Bad temperature readings with DS18B20

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machal88
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Bad temperature readings with DS18B20

Post by machal88 » Saturday 10 October 2015 22:09

I have a problem with reading temperatures if outside is below 0 degrees in Celcius via DS18B20.

If the temperature outside is under "0" everything is OK, in Domoticz values are OK also, but now at night on the normal thermometer is -2 degrees, but on Domoticz is "0" and gives in LOG Error: 1-Wire system : error reading value from /sys/bus/w1/devices/

If I check the status via command in SSH " /sys/bus/w1/devices/28-0115623756ff $ cat w1_slave" it shows correct values (ie. -1222), so I think there is a problem in Domoticz...

Could you please give me some advise on this case? I will be very grateful ;)

EDIT: after update to newest beta version of Domoticz it's working OK, but next problem occurs - this time with scripts - switches over gpio/433mhz... they doesn't work...

EDIT #2: working after adding "///" (3 slashes) before script :D

Jastrzi
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Re: Bad temperature readings with DS18B20

Post by Jastrzi » Sunday 11 October 2015 8:50

machal88 have a same problem. Just noticed the readings below 0 degrees starts failing and Domoticz does not show values below 0.

Domoticz Team, are you planing to release the stable version soon or I need upgrade to BETA?

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gizmocuz
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Re: Bad temperature readings with DS18B20

Post by gizmocuz » Sunday 11 October 2015 13:28

a stable will be published when it is ready (and not now... waiting for some changes first)

To answer your question, update to the stable indeed!
Quality outlives Quantity!

makuta77
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Re: Bad temperature readings with DS18B20

Post by makuta77 » Monday 12 October 2015 10:49

Hi,
I have exactly the same error in version 2.2563.
Need a workaround for this problem please...

Best Regards

machal88
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Re: Bad temperature readings with DS18B20

Post by machal88 » Monday 12 October 2015 20:43

Hi @makuta77

You just need to update your Domoticz to the latest beta (i.e. V2.3295), this will solve the problem :)

To update Domoticz from your version or below type via SSH or at the terminal on Raspbian:

Code: Select all

1. cd domoticz
2. wget http://domoticz.sourceforge.net/beta/domoticz_linux_armv7l.tgz
3. tar xvfz domoticz_linux_armv7l.tgz
4. rm domoticz_linux_armv7l.tgz
5. sudo service domoticz.sh restart
Please let us know if this solution will work for you :)

popunonkok
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Re: Bad temperature readings with DS18B20

Post by popunonkok » Wednesday 14 October 2015 13:55

I have the same problem aswell...
In Domoticz it flatlines at Zero degrees. But if i look at my RDDtools graph it shows below zero.
Its feels especially bad because where I live the temperature is just starting to drop below zero in the nights witch is kind of interesting to Log.

@machal88 : The problem with your solution is that i guess it could bring along other kind of problem since it is the Beta version. Im not interested in the Beta because I want my system to be as stable as possible.

Really looking forward to the next stable version.

makuta77
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Re: Bad temperature readings with DS18B20

Post by makuta77 » Wednesday 14 October 2015 15:23

Hi,
I agree with @popunonkok that install beta version is not a solution. I thing we need a patch or something for stable version to display temperature correctly.

For that moment i don't want to install beta version.

eriksson25
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Re: Bad temperature readings with DS18B20

Post by eriksson25 » Friday 20 November 2015 16:34

Hi, just wanted to say that I had the same problem, did the upgrade to beta version and it works now. Its my small system so its ok if its not 100% stable.

makuta77
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Re: Bad temperature readings with DS18B20

Post by makuta77 » Wednesday 25 November 2015 8:54

Hello,
In my system upgrade to beta version resolved the problem and it is quite stable :)

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