Re: [Owfs-developers] unruly temperatures - Vol 100, Issue 6

2014-09-14 Thread Loren Amelang
Hakan,

I had an episode (on a BBB with I2C connection) where for a couple of weeks
the temperature resolution would randomly drop from 12-bit to 1/2 degree C.
Looking at the owserver presentation of all of the various bit resolutions,
sometimes the lower resolutions were not proper representations of the
higher-bit values. I couldn't tell if some values were delayed, or just
plain offset, but depending on which resolution happened to get written into
my filesystem where my logger reads them, the temperature could appear to
jump by 1/2 degree. I verified that the values in the filesystem files were
being logged correctly. It would happen for a few minutes or a few hours,
and then fix itself. And then without me doing anything at all, it just
stopped happening!

Looking at your graph, it appears you usually get full resolution gradual
changes on either side of your 1/2 degree steps. My graphs were always more
like the later part of your blue line - chattering by 1/2 degree where there
should have been a smooth transition.

I have no clues why this started or stopped...

| Loren Amelang | lo...@pacific.net |


On Saturday, September 13, 2014 at 10:29 PM,
owfs-developers-requ...@lists.sourceforge.net wrote:


> 1. unruly temperatures (H?kan Elmqvist)
>
> --
>
> Message: 1
> Date: Fri, 12 Sep 2014 17:18:53 +0200
> From: H?kan Elmqvist 
> Subject: [Owfs-developers] unruly temperatures
> To: "OWFS (One-wire file system) discussion and help"
> 
> Message-ID: <54130edd.5070...@smeden.org>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Suddenly my temperature readings have started to jump up and down about
> 0.5 degree C at infrequent but random points of time. See:
> http://smeden.org/jumps.jpg
> (the green trace is the temperature of my watermaker, the blue sea- and
> the red outdoor-temperature)
> I have had this system since 2005 but not seen this behaviour before.
> Today I am using owfs 2.9p5. The sensors are a mix of old and new ones.
> Has anyone seen this behaviour? Is there any explanation?




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Re: [Owfs-developers] unruly temperatures

2014-09-14 Thread Gregg Levine
Hello!
Normally I would say one thing, "Of course it does, I arranged it.",
but under the circumstances, there are a lot of reasons why its doing
that.

Besides it was arranged that way.

Seriously? Lots of reasons, look for an open line someplace.
-
Gregg C Levine gregg.drw...@gmail.com
"This signature fought the Time Wars, time and again."


On Sun, Sep 14, 2014 at 12:48 PM, Martin Patzak (GMX)
 wrote:
> Well, I guess then it is NOT a software bug then... ;o)
> It for sure looked like one...
>
> Would be interesting to understand why it results in this weird behaviour!
>
> Cheers,
>
> Martin
>
>
> On 09/14/2014 06:25 PM, Nico Bouthoorn wrote:
>
> I've had the same when i left the power pin disconnected (ds18b20), now i
> connect it to ground.
>
> Nico
>
> Martin Patzak (GMX) wrote:
>
> I would check, if the raw data, read from the owfs show that effect or if it
> gets introduced later.
> In any case it looks like a software bug to me - I could be wrong, but I
> don't think so ;o)
>
> Think about what changes you made since your last running system without the
> effect.
>
> Martin
>
> On 09/13/2014 02:34 PM, Håkan Elmqvist wrote:
>
> The installation is on a remote island and I can't physically access it for
> now. The server since about two months is a Raspberry Pi B+ connected to a
> wired network. For reliability reasons I have two DS9490s connected with a
> USB-hub powered by a 2 A supply. The Pi uses a separate 1 A supply. I use
> 0,5 mm2 twisted pair telephone wires and soldered connections. The most
> important sensor, green trace, is connected with a 1,5 m cable to one of the
> adapters. The other two are connected to the other adapter with 3 and 10 m
> cables. The sensors use parasitic power.
> H
> Roberto Spadim skrev 2014-09-13 13:54:
>
> Whats cable distance? Does it use parasite power?
>
>
>
>
> --
> Want excitement?
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Re: [Owfs-developers] unruly temperatures

2014-09-14 Thread Martin Patzak (GMX)

Well, I guess then it is NOT a software bug then... ;o)
It for sure looked like one...

Would be interesting to understand why it results in this weird behaviour!

Cheers,

Martin


On 09/14/2014 06:25 PM, Nico Bouthoorn wrote:
I've had the same when i left the power pin disconnected (ds18b20), 
now i connect it to ground.


Nico

Martin Patzak (GMX) wrote:
I would check, if the raw data, read from the owfs show that effect 
or if it gets introduced later.
In any case it looks like a software bug to me - I could be wrong, 
but I don't think so ;o)


Think about what changes you made since your last running system 
without the effect.


Martin

On 09/13/2014 02:34 PM, Håkan Elmqvist wrote:
The installation is on a remote island and I can't physically access 
it for now. The server since about two months is a Raspberry Pi B+ 
connected to a wired network. For reliability reasons I have two 
DS9490s connected with a USB-hub powered by a 2 A supply. The Pi 
uses a separate 1 A supply. I use 0,5 mm^2 twisted pair telephone 
wires and soldered connections. The most important sensor, green 
trace, is connected with a 1,5 m cable to one of the adapters. The 
other two are connected to the other adapter with 3 and 10 m cables. 
The sensors use parasitic power.

H
Roberto Spadim skrev 2014-09-13 13:54:

Whats cable distance? Does it use parasite power?




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Re: [Owfs-developers] unruly temperatures

2014-09-14 Thread Nico Bouthoorn
I've had the same when i left the power pin disconnected (ds18b20), now 
i connect it to ground.


Nico

Martin Patzak (GMX) wrote:
I would check, if the raw data, read from the owfs show that effect or 
if it gets introduced later.
In any case it looks like a software bug to me - I could be wrong, but 
I don't think so ;o)


Think about what changes you made since your last running system 
without the effect.


Martin

On 09/13/2014 02:34 PM, Håkan Elmqvist wrote:
The installation is on a remote island and I can't physically access 
it for now. The server since about two months is a Raspberry Pi B+ 
connected to a wired network. For reliability reasons I have two 
DS9490s connected with a USB-hub powered by a 2 A supply. The Pi uses 
a separate 1 A supply. I use 0,5 mm^2 twisted pair telephone wires 
and soldered connections. The most important sensor, green trace, is 
connected with a 1,5 m cable to one of the adapters. The other two 
are connected to the other adapter with 3 and 10 m cables. The 
sensors use parasitic power.

H
Roberto Spadim skrev 2014-09-13 13:54:

Whats cable distance? Does it use parasite power?




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