Date   

Re: DRAWS GPS Altitude limit #draws #gps

 

We are using the S1216F8-GL

Datasheet:



On Dec 17, 2018, at 7:37 PM, Brian Badger <brian@...> wrote:

I don’t know the exact model used but the S1216 GNSS module datasheet says that it will support <18000m OR <515 m/s.  “Either may be exceeded but not both”

Brian N0KZ 


On Dec 17, 2018, at 7:02 PM, Craig Baker, KF7LLA <kf7lla@...> wrote:

Having done a HAB project, we used a Big Red Bee as our primary tracker and were experimenting with the Trackuino (https://github.com/trackuino) that uses the SparkFun GPS-11058 (https://www.sparkfun.com/products/retired/11058).  I'm not sure what the replacement is for the GPS-11058, as that's discontinued, but there should be a newer version that still supports the OR condition.

Craig / KF7LLA


Re: (longer) DRAWS power cable? #draws #power

 

Yes Brian, you are correct.

We are finalizing a case design now. Details shortly.

Bryan K7UDR


Re: ARDOP on the DRAWS

Ed Bloom, KD9FRQ
 

NEVER MIND!!!  I overlooked ARDOP in the list.....
 
But does not answer the second question.....Does the Compass load have ARDOP loaded
and ready to use?
 
Ed Bloom
ewbloom@...
Sent from Webmail access
 
 

-----Original Message-----
From: Ed Bloom, KD9FRQ <ewbloom@...>
To: udrc <udrc@nw-digital-radio.groups.io>
Sent: Tue, Dec 18, 2018 7:22 am
Subject: [udrc] ARDOP on the DRAWS

Is the DRAWS hat capable to run ARDOP?
 
If so, does the Compass load have ARDOP loaded? 
 
Ed Bloom, KD9FRQ
ewbloom@...
Sent from Webmail access


ARDOP on the DRAWS

Ed Bloom, KD9FRQ
 

Is the DRAWS hat capable to run ARDOP?
 
If so, does the Compass load have ARDOP loaded? 
 
Ed Bloom, KD9FRQ
ewbloom@...
Sent from Webmail access


Re: DRAWS RTC

Art - KC7SDA
 

ah ok, thats the part I was missing, I thought it was a module that had to be loaded like adafruits tutorial on adding rtc's.

I guess I better buy a bunch of the backup batteries then! I had one setup that its battery lasted months before I had to replace it!


Re: (longer) DRAWS power cable? #draws #power

Budd Churchward
 

While you are at it, don’t forget to include a fuse in the line. Like the UDRCs that preceded it, the DRAWS board uses a diode across the input voltage and ground for reverse polarity protection which simply explodes micro-seconds before it fries the board unless you have a fuse. Ask me how I know. Ask Anna. We’ve seen fire. As the saying goes: “It stops working when you let the magic smoke out.”
 
Budd WB7FHC
 

Sent: Saturday, December 15, 2018 3:55 PM
Subject: Re: [udrc] (longer) DRAWS power cable? #draws #power
 
John,
 
Thanks for the input.  I am pretty much a rank amateur on the hardware side of things.  I've already managed loose an inch or more off the pigtails trying to put some Anderson Power Poles on them.  Hadn't occurred to me to simply solder longer wires to the pigtails.  I assume that I could go to a larger gauge of wire which would allow me to have a somewhat more robust termination to the connectors I want to try.  That 28 gauge wire in the pigtails is awfully fragile to a fumble thumbs like me.
 
If you have a part number for the pig tails and a source I'd appreciate hearing more from you.
 
Gayland
KG7GCF
 
 
On Sat, Dec 15, 2018 at 2:45 PM John D Hays - K7VE <john@...> wrote:
Be careful to get the right polarity, to match the pins on the DRAWS board.  We have seen some with the black and red wires switched from what DRAWS is expecting.

We are looking at some options, so don't overdo it on buying a bunch of pigtails.

BTW, pigtails are meant to be just that, a little solder and shrink tubing and connect it to a longer cable with whatever connector you like on the other end.
 
 
 
On Sat, Dec 15, 2018 at 2:15 PM Robert Sears <kf7vop@...> wrote:

Complete assemblies

https://www.adafruit.com/product/261

https://www.sparkfun.com/products/9914

Robert/KF7VOP

On 12/15/2018 09:53 AM, Gayland Gump wrote:
Does anyone have a source for the power pigtails for the DRAWS?  I'll likely need a few as I learn how to put Anderson Power Pole connectors on the non-terminated end of the pigtail.  The one I got with the DRAWS is already getting too short as I fail my way through to having enough experience and technique to achieve success.
 
Gayland
KG7GCF
 
 
On Thu, Dec 6, 2018 at 10:57 AM Bryan Hoyer <bhhoyer@...> wrote:
Connector is JST XRH Series

> On Dec 6, 2018, at 10:38 AM, Steve Stroh <steve.stroh@...> wrote:
>
> Anyone have a lead on a longer power cable for a DRAWS?
>
> Yes, I know I can splice a longer cable onto the one that's supplied
> with the unit, but I'd rather not.
>
> I'm sure there's something on Amazon, but I don't even know what to
> call that particular connector.
>
> Thanks,
>
> Steve N8GNJ
>
> --
> Steve Stroh (personal / general): stevestroh@...
>
>
>




 
 
--


John D. Hays
Edmonds, WA
K7VE

   
 


Re: DRAWS GPS Altitude limit #draws #gps

Brian Badger
 

I don’t know the exact model used but the S1216 GNSS module datasheet says that it will support <18000m OR <515 m/s.  “Either may be exceeded but not both”

Brian N0KZ 


On Dec 17, 2018, at 7:02 PM, Craig Baker, KF7LLA <kf7lla@...> wrote:

Having done a HAB project, we used a Big Red Bee as our primary tracker and were experimenting with the Trackuino (https://github.com/trackuino) that uses the SparkFun GPS-11058 (https://www.sparkfun.com/products/retired/11058).  I'm not sure what the replacement is for the GPS-11058, as that's discontinued, but there should be a newer version that still supports the OR condition.

Craig / KF7LLA


Re: DRAWS RTC

 

The rtc is part of the GPS, it is set by the GPS and it will provide time when trhhe GPS is not receiving. The battery will keep the clock active for a cumalative 40 days when power is removed from DRAWS. 


On Mon, Dec 17, 2018, 17:25 Art - KC7SDA <nouse4anick@... wrote:
So, here is my config for chrony:

pool 2.debian.pool.ntp.org iburst
keyfile /etc/chrony/chrony.keys
driftfile /var/lib/chrony/chrony.drift
logdir /var/log/chrony
maxupdateskew 100.0
makestep 1 3
refclock SHM 0 refid GPS precision 1e-3 offset 0.5 delay 0.2 poll 3 trust require
refclock SHM 2 refid PPS precision 1e-9 poll 3 trust

What should I add to make it use the hardware RTC as a fallback? The only experience I've had with RTC clocks is adafruit's i2c expansion cards.

Thanks
Art


Re: DRAWS GPS Altitude limit #draws #gps

 

Having done a HAB project, we used a Big Red Bee as our primary tracker and were experimenting with the Trackuino (https://github.com/trackuino) that uses the SparkFun GPS-11058 (https://www.sparkfun.com/products/retired/11058).  I'm not sure what the replacement is for the GPS-11058, as that's discontinued, but there should be a newer version that still supports the OR condition.

Craig / KF7LLA


Re: DRAWS GPS Altitude limit #draws #gps

Dave N2OA
 

I’m guessing that you have no idea why I asked. COCOM, which deals with export limits has a regulation stating that a GPS must shutdown if the speed exceeds 1000 knots OR 18km altitude. Many manufacturers implement this as an and rather than an or condition making it useless for high altitude balloons. 

Dave
N2OA 


On Dec 17, 2018, at 7:58 PM, Patrick - KJ4MUB <ptwaugh@...> wrote:

Yes.  Do not go above the GPS satellites. Lol

Patrick Waugh, M.A., #123263
Probation & Parole Officer II
District 21 Field Office - Branson
(417) 239-3274 Direct
(417) 337-8310 Fax


On Dec 17, 2018, at 09:02, Dave N2OA <kdcarlso@...> wrote:

I'm looking into launching a high altitude balloon for one of the local schools and am considering using the DRAWS platform for APRS and data. Is there a altitude limitation on the GPS used?

Thanks,

Dave
N2OA


DRAWS RTC

Art - KC7SDA
 

So, here is my config for chrony:

pool 2.debian.pool.ntp.org iburst
keyfile /etc/chrony/chrony.keys
driftfile /var/lib/chrony/chrony.drift
logdir /var/log/chrony
maxupdateskew 100.0
makestep 1 3
refclock SHM 0 refid GPS precision 1e-3 offset 0.5 delay 0.2 poll 3 trust require
refclock SHM 2 refid PPS precision 1e-9 poll 3 trust

What should I add to make it use the hardware RTC as a fallback? The only experience I've had with RTC clocks is adafruit's i2c expansion cards.

Thanks
Art


Re: DRAWS GPS Altitude limit #draws #gps

Patrick - KJ4MUB <ptwaugh@...>
 

Yes.  Do not go above the GPS satellites. Lol

Patrick Waugh, M.A., #123263
Probation & Parole Officer II
District 21 Field Office - Branson
(417) 239-3274 Direct
(417) 337-8310 Fax


On Dec 17, 2018, at 09:02, Dave N2OA <kdcarlso@...> wrote:

I'm looking into launching a high altitude balloon for one of the local schools and am considering using the DRAWS platform for APRS and data. Is there a altitude limitation on the GPS used?

Thanks,

Dave
N2OA


Re: Compatible case, heat sink, and fans?

Patrick - KJ4MUB <ptwaugh@...>
 

And it would NOT apply to a Pi 3B+, which is what we are talking about.  Further, I have conducted my own measurements, and you should too. 

If you don't care about performance and heat injury to your components, then nope it's not for you.  But, indeed if you do not cool your Pi 3B+, you will not maximize performance and life. 

I prefer to run fully protected even at 100% duty cycle.

Patrick Waugh, M.A., #123263



On Dec 17, 2018, at 14:39, Fred Meier <fsmeier@...> wrote:

Here is a link to a great micro study that substantiates Mr. Sears assertion that a heatsink helps you feel better but probably won’t materially benefit the RPi- http://www.raspberryconnect.com/miscellaneous/item/317-raspberry-pi-cooling-cpu-heatsinks-do-you-need-them

 

From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Robert Sears
Sent: Monday, December 17, 2018 10:35 AM
To: udrc@nw-digital-radio.groups.io
Subject: Re: [udrc] Compatible case, heat sink, and fans?

 

Meh... sure it makes us feel better when the CPU is running at 55c versus 60c, but what is really the benefit? 

I mean sure we can argue reliability and longevity all day long but honestly you are talking about a ten year lifespan versus an eleven year lifespan.

Will you even care about a Raspberry Pi ten years or eleven from now?

The Broadcom BCM2837 itself runs about 20 degrees cooler in CPU intensive benchmarks compared to the Broadcom BCM2836 that the Pi-3 used just due to the integrated heatsink and improved board layout on the Pi-3B+

<image001.jpg><image002.jpg>


Re: Compatible case, heat sink, and fans?

Patrick - KJ4MUB <ptwaugh@...>
 

If you don't mind lower performance in 2 mins flat.  If you use science and data, and MEASURE the CPU temperature you will soon see you in fact need them. 

Patrick Waugh, M.A., #123263
Probation & Parole Officer II
District 21 Field Office - Branson
(417) 239-3274 Direct
(417) 337-8310 Fax


On Dec 17, 2018, at 18:48, Patrick Waugh <ptwaugh@...> wrote:

What humor?

Patrick Waugh, M.A., #123263


On Dec 17, 2018, at 10:53, Robert Sears <kf7vop@...> wrote:

I don't see the need for a fan on a R-Pi,  even a heatsink is not really necessary.

You are limited by the Pi-Hat as far as heat sink height.
 


Re: Compatible case, heat sink, and fans?

Patrick - KJ4MUB <ptwaugh@...>
 

There is definitely a need for BOTH a heat sink and a fan.  The Pi reaches critical temperatures within about 2 mins without.  


On Dec 17, 2018, at 18:48, Patrick Waugh <ptwaugh@...> wrote:

What humor?

Patrick Waugh, M.A., #123263


On Dec 17, 2018, at 10:53, Robert Sears <kf7vop@...> wrote:

I don't see the need for a fan on a R-Pi,  even a heatsink is not really necessary.

You are limited by the Pi-Hat as far as heat sink height.
 


Re: Compatible case, heat sink, and fans?

Patrick - KJ4MUB <ptwaugh@...>
 

What humor?

Patrick Waugh, M.A., #123263


On Dec 17, 2018, at 10:53, Robert Sears <kf7vop@...> wrote:

I don't see the need for a fan on a R-Pi,  even a heatsink is not really necessary.

You are limited by the Pi-Hat as far as heat sink height.
 


Re: Compatible case, heat sink, and fans?

Fred Meier <fsmeier@...>
 

Here is a link to a great micro study that substantiates Mr. Sears assertion that a heatsink helps you feel better but probably won’t materially benefit the RPi- http://www.raspberryconnect.com/miscellaneous/item/317-raspberry-pi-cooling-cpu-heatsinks-do-you-need-them

 

From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Robert Sears
Sent: Monday, December 17, 2018 10:35 AM
To: udrc@nw-digital-radio.groups.io
Subject: Re: [udrc] Compatible case, heat sink, and fans?

 

Meh... sure it makes us feel better when the CPU is running at 55c versus 60c, but what is really the benefit? 

I mean sure we can argue reliability and longevity all day long but honestly you are talking about a ten year lifespan versus an eleven year lifespan.

Will you even care about a Raspberry Pi ten years or eleven from now?

The Broadcom BCM2837 itself runs about 20 degrees cooler in CPU intensive benchmarks compared to the Broadcom BCM2836 that the Pi-3 used just due to the integrated heatsink and improved board layout on the Pi-3B+


Re: Compatible case, heat sink, and fans?

Kenny Richards
 

I think there are valid points raised by people in this thread, so I just want to share some personal experience. I ran a Pi for months as a repeater controller on the bench and eventually in my garage while waiting to move it to a hill top site. Never had a problem with the entire setup once it was dialed in. Then over the summer I started experiencing regular reboots that I couldn't explain. Ultimately I realized out the temp in side the building on the hill was about 15-20 degrees warmer than my shack or garage. Adding an additional fan solved the problem and according to the metrics, it dropped the CPU temp down about 10 degrees. Now that winter is here, the fan isn't running at all and no reboot problems.

I suspect most of us don't need a heat sink or fan for their UDRC/HATS enabled Pi. But there are situations where it might be necessary given environmental circumstances.

73,
Kenny


Re: Compatible case, heat sink, and fans?

Robert Sears
 

Meh... sure it makes us feel better when the CPU is running at 55c versus 60c, but what is really the benefit? 

I mean sure we can argue reliability and longevity all day long but honestly you are talking about a ten year lifespan versus an eleven year lifespan.

Will you even care about a Raspberry Pi ten years or eleven from now?

The Broadcom BCM2837 itself runs about 20 degrees cooler in CPU intensive benchmarks compared to the Broadcom BCM2836 that the Pi-3 used just due to the integrated heatsink and improved board layout on the Pi-3B+


Re: Compatible case, heat sink, and fans?

Ed Bloom, KD9FRQ
 

I, too, am a fan of cooling.  I have the extend cases with fans for my PiGate and PiGate RMS boxes using the Pi-TNC.
 
I was hoping the DRAWS would come with the riser pins to I could add the 3.5" screen on top instead of routing the thin cable under and around or needing to use the HDMI port.
 
Ed Bloom, KD9FRQ
ewbloom@...
Sent from Webmail access
 
 

-----Original Message-----
From: Fred Meier <fsmeier@...>
To: udrc <udrc@nw-digital-radio.groups.io>
Sent: Mon, Dec 17, 2018 12:09 pm
Subject: Re: [udrc] Compatible case, heat sink, and fans?

IMHO, every microprocessor benefits from improved cooling. The more the processors are enclosed in cases and by add ons, the more important supplemental cooling becomes.
 
From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Robert Sears
Sent: Monday, December 17, 2018 8:53 AM
To: udrc@nw-digital-radio.groups.io
Subject: Re: [udrc] Compatible case, heat sink, and fans?
 
[Edited Message Follows]
I don't see the need for a fan on a R-Pi,  even the need for a heatsink is debatable.

You are limited by the Pi-Hat as far as heat sink height.