Rain prediction - weather underground

[kingofsnake74]

Hello all,

Tried to use this script but is not functioning. Before debugging i would like to know if this script can be used in Domoticz stable 3.8153. If so can someone post the complete script. Thanx all. Greetings Jerry

[elmortero]

Should work.
Please post the error you get, and your script.

[arek156]

Hello
Very interesting project, but don't work with my domoticz. I put in a log and script, what could be a problem?

2018-05-25 08:40:01.448 Error: dzVents: Error: An error occured when calling event handler weather_rain
2018-05-25 08:40:01.448 Error: dzVents: Error: ...oticz/scripts/dzVents/generated_scripts/weather_rain.lua:23: attempt to index field 'hourly_forecast' (a nil value)

Spoiler: show

return {
active = true,
on = {
timer = {'every 2 minuteS'}
},

execute = function(domoticz)
-- Variables to customize ------------------------------------------------
local city = "Poznan" -- Your city for Wunderground API
local countryCode = "pl" -- Your country code for Wunderground API
local wuAPIkey = "xxxxxxxxxxxxx" -- Your Weather Underground API Key
local rainswitch1 = domoticz.devices('Rain-1-hour') -- The switch for rain in the next hour
local rainswitch24 = domoticz.devices('Rain-today') -- the switch for rain Today
local popDay = domoticz.devices('popday') -- The percentage virtual sensor
------------------------------------------------------------------------------------ pop24
--begin of the part to get hourly rain chances
json = (loadfile "/home/pi/domoticz/scripts/lua/JSON.lua")()
local linker1 = tostring('curl http://api.wunderground.com/api/' .. wuAPIkey .. '/hourly/q/' .. countryCode .. '/' .. city .. '.json')
local config=assert(io.popen(linker1))
local loc = config:read('*all')
config:close()
local jsonLocation = json:decode(loc)
local pop1 = tonumber(jsonLocation.hourly_forecast[1].pop)
popDay.updatePercentage(pop1)

if pop1 >= 30 and rainswitch1.state ~= 'On' --switch will be turned on if probability is higher than 30%
then rainswitch1.switchOn()
end

if pop1 < 30 and rainswitch1.state ~= 'Off' --if the probability is lower than 30% switch will be turned off
then
rainswitch1.switchOff()
end
--end of the part to get hourly rain chances
--begin of the part to get daily rain chances
local linker2 = tostring('curl http://api.wunderground.com/api/' .. wuAPIkey .. '/forecast/q/' .. countryCode .. '/' .. city .. '.json')
json = (loadfile "/home/pi/domoticz/scripts/lua/JSON.lua")()
local config=assert(io.popen(linker2))
local loc = config:read('*all')
config:close()
local jsonLocation = json:decode(loc)
local pop24 = tonumber(jsonLocation.forecast.txt_forecast.forecastday[1].pop)
if pop24 >= 30 and rainswitch24.state ~= 'On'
then rainswitch24.switchOn()
end
if pop24 < 30 and rainswitch24.state ~= 'Off'
then rainswitch24.switchOff()
end
end
}

[elmortero]

Hi arek156

If you use the countrycode + citycode there are 2 results. WUnderground shows the 2 posible locations and no weather results.
Because of that the data you try to get is non-existing(nil)

With these changes it should be ok:
Replace ' .. countryCode .. '/' .. city .. '.json'
with
zmw:00000.168.12490.json' so that the it will result in :

'curl http://api.wunderground.com/api/' .. wuAPIkey .. '/forecast/q/zmw:00000.168.12490.json'

On the other hand, dzvents has given us better ways since the original post (thank you Dannybloe!!)

I include an adapted version of your script in order to use asynchonous http requests --> so domoticz does not get blocked/lagged if there is an issue with getting the data.
For this your dzvents version must be higher than 2.3

Code: Select all

return {
	on = {
		timer = { 'every 15 minutes'},
		httpResponses = { 'wUnderG' } -- matches callback string below
	},

execute = function(domoticz, triggerItem)
-- Variables to customize ------------------------------------------------
local wuAPIkey = "xxxxxx" -- Your Weather Underground API Key
local rainswitch1 = domoticz.devices('Rain-1-hour')	-- The switch for rain in the next hour
local rainswitch24 = domoticz.devices('Rain-today')	-- the switch for rain Today
local popDay = domoticz.devices('popday')	-- The percentage virtual sensor
------------------------------------------------------------------------------------ pop24

local wUrl = 'http://api.wunderground.com/api/' .. wuAPIkey .. '/forecast/hourly/q/zmw:00000.168.12490.json'

		if (triggerItem.isTimer) then
			domoticz.openURL({
				url = wUrl,
				method = 'GET',
				callback = 'wUnderG'
			})
			
		elseif (triggerItem.isHTTPResponse) then
		local response = triggerItem
			if (response.ok and response.isJSON) then
					--hear goes the check for the next hour
					local pop1 = tonumber(response.json.hourly_forecast[1].pop)
					popDay.updatePercentage(pop1)
						if pop1 >= 30 then --switch will be turned on if probability is higher than 30%
						 rainswitch1.switchOn().checkFirst()
						else
						rainswitch1.switchOff().checkFirst()
						end
					--hear goes the check for today
					local pop24 = tonumber(response.json.forecast.txt_forecast.forecastday[1].pop)
						if pop24 >= 30 then
						 rainswitch24.switchOn().checkFirst()
						else
						 rainswitch24.switchOff().checkFirst()
						end	
					end
				else
					print('**wUnderG failed to fetch info')
			end				
		end	
}

[devros]

Hi arek156

If you use the countrycode + citycode there are 2 results. WUnderground shows the 2 posible locations and no weather results.
Because of that the data you try to get is non-existing(nil)

With these changes it should be ok:
Replace ' .. countryCode .. '/' .. city .. '.json'
with
zmw:00000.168.12490.json' so that the it will result in :

'curl http://api.wunderground.com/api/' .. wuAPIkey .. '/forecast/q/zmw:00000.168.12490.json'

On the other hand, dzvents has given us better ways since the original post (thank you Dannybloe!!)

I include an adapted version of your script in order to use asynchonous http requests --> so domoticz does not get blocked/lagged if there is an issue with getting the data.
For this your dzvents version must be higher than 2.3

thanks, but how to find b]zmw:00000.168.12490.json'[/b] for my location...

[elmortero]

If you enter the URL you had in a browser you will get a JSON response.
In that there will be all the stations for PL/Poznan each with their zmw
The one I used in above script is the first one of the results

[arek156]

Hello
I'm using dzVents 2.2.0 and unfortunately adding a line of code does not help, I'm throwing in again the error that appeared in the log and the entire script. I will be grateful for your help

2018-05-30 17:47:03.139 Error: dzVents: Error: An error occured when calling event handler weather_rain
2018-05-30 17:47:03.139 Error: dzVents: Error: ...oticz/scripts/dzVents/generated_scripts/weather_rain.lua:25: attempt to index field 'hourly_forecast' (a nil value)

Spoiler: show

-- required:
-- 2 virtual switches: one for next hour prediction and one for Today prediction
-- 1 virtual sensor Percentage: for Probability Of precipitation
-- a weatherunderground API key. Instructions to get one are on the Domoticz Wiki
return {
active = true,
on = {
timer = {'every 1 minutes'}
},

execute = function(domoticz)
-- Variables to customize ------------------------------------------------
local wuAPIkey = "000000" -- Your Weather Underground API Key
local rainswitch1 = domoticz.devices('Rain-1-hour') -- The switch for rain in the next hour
local rainswitch24 = domoticz.devices('Rain-today') -- the switch for rain Today
local popDay = domoticz.devices('popday') -- The percentage virtual sensor
------------------------------------------------------------------------------------ pop24
--begin of the part to get hourly rain chances
json = (loadfile "/home/pi/domoticz/scripts/lua/JSON.lua")()
local linker1 = tostring('curl http://api.wunderground.com/api/' .. wuAPIkey .. '/forecast/q/zmw:00000.168.12490.json')
local config=assert(io.popen(linker1))
local loc = config:read('*all')
config:close()
local jsonLocation = json:decode(loc)
local pop1 = tonumber(jsonLocation.hourly_forecast[1].pop)
popDay.updatePercentage(pop1)

if pop1 >= 30 and rainswitch1.state ~= 'On' --switch will be turned on if probability is higher than 30%
then rainswitch1.switchOn()
end

if pop1 < 30 and rainswitch1.state ~= 'Off' --if the probability is lower than 30% switch will be turned off
then
rainswitch1.switchOff()
end
--end of the part to get hourly rain chances
--begin of the part to get daily rain chances
local linker2 = tostring('curl http://api.wunderground.com/api/' .. wuAPIkey .. '/forecast/q/' .. countryCode .. '/' .. city .. '.json')
json = (loadfile "/home/pi/domoticz/scripts/lua/JSON.lua")()
local config=assert(io.popen(linker2))
local loc = config:read('*all')
config:close()
local jsonLocation = json:decode(loc)
local pop24 = tonumber(jsonLocation.forecast.txt_forecast.forecastday[1].pop)
if pop24 >= 30 and rainswitch24.state ~= 'On'
then rainswitch24.switchOn()
end
if pop24 < 30 and rainswitch24.state ~= 'Off'
then rainswitch24.switchOff()
end
end
}

[elmortero]

It is not working because in your URL you only get forecast but try to read hourly_forecast.
This works (tested it here). Also I joined the 2 URLs into one. (forecast and hourly)

Code: Select all

return {
active = true, 
on = {
timer = {'every 15 minutes'}
},

execute = function(domoticz)
-- Variables to customize ------------------------------------------------
local wuAPIkey = "xxxxxxxxx" -- Your Weather Underground API Key
local rainswitch1 = domoticz.devices('Rain-1-hour')	-- The switch for rain in the next hour
local rainswitch24 = domoticz.devices('Rain-today')	-- the switch for rain Today
local popDay = domoticz.devices('popday')	-- The percentage virtual sensor
------------------------------------------------------------------------------------ pop24
--begin of the part to get hourly rain chances
json = (loadfile "/home/pi/domoticz/scripts/lua/JSON.lua")()
local linker1 = tostring('curl http://api.wunderground.com/api/' .. wuAPIkey .. '/forecast/hourly/q/zmw:00000.168.12490.json')
	local config=assert(io.popen(linker1))
			local loc = config:read('*all')
			config:close()
			local jsonLocation = json:decode(loc)
local pop1 = tonumber(jsonLocation.hourly_forecast[1].pop)
popDay.updatePercentage(pop1)

	if pop1 >= 30 and rainswitch1.state ~= 'On' --switch will be turned on if probability is higher than 30%
	then rainswitch1.switchOn()
	end

	if pop1 < 30 and rainswitch1.state ~= 'Off'	--if the probability is lower than 30% switch will be turned off
	then rainswitch1.switchOff()
	end

   local pop24 = tonumber(jsonLocation.forecast.txt_forecast.forecastday[1].pop)
	if pop24 >= 30 and rainswitch24.state ~= 'On' 
	then rainswitch24.switchOn()
	end
	if pop24 < 30 and rainswitch24.state ~= 'Off'
	then rainswitch24.switchOff()
	end	
end
}

[arek156]

Everything works, thanks to the elmortero.

Wysłane z Huawei P9

[EdwinK]

The attachment Screen Shot 2018-07-26 at 17.37.14.png is no longer available

Getting this error in the events-box

Screen Shot 2018-07-26 at 17.37.14.png (51.64 KiB) Viewed 2330 times

[elmortero]

EdwinK, maybe also post the log where it tells more about the error.
Or tell what the balloon says when you move the mouse over the red cross.

[EdwinK]

O.. I thought I had done that.

The error is: expected ']' near 'local'

(it's in the severe weather part of the script).

Because of the error I removed that part for now.

[rbisschops]

Hi all, you can not get a new api key anymore for WU. Also the API description seems not visible anymore.Anyone has a link to the API description that works? Or maybee an ofline copy?

[elmortero]

https://www.wunderground.com/weather/api/d/docs

[rbisschops]

@elmortero: thanks, that helps. Script is working like a charm, it can use minor updates for version 2.4.X of dzVents . Will test and submit my latest version here as well.

[EdwinK]

Now that the access to the Weather Underground API is almost over, does anyone know of a replacement for this?

[EdwinK]

Too bad... I really need that rain-percentage for the sunscreen script (now it's time to check for those. It's starting to snow)

[Steef]

I am using a script that is using the data from Darksky, maybe that is an option for you? You can make up to 1000 requests per day for free.

[EdwinK]

Maybe if you are willing to share that script

[papoo]

perhaps? https://easydomoticz.com/forum/viewtopi ... it=darksky