weather forecast query and set variable

[Guest Kuuno]

How is it possible over LUA to query for a specific value from web. lets say temperature and then set variable value according to that.

the idea would be to query tomorrows weather forecast and then control heating accordingly.

if temp forecast outside = more than 10 degrees higher than now then stop heating the house

this would help to prevent overheating when there are big temperature drops or rises

sample link to get the info:

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thanks!

[Guest PJ]

Something like this was posted recently on polish forum by sztywniak.

You have to create virtual device with button like this. It has polish comments, but you should be able to find out what you have to do without them:

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It gets information about temperature from this website -

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and write it to global variable "Temp_zew"

You need to use debugger in firefox to find out where are numbers related with temperature you want. Traxelektronik is very simple in construction, so it isn't a problem. Would be more difficult with your sample link.

[Guest Kuuno]

can someone help to extract today and tomorrow temp forecast from this link

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thanks!

[ Added: 2013-07-15, 12:50 ]

found little bettary way

here is a sample, i should extract celsius from period 1

"epoch":"1373911200",

"pretty":"9:00 PM EEST on July 15, 2013",

"day":15,

"month":7,

"year":2013,

"yday":195,

"hour":21,

"min":"00",

"sec":0,

"isdst":"1",

"monthname":"July",

"weekday_short":"Mon",

"weekday":"Monday",

"ampm":"PM",

"tz_short":"EEST",

"tz_long":"Europe/Tallinn"

},

"period":1,

"high": {

"fahrenheit":"72",

"celsius":"22"

[Shad 4]

You must have an API on this site web.

So with a small script in php you can extract all and put it in global variable.

[jompa68 121]

Here is an example:

you need to create an free account to fetch this data from wunderground

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Create a virtual device

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[Shad 4]

Good, didn't know how to parse json with HC2

[Guest Kuuno]

thanks!

i already had the key and could get some data but used http response

your way is much better!

thanks

[jompa68 121]

can someone help out with this json? want to get the forecast part...

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i can do to date part but not any longer then that, becase next part do not have any name (i think)

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[ Added: 2013-07-15, 17:13 ]

From json parser i see this:

and i test this:

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But log do not show anything. What am i doing wrong?

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[HorseOne 1]

forecastday is an array. You should try the statement below

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[jompa68 121]

That did not work....still nothing in log

[ Added: 2013-07-15, 18:46 ]

OH! found the problem..json error?

first in array is 1 not 0...strange, can someone explain that?

[ Added: 2013-07-15, 19:04 ]

Final solution

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[william.abbo 1]

Here is an example:

you need to create an free account to fetch this data from wunderground

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Create a virtual device

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Jompa,

I copied your LUA-code in a virtual device and filled in my own API-key. When I run the scene I get a error: [ERROR] 20:20:22: line 8: attempt to index global 'Net' (a nil value)

It is pointing to this line: FHEM = Net.FHttp("api.wunderground.com")

What am I doing wrong or forgetting ??

Never mind, forget it. I did not read everything, it's working right now.

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[Sagittarius 3]

Just wanna say thank you, this post really help me figure out json for my HC

 

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[LordOfFalcons 5]

i wanted to implement this, but noticed that weather underground no longer provides a free API service. has anyone found a suitable replacement?