Scraping only the temperature from WeatherUnderground sensor

[ThinkPad]

I would like to use the outside temperature i get from wunderground in an event. However, the data from Wunderground is all put in one single device. See screenshot below.

Above are virtual devices i got when i added the wunderground hardware.
I tried 3 different stations in my neighborhood, but they all put the data in one device like this.

How can i get outside temperature in one device?

[jackslayter]

add the first line to device
create new virtual temperature sensor
create new lua script

Code: Select all

--script_device_tempWU.lua
local sensorwu = 'sensor' --sensor of wunderground
local tempsensor = 'temp' --virtual temp sensor of wunderground
local idx = 68 --idx of your virtual temp sensor of wunderground
commandArray = {}
if (otherdevices_lastupdate[sensorwu]) then
sWeatherTemp, sWeatherHumidity, sWeatherPressure = otherdevices_svalues[sensorwu]:match("([^;]+);([^;]+);([^;]+)")
sWeatherTemp = tonumber(sWeatherTemp)
commandArray['UpdateDevice'] = idx .. '|0|' .. tostring(sWeatherTemp)
end
return commandArray

[ThinkPad]

Hey thanks!

But can you help me a little bit more?

I found out how to create a virtual temp sensor:
/json.htm?type=createvirtualsensor&idx=XX&sensortype=80
(XX is the IDX i have chosen, looked what the current highest IDX was and did that +1) 80 stands for temperature only.

But what to do now? I put the script in /home/pi/domoticz/scripts/lua/. I put in the IDX.
Do i need to change anything else? ('sensorwu' and 'tempsensor' ?)
And what do you mean by: "add the first line to device" ?

[jackslayter]

Hey thanks!

But can you help me a little bit more?

I found out how to create a virtual temp sensor:
/json.htm?type=createvirtualsensor&idx=XX&sensortype=80
(XX is the IDX i have chosen, looked what the current highest IDX was and did that +1) 80 stands for temperature only.

I never used that

But what to do now? I put the script in /home/pi/domoticz/scripts/lua/. I put in the IDX.
Do i need to change anything else? ('sensorwu' and 'tempsensor' ?)
And what do you mean by: "add the first line to device" ?

Yes
No
Add the line: 44 wunderground 0001 ...... in your device list (green arrow)

[ThinkPad]

I am sorry but i don't understand how to get it working. Can you please explain a little bit more?

How do you created a virtual sensor?
And you say: 'add the first line to device'. But i really don't understand that part. Which first line, and to which device, and mostly: HOW? :p

[jackslayter]

the arrow will be blue
if green click on to add device

[ThinkPad]

Together with someone from a Dutch IT forum i figured it out. I also added it to the wiki to help others:

http://www.domoticz.com/wiki/Virtual_we ... emperature

[ThinkPad]

User 'nickyb2' did a few small modifications to the script, so it now runs as soon as the sensor from WU is updated. This instead of the version i had before, where it would run every 10 minutes. In the worst case the script could lag behind so the data in the virtual_temp sensor would be 19 minutes old. It is now instaneously updated as soon as the WU sensor is updated.

http://www.domoticz.com/wiki/Virtual_we ... emperature

[Siewert308SW]

User 'nickyb2' did a few small modifications to the script, so it now runs as soon as the sensor from WU is updated. This instead of the version i had before, where it would run every 10 minutes. In the worst case the script could lag behind so the data in the virtual_temp sensor would be 19 minutes old. It is now instaneously updated as soon as the WU sensor is updated.

http://www.domoticz.com/wiki/Virtual_we ... emperature

It's still not very clear what to put in the "sensorwu"
idx, id, hardware or name?

No matter what i put in my virtual sensor isn't updated.

[Siewert308SW]

Got it working but not by the WiKi.
Something is missing the script or something else is going on.

This is what i've done.
Added WeatherUnderground as my virtual Weatherstation per wiki.
Added the WeatherUnderground device with the ID 0001 under the unused devices list and called it WeatherUnderground
Then i got to Setup --> Hardware, and created new virtual hardware and called it "Buiten Temperatuur". (Outside Temperature)
Then i clicked 'Create virtual sensor' and created a sensor with type 'Temperature'.
Then i got to Setup --> Devices and added the new "Buiten Temperatuur" virtual device to Domo and looked up the Device ID in the devices menu

This is all according the WiKi.

But now the LUA script
When i use the LUA script in the WiKi it doesn't work and the new virtual "Buiten Temperatuur" device isn't updated.
Did some searching and some copy and past en the final script below does work.

Code: Select all

--script_device_tempWU.lua
local sensorwu = 'WeatherUnderground' --Original sensor of wunderground carrying the 0001 ID 
local tempsensor = 'temp' --virtual temp sensor of wunderground (don't touch)
local idx = 157 --idx of your manual created virtual temp sensor
commandArray = {}
if devicechanged[sensorwu] then
sWeatherTemp, sWeatherHumidity, sWeatherPressure = otherdevices_svalues[sensorwu]:match("([^;]+);([^;]+);([^;]+)")
sWeatherTemp = tonumber(sWeatherTemp)
commandArray['UpdateDevice'] = idx .. '|0|' .. tostring(sWeatherTemp)
end

return commandArray

[ThinkPad]

That's weird, as it is working fine here.

script_device_sensorWU.lua

Code: Select all

local sensorwu = 'Buitentemperatuur' --sensor from wunderground
local idx = 102 --idx of your virtual temp sensor of wunderground
commandArray = {}
 
if devicechanged[sensorwu] then
	sWeatherTemp, sWeatherHumidity, sWeatherPressure = otherdevices_svalues[sensorwu]:match("([^;]+);([^;]+);([^;]+)")
	sWeatherTemp = tonumber(sWeatherTemp)
	commandArray['UpdateDevice'] = idx .. '|0|' .. tostring(sWeatherTemp)
end
return commandArray

'Buitentemperatuur' is the device that is added when you configure WU. This is the device that contains multiple values, like temperature, pressure, humidity etc.
IDX 102 is a virtual temperature sensor i created.

I have 'script_device_sensorWU.lua' in /home/pi/domoticz/scripts/lua.

I uploaded the script contents again to the wiki, maybe there was a typo in it.

[D'rMorris]

Also check this wiki page.

[myozone]

This is what I have and it doesn't work ...

Code: Select all

local sensorwu = 'wx' --name of the sensor that gets created when you add the WU device (and that contains multiple values like temperature, humidity, barometer etc)
local idx = 21 --idx of the virtual temperature sensor you created above
commandArray = {}
 
if devicechanged[sensorwu] then
	sWeatherTemp, sWeatherHumidity, sWeatherPressure = otherdevices_svalues[sensorwu]:match("([^;]+);([^;]+);([^;]+)")
	sWeatherTemp = tonumber(sWeatherTemp)
	commandArray['newtemp'] = idx .. '|27|' .. tostring(sWeatherTemp)
end
return commandArray

[ThinkPad]

Change

Code: Select all

local idx = 21 

in the script from 21 to 27 and see if it works.

[myozone]

Thank you for the prompt reply! changed it - still not working...

[ThinkPad]

Hmmm

I don't know, i compared my WU device and virtual sensor device to yours, and look identical.
Maybe try copying my script again:

Code: Select all

local sensorwu = 'Buitentemperatuur' --sensor from wunderground
local idx = 102 --idx of your virtual temp sensor of wunderground
commandArray = {}
 
if devicechanged[sensorwu] then
	sWeatherTemp, sWeatherHumidity, sWeatherPressure = otherdevices_svalues[sensorwu]:match("([^;]+);([^;]+);([^;]+)")
	sWeatherTemp = tonumber(sWeatherTemp)
	commandArray['UpdateDevice'] = idx .. '|0|' .. tostring(sWeatherTemp)
end
return commandArray

Above code is directly pulled from my working setup, so nothing edited/modified.

[myozone]

The only major difference is your line:

Code: Select all

commandArray['UpdateDevice'] = idx .. '|0|' .. tostring(sWeatherTemp)

and mine is

Code: Select all

commandArray['newtemp'] = idx .. '|27|' .. tostring(sWeatherTemp)

[ThinkPad]

Ok, but why?

Just try my script and see if it works. I don't understand where your modification is needed for

[myozone]

One other thing, I have mine running on a Windows 7 machine. The script is executing though - showing in the log.

[myozone]

Got it working now ! - Thanks for your help. change the line

Code: Select all

commandArray['UpdateDevice'] = idx .. '|0|' .. tostring(sWeatherTemp)

I thought the script worked like that !