hat. When it booted (with a configured SD card), the GPS is “unreachable” with the new puck attached. (Puck works on another unit.) That section of the board around the GPS chip warms up again, but not like it did for the failure.

 

I’ll be happy to send in the board and if we can figure out whether a refurb is possible, you are welcome to return it to service and resell if you think it is worth the trouble. I have two working systems now so I really don’t know what I would do with a third.

 

Jack Spitznagel – KD4IZ

Cell: (410) 207-5123

<image002.jpg>

Biomedical Consulting Services

 

 

 

From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Bryan Hoyer
Sent: Sunday, January 31, 2021 19:34
To: udrc@nw-digital-radio.groups.io
Subject: Re: [draws and udrc] Buck converter vs power from Pi question... #12vsupply

 

Hey Jack,

 

We have had zero failures in the Buck Converter, except for unfused reverse voltage blowing the protection diode. If you power the Pi separately we use the recommended isolation circuit. In fact, I have hot switched between the 2 supplies without problems.

 

All ICs  on DRAWS, including the GPS, operate on the 3.3V supply, which is provided by the Pi. We have had zero GPS failures, we did have an I2C to serial failure on 1 unit. The GPS receiver is on the I2C serial port.

 

Email me at sales@... and I’ll arrange for a refurb unit for you.

 

73,

Bryan K7UDR




On Jan 24, 2021, at 11:56 AM, Basil Gunn <basil@...> wrote:

 


Hey Jack,

Bryan should comment on this:


after my experience with one of the early experience boards where the
buck converter and the GPS chip got very hot and apparently one or
both failed. Happy to send the hat back for a post-mortem


I have been running multiple different versions of DRAWS boards on 12V
supplies for over a year & I have not seen your symptom. However, I have
a friend who has seen 2 of his RPi/DRAWS units experience much elevated
temperatures. I actually fixed one of his units by updating his kernel &
swapping out one of the heat sinks.

1. I power my RPi/DRAWS units with Alinco DM-330MV power supplies set to
13.8V except for the one I run in my truck.

2. All heat sinks for the RPi are not equal. My experience is that the
super cheap ones (they are all pretty cheap) have inferior thermally
conductive paste.

3. If you have an RPi 4 be sure to run the latest Raspberry Pi OS
package update as that also contains current firmware for the RPi. If
you are seeing temperatures > 80C then you need to update your RPi
firmware.

4. If you are interested in tracking your temperature, graph it out. I
have a repository that plots RPi core temp, ambient temp & CPU activity:

https://github.com/n7nix/rpi-temp-graph

Other:
I supply a script on the NWDR image that displays current RPi core temp
& throttled state. The following script was run on: 
Pi 4 Model B, Rev 1.1, 4GB mem with NO fan.

pi_throt.sh

temp=53.5'C
throttled=0x0

kd4iz de n7nix

Jack Spitznagel <
kd4iz@...> writes:



John, Bryan, and Basil,

Take a look at the close up in
https://nw-digital-radio.groups.io/g/udrc/message/5393. In that set up
am not using 12V through the DRAWS buck converter, rather powering the
whole beast from the Pi4 USB 3. I am still a bit nervous after my
experience with one of the early experience boards where the buck
converter and the GPS chip got very hot and apparently one or both
failed. Happy to send the hat back for a post-mortem (on my dime) if
you think it would be helpful to have a failure analysis. Frankly I
would love to fix it if I can identify the bad chips, but not exactly
sure where to start looking to analyze...

Jack Spitznagel – KD4IZ

Science River LLC

Biomedical Consulting Services





 

 


Re: Buck converter vs power from Pi question... #12vsupply

 

OK Jack,

“Death by Kitty”

We don’t resell refurbs, I just keep a few as replacements or Developer give-a-ways.

Just toss it, and if you need anything else let me know.

73,
Bryan K7UDR

On Jan 31, 2021, at 7:16 PM, Jack Spitznagel <kd4iz@...> wrote:

Hi Bryan,
 
Thanks… but this board is the “hulk” of a board you replaced back a while after the problem occurred. The GPS chip and chips around it got very hot after a cat had knocked the GPS puck off the window casing ledge. I noticed after it was too late that the puck rattles – perhaps something got knocked loose. I bought a replacement puck from you, which did not stop the issue. 
 
I pulled the original Pi3B and the old board out the other day and found that the pi will boot (no hat), but will eventually become heat unstable. It would boot (hat on) while powered from the pi, but not when powered from the DRAWS hat. When it booted (with a configured SD card), the GPS is “unreachable” with the new puck attached. (Puck works on another unit.) That section of the board around the GPS chip warms up again, but not like it did for the failure.
 
I’ll be happy to send in the board and if we can figure out whether a refurb is possible, you are welcome to return it to service and resell if you think it is worth the trouble. I have two working systems now so I really don’t know what I would do with a third.
 
Jack Spitznagel – KD4IZ
Cell: (410) 207-5123
<image002.jpg>
Biomedical Consulting Services
 
 
 
From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Bryan Hoyer
Sent: Sunday, January 31, 2021 19:34
To: udrc@nw-digital-radio.groups.io
Subject: Re: [draws and udrc] Buck converter vs power from Pi question... #12vsupply
 
Hey Jack,
 
We have had zero failures in the Buck Converter, except for unfused reverse voltage blowing the protection diode. If you power the Pi separately we use the recommended isolation circuit. In fact, I have hot switched between the 2 supplies without problems.
 
All ICs  on DRAWS, including the GPS, operate on the 3.3V supply, which is provided by the Pi. We have had zero GPS failures, we did have an I2C to serial failure on 1 unit. The GPS receiver is on the I2C serial port.
 
Email me at sales@... and I’ll arrange for a refurb unit for you.
 
73,
Bryan K7UDR


On Jan 24, 2021, at 11:56 AM, Basil Gunn <basil@...> wrote:
 

Hey Jack,

Bryan should comment on this:

after my experience with one of the early experience boards where the
buck converter and the GPS chip got very hot and apparently one or
both failed. Happy to send the hat back for a post-mortem

I have been running multiple different versions of DRAWS boards on 12V
supplies for over a year & I have not seen your symptom. However, I have
a friend who has seen 2 of his RPi/DRAWS units experience much elevated
temperatures. I actually fixed one of his units by updating his kernel &
swapping out one of the heat sinks.

1. I power my RPi/DRAWS units with Alinco DM-330MV power supplies set to
13.8V except for the one I run in my truck.

2. All heat sinks for the RPi are not equal. My experience is that the
super cheap ones (they are all pretty cheap) have inferior thermally
conductive paste.

3. If you have an RPi 4 be sure to run the latest Raspberry Pi OS
package update as that also contains current firmware for the RPi. If
you are seeing temperatures > 80C then you need to update your RPi
firmware.

4. If you are interested in tracking your temperature, graph it out. I
have a repository that plots RPi core temp, ambient temp & CPU activity:

https://github.com/n7nix/rpi-temp-graph

Other:
I supply a script on the NWDR image that displays current RPi core temp
& throttled state. The following script was run on: 
Pi 4 Model B, Rev 1.1, 4GB mem with NO fan.

pi_throt.sh

temp=53.5'C
throttled=0x0

kd4iz de n7nix

Jack Spitznagel <
kd4iz@...> writes:


John, Bryan, and Basil,

Take a look at the close up in
https://nw-digital-radio.groups.io/g/udrc/message/5393. In that set up
am not using 12V through the DRAWS buck converter, rather powering the
whole beast from the Pi4 USB 3. I am still a bit nervous after my
experience with one of the early experience boards where the buck
converter and the GPS chip got very hot and apparently one or both
failed. Happy to send the hat back for a post-mortem (on my dime) if
you think it would be helpful to have a failure analysis. Frankly I
would love to fix it if I can identify the bad chips, but not exactly
sure where to start looking to analyze...

Jack Spitznagel – KD4IZ

Science River LLC

Biomedical Consulting Services



 



Re: #support Input for getting starting instructions #support

 

Yes Raspberry Pi Foundation has its own imager now, for Windows, MacOS, and Linux  -- see https://www.raspberrypi.org/software/

On Sun, Jan 31, 2021 at 7:33 PM Steve Stroh <steve.stroh@...> wrote:
In Getting Started, the instructions state that Mac users must
download and use a dedicated unarchive utility. That doesn't seem to
be the case. I downloaded the .xz file, double clicked on it, and a
utility called Archive Utility (copyright Apple) fired up and began
unarchiving the .xz file. After a few minutes a .img file was in the
same folder.

On the Mac, my favorite write image to SD card is the one provided by
Raspberry Pi called Raspberry Pi Imager. It's very straightforward and
easy to use.

Thanks,

Steve Stroh N8GNJ--
Steve Stroh (personal / general): stevestroh@...



--
John D. Hays
Kingston, WA
K7VE

 


#support Input for getting starting instructions #support

Steve Stroh
 

In Getting Started, the instructions state that Mac users must
download and use a dedicated unarchive utility. That doesn't seem to
be the case. I downloaded the .xz file, double clicked on it, and a
utility called Archive Utility (copyright Apple) fired up and began
unarchiving the .xz file. After a few minutes a .img file was in the
same folder.

On the Mac, my favorite write image to SD card is the one provided by
Raspberry Pi called Raspberry Pi Imager. It's very straightforward and
easy to use.

Thanks,

Steve Stroh N8GNJ--
Steve Stroh (personal / general): stevestroh@...


Re: Buck converter vs power from Pi question... #12vsupply

Jack Spitznagel
 

Hi Bryan,

 

Thanks… but this board is the “hulk” of a board you replaced back a while after the problem occurred. The GPS chip and chips around it got very hot after a cat had knocked the GPS puck off the window casing ledge. I noticed after it was too late that the puck rattles – perhaps something got knocked loose. I bought a replacement puck from you, which did not stop the issue.

 

I pulled the original Pi3B and the old board out the other day and found that the pi will boot (no hat), but will eventually become heat unstable. It would boot (hat on) while powered from the pi, but not when powered from the DRAWS hat. When it booted (with a configured SD card), the GPS is “unreachable” with the new puck attached. (Puck works on another unit.) That section of the board around the GPS chip warms up again, but not like it did for the failure.

 

I’ll be happy to send in the board and if we can figure out whether a refurb is possible, you are welcome to return it to service and resell if you think it is worth the trouble. I have two working systems now so I really don’t know what I would do with a third.

 

Jack Spitznagel – KD4IZ

Cell: (410) 207-5123

Biomedical Consulting Services

 

 

 

From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Bryan Hoyer
Sent: Sunday, January 31, 2021 19:34
To: udrc@nw-digital-radio.groups.io
Subject: Re: [draws and udrc] Buck converter vs power from Pi question... #12vsupply

 

Hey Jack,

 

We have had zero failures in the Buck Converter, except for unfused reverse voltage blowing the protection diode. If you power the Pi separately we use the recommended isolation circuit. In fact, I have hot switched between the 2 supplies without problems.

 

All ICs  on DRAWS, including the GPS, operate on the 3.3V supply, which is provided by the Pi. We have had zero GPS failures, we did have an I2C to serial failure on 1 unit. The GPS receiver is on the I2C serial port.

 

Email me at sales@... and I’ll arrange for a refurb unit for you.

 

73,

Bryan K7UDR



On Jan 24, 2021, at 11:56 AM, Basil Gunn <basil@...> wrote:

 


Hey Jack,

Bryan should comment on this:

after my experience with one of the early experience boards where the
buck converter and the GPS chip got very hot and apparently one or
both failed. Happy to send the hat back for a post-mortem


I have been running multiple different versions of DRAWS boards on 12V
supplies for over a year & I have not seen your symptom. However, I have
a friend who has seen 2 of his RPi/DRAWS units experience much elevated
temperatures. I actually fixed one of his units by updating his kernel &
swapping out one of the heat sinks.

1. I power my RPi/DRAWS units with Alinco DM-330MV power supplies set to
13.8V except for the one I run in my truck.

2. All heat sinks for the RPi are not equal. My experience is that the
super cheap ones (they are all pretty cheap) have inferior thermally
conductive paste.

3. If you have an RPi 4 be sure to run the latest Raspberry Pi OS
package update as that also contains current firmware for the RPi. If
you are seeing temperatures > 80C then you need to update your RPi
firmware.

4. If you are interested in tracking your temperature, graph it out. I
have a repository that plots RPi core temp, ambient temp & CPU activity:

https://github.com/n7nix/rpi-temp-graph

Other:
I supply a script on the NWDR image that displays current RPi core temp
& throttled state. The following script was run on: 
Pi 4 Model B, Rev 1.1, 4GB mem with NO fan.

pi_throt.sh

temp=53.5'C
throttled=0x0

kd4iz de n7nix

Jack Spitznagel <
kd4iz@...> writes:


John, Bryan, and Basil,

Take a look at the close up in
https://nw-digital-radio.groups.io/g/udrc/message/5393. In that set up
am not using 12V through the DRAWS buck converter, rather powering the
whole beast from the Pi4 USB 3. I am still a bit nervous after my
experience with one of the early experience boards where the buck
converter and the GPS chip got very hot and apparently one or both
failed. Happy to send the hat back for a post-mortem (on my dime) if
you think it would be helpful to have a failure analysis. Frankly I
would love to fix it if I can identify the bad chips, but not exactly
sure where to start looking to analyze...

Jack Spitznagel – KD4IZ

Science River LLC

Biomedical Consulting Services




 


Re: Buck converter vs power from Pi question... #12vsupply

 

Hey Jack,

We have had zero failures in the Buck Converter, except for unfused reverse voltage blowing the protection diode. If you power the Pi separately we use the recommended isolation circuit. In fact, I have hot switched between the 2 supplies without problems.

All ICs  on DRAWS, including the GPS, operate on the 3.3V supply, which is provided by the Pi. We have had zero GPS failures, we did have an I2C to serial failure on 1 unit. The GPS receiver is on the I2C serial port.

Email me at sales@... and I’ll arrange for a refurb unit for you.

73,
Bryan K7UDR

On Jan 24, 2021, at 11:56 AM, Basil Gunn <basil@...> wrote:


Hey Jack,

Bryan should comment on this:
after my experience with one of the early experience boards where the
buck converter and the GPS chip got very hot and apparently one or
both failed. Happy to send the hat back for a post-mortem

I have been running multiple different versions of DRAWS boards on 12V
supplies for over a year & I have not seen your symptom. However, I have
a friend who has seen 2 of his RPi/DRAWS units experience much elevated
temperatures. I actually fixed one of his units by updating his kernel &
swapping out one of the heat sinks.

1. I power my RPi/DRAWS units with Alinco DM-330MV power supplies set to
13.8V except for the one I run in my truck.

2. All heat sinks for the RPi are not equal. My experience is that the
super cheap ones (they are all pretty cheap) have inferior thermally
conductive paste.

3. If you have an RPi 4 be sure to run the latest Raspberry Pi OS
package update as that also contains current firmware for the RPi. If
you are seeing temperatures > 80C then you need to update your RPi
firmware.

4. If you are interested in tracking your temperature, graph it out. I
have a repository that plots RPi core temp, ambient temp & CPU activity:

https://github.com/n7nix/rpi-temp-graph

Other:
I supply a script on the NWDR image that displays current RPi core temp
& throttled state. The following script was run on: 
Pi 4 Model B, Rev 1.1, 4GB mem with NO fan.

pi_throt.sh

temp=53.5'C
throttled=0x0

kd4iz de n7nix

Jack Spitznagel <kd4iz@...> writes:

John, Bryan, and Basil,

Take a look at the close up in
https://nw-digital-radio.groups.io/g/udrc/message/5393. In that set up
am not using 12V through the DRAWS buck converter, rather powering the
whole beast from the Pi4 USB 3. I am still a bit nervous after my
experience with one of the early experience boards where the buck
converter and the GPS chip got very hot and apparently one or both
failed. Happy to send the hat back for a post-mortem (on my dime) if
you think it would be helpful to have a failure analysis. Frankly I
would love to fix it if I can identify the bad chips, but not exactly
sure where to start looking to analyze...

Jack Spitznagel – KD4IZ

Science River LLC

Biomedical Consulting Services




Re: app_config.sh core

Steve, N9VW
 

Great, thanks Basil...!

/SvW

On 1/31/2021 4:12 PM, Basil Gunn wrote:
Yes, thanks I confirmed this problem in NWDR19. The /etc/ax25/port.conf
file contains the two AX.25 IP addresses. If you need to change them
just edit that file. The app_config.sh core script should be fixed with
a recent commit.

1. Work around is to edit /etc/ax25/port.conf and run ax25-restart
2. core_config.sh script fixed ip_address problem with this commit:
https://github.com/nwdigitalradio/n7nix/commit/fe73b4c57d1e01ef74f8a0d1a644d91807452845

To get latest commit:
cd
cd n7nix
git pull
cd config
./bin_refresh.sh


Steve, N9VW <steve@vanwambeck.net> writes:

Basil,
You may not recall but early on with the DRAWS board I discovered an
issue with the script not setting the IP addresses that the user
selected. It always reverted back to 192.168.... default addresses. You
found the issue somewhere back in release 11 or so where after running
the user setup the next command wrote over it with the defaults. It's
back...

Screen captures of the sessions:

=== Set ip addresses on AX.25 interfaces
Current AX.25 ip addresses: ax0: 192.168.255.2, ax1: 192.168.255.3
If you do not understand or care about the following just hit enter
for default values
Enter ip address for AX.25 interface ax0 followed by [enter]:
172.24.54.2
Verifying ip address: 172.24.54.2
Verifying ip address ret: 0
Valid ip address: 172.24.54.2
Setting ax0 to 172.24.54.2
Enter ip address for AX.25 interface ax1 followed by [enter]:
172.24.54.3
Verifying ip address: 172.24.54.3
Verifying ip address ret: 0
Valid ip address: 172.24.54.3
Setting ax1 to 172.24.54.3

before:

ax25_ipaddr[0]="192.168.255.2"
ax25_ipaddr[1]="192.168.255.3"

after:

ax25_ipaddr[0]="172.24.54.2"
ax25_ipaddr[1]="172.24.54.3"
=== FINISHED Setting up ip addresses for AX.25 interfaces
200 OK
2021 01 30 18:43:31 PST: app_config.sh: core config script FINISHED



Rebooted:
Enabled AX25
Rebooted:

pi@DRAWS-1:~ $ ax25-status
Status for direwolf.service: RUNNING and ENABLED
Status for ax25dev.service: RUNNING and ENABLED
Status for ax25dev.path: RUNNING and ENABLED
Status for ax25-mheardd.service: RUNNING and ENABLED
Status for ax25d.service: RUNNING and ENABLED
AX.25 device: ax0 successfully configured with ip: 192.168.255.2
AX.25 device: ax1 successfully configured with ip: 192.168.255.3
Direwolf is running with pid of 538
port: 0, speed: 1200, slottime: 200, txdelay: 500, t1 timeout: 3000,
t2 timeout: 1000
port: 1, speed: 1200, slottime: 200, txdelay: 500, t1 timeout: 3000,
t2 timeout: 1000
Device: ax0 exists, Device: ax1 exists

Happy Trails,
Steve, N9VW




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