Re: [weewx-user] Weewx on RPi Zero

[Les Niles]

Likewise — I have an RTC but no UPS on an RPi 3, and have zero problems with 
data loss or corruption due to power failures from a few seconds to several 
days in duration.  The only issue is if the RPi is down for the 10-15 days that 
it takes the Davis logger’s memory to overflow.  

Going back to the original question on this thread, the RTC should work just as 
easily with a Pi Zero as with a full-sized Raspberry Pi. IIRC the RTC module is 
about $4 so not a huge expense.

  -Les

> On 19 Nov 2019, at 10:35, Andrew Milner  wrote:
> 
> for what it is worth I do not use a UPS - and we get frequent power outages 
> here.  I do use a usb hard drive though instead of the SD card on my rpi.  
> Weewx has always recovered the data from my current davis and my earlier 
> fineoffset without any issues, so i see no need for a ups.  Anyways sometimes 
> our outages are for 3,4,5 hours so it is doubtful the ups would keep things 
> running anyway even if I had one.  I do have an RTC installed to make sure 
> there are no hiccups in recovering the data from the station logger though!!
> 
> 
> 
> On Tuesday, 19 November 2019 20:18:46 UTC+2, David VE3STI wrote:
> Susan: Do you have a Davis system? The reason I ask is that, from my reading 
> of the comments over the last few years, this 'argument' between the RPi 
> starting up and the weather station hardware may be limited to the Davis 
> systems with their logging interface. Would you be willing to share your 
> coding/scripts/etc with the rest of us? Although I have added an RTC and a 
> UPS, I wish that my system was robust enough to reliably deal with power 
> interruptions without these additions. (The RTC and UPS cost more than the 
> RPi!)
> 
> David
> 
> On Mon, 18 Nov 2019 at 21:32, Susan Mackay > wrote:
> I use an RPi Zero W for Weewx and Nginx as well.
> I use systemd to manage it and have pre-requisites that the 'ntp.service' and 
> 'time-sync.service' have completed before it will start.
> Susan
> 
> On Monday, November 18, 2019 at 11:52:38 PM UTC+11, David VE3STI wrote:
> The problems occur during the startup, before the RPi sets its clock from the 
> Internet, and appear to be issues with the RPi and the Davis equipment 
> disagreeing on the time and getting muddled. It has been the topic of much 
> discussion and you can read the gory details in the wiki. I won't go into the 
> details here. If you have a UPS and rarely reboot, it becomes almost a 
> non-issue.
> 
> David
> 
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Re: [weewx-user] Weewx on RPi Zero

[vince]

On Monday, November 18, 2019 at 6:39:32 AM UTC-8, Thomas Keffer wrote:

> Upgrading operating systems can definitely help. Upgrading my OS from 
> Debian 9.8 to 9.11 fixed my problem.
>
>
>
FWIW, I recently instrumented my 4.0b1 pi4 running current Raspbian based 
on 10.0 and see 'no' memory leak in almost a day of uptime. 

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Re: [weewx-user] Weewx on RPi Zero

[Thomas Keffer]

Yes. See PR #467 , to appear in
V4.0.

-tk

On Mon, Nov 18, 2019 at 9:26 AM Leon Shaner  wrote:

> Tom,
>
> Did I also see a reference to refactoring some SQL connection code, also
> having a positive effect on the memory leak?
>
> Regards,
> \Leon
>
> Thomas Keffer wrote:
>
> Only issue is the rampant memory leak plaguing many will manifest more
>> frequently on a RPI Zero W because it only has 512MB RAM.  Hopefully the
>> leak will be fixed soon.
>>
>
> Just for the record: the leak is in the underlying Debian drivers or,
> possibly, Python 2.7 --- not in WeeWX.
>
> Upgrading operating systems can definitely help. Upgrading my OS from
> Debian 9.8 to 9.11 fixed my problem.
>
> -tk
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> 
> .
>
>
>
> -- l...@isylum.org - Dearborn, Michigan
>
>

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Re: [weewx-user] Weewx on RPi Zero

[Leon Shaner]

Tom,

Did I also see a reference to refactoring some SQL connection code, also 
having a positive effect on the memory leak?


Regards,
\Leon

Thomas Keffer wrote:


Only issue is the rampant memory leak plaguing many will manifest
more frequently on a RPI Zero W because it only has 512MB RAM. 
Hopefully the leak will be fixed soon.


Just for the record: the leak is in the underlying Debian drivers or, 
possibly, Python 2.7 --- not in WeeWX.


Upgrading operating systems can definitely help. Upgrading my OS from 
Debian 9.8 to 9.11 fixed my problem.


-tk
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Re: [weewx-user] Weewx on RPi Zero

[Thomas Keffer]

>
> Only issue is the rampant memory leak plaguing many will manifest more
> frequently on a RPI Zero W because it only has 512MB RAM.  Hopefully the
> leak will be fixed soon.
>

Just for the record: the leak is in the underlying Debian drivers or,
possibly, Python 2.7 --- not in WeeWX.

Upgrading operating systems can definitely help. Upgrading my OS from
Debian 9.8 to 9.11 fixed my problem.

-tk

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Re: [weewx-user] Weewx on RPi Zero

[Leon Shaner]

Runs great on my RPI Zero W(H).
Only issue is the rampant memory leak plaguing many will manifest more 
frequently on a RPI Zero W because it only has 512MB RAM.  Hopefully the leak 
will be fixed soon.

Regards,
\Leon
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Leon Shaner :: Dearborn, Michigan (iPhone)

> On Nov 18, 2019, at 12:09 AM, peter  wrote:
> 
> Does weewx run OK on RPi Zero W? I want to connect a Vantage Envoy to the 
> USB-on-the-go port.
> Thanks!
> 
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[weewx-user] Weewx on RPi Zero

[peter]

Does weewx run OK on RPi Zero W? I want to connect a Vantage Envoy to the 
USB-on-the-go port.
Thanks!

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