I can't get the Virtual lux script work

[Ptje]

I did try it several times last year, but I can't get it work. I want it to use for my sunscreen, but I do it wrong I think. It makes calls to weather underground as far I can see. I get the following error every 5 minutes.

/home/pi/domoticz/scripts/lua/script_time_SolarSensor.lua:69: attempt to index field 'current_observation' (a nil value)

I don,t see what I do wrong, can somebody help ? This script I have running:




--[[ Virtual Lux sensor and other real-time solar data

~/domoticz/scripts/lua/script_time_SolarSensor.lua

-- Autors ----------------------------------------------------------------
V1.0 - Sébastien Joly - Great original work
V1.1 - Neutrino - Adaptation to Domoticz
V1.2 - Jmleglise - An acceptable approximation of the lux below 1° altitude for Dawn and dusk + translation + several changes to be more userfriendly.
V1.3 - Jmleglise - No update of the Lux data when <=0 to get the sunset and sunrise with lastUpdate
V1.4 - use the API instead of updateDevice to update the data of the virtual sensor to be able of using devicechanged['Lux'] in our scripts. (Due to a bug in Domoticz that doesn't catch the devicechanged event of the virtual sensor)
]]--

-- Variables to customize ------------------------------------------------
local localhost = '127.0.0.1:8080' -- Set your port. (Not the universal IP).
local city = "ISCHAIJK2" -- Your city for Wunderground API
local countryCode = "NL" -- Your country code for Wunderground API
local idxLux ='72' -- Your virtual Lux Device ID
local idxSolarAzimuth ='882' -- Your virtual Azimuth Device ID
local idxSolarAltitude ='883' -- Your virtual Solar Altitude Device ID
local idxUserVarOcta='1' -- Your user variable ID , named octa
local wuAPIkey = "xxxxxxxxxxxxxxxx" -- Your Weather Underground API Key
local latitude = 51.748485 -- your home
local longitude = 5.629728 -- your home
local altitude = 27 -- Your home altitude : run once in debug = 1 to found your altitude in Log and write it here
local WMOID = '06356' -- Your nearest SYNOP Station for ogimet. Very important !
local DEBUG = 1 -- 0 , 1 for domoticz log , 2 for file log

-- Below , edit at your own risk ------------------------------------------

function leapYear(year)
return year%4==0 and (year%100~=0 or year%400==0)
end

function split(s, delimiter)
result = {};
for match in (s..delimiter):gmatch("(.-)"..delimiter) do
table.insert(result, match);
end
return result;
end

function round(num, dec)
if num == 0 then
return 0
else
local mult = 10^(dec or 0)
return math.floor(num * mult + 0.5) / mult
end
end

commandArray = {}

time = os.date("*t")
if ((time.min % 5)==0) then -- Run every 5 minutes. Check the wundergroud API limitation before changing this

json = (loadfile "/home/pi/domoticz/scripts/lua/JSON.lua")() -- For Linux
--json = (loadfile "D:\\Domoticz\\scripts\\lua\\json.lua")() -- For Windows

local arbitraryTwilightLux=6.32 -- W/m² egal 800 Lux (the theoritical value is 4.74 but I have more accurate result with 6.32...)
local constantSolarRadiation = 1361 -- Solar Constant W/m²

if (uservariables['octa'] == nil) then print("Error : Did you create the Uservariable octa ?") end
-- API Wunderground
local config=assert(io.popen('curl http://api.wunderground.com/api/'..wuAP ... ty..'.json'))
local location = config:read('*all')
config:close()
local jsonLocation = json:decode(location)
if( DEBUG == 1) then
local latitude = jsonLocation.current_observation.display_location.latitude
local longitude = jsonLocation.current_observation.display_location.longitude
local altitude = jsonLocation.current_observation.display_location.elevation
print('Lat: '..latitude..'Long: '..longitude..'Alt: '..altitude)
end
relativePressure = jsonLocation.current_observation.pressure_mb -- if you have an another way to get the Pressure, (local barometer ...) then you may optimize the script and avoid the call to api.wunderground)
----------------------------------
local year = os.date("%Y")
local numOfDay = os.date("%j")
if leapYear(year) == true then
nbDaysInYear = 366 -- How many days in the year ?
else
nbDaysInYear = 365
end

angularSpeed = 360/365.25
local Declinaison = math.deg(math.asin(0.3978 * math.sin(math.rad(angularSpeed) *(numOfDay - (81 - 2 * math.sin((math.rad(angularSpeed) * (numOfDay - 2))))))))
timeDecimal = (os.date("!%H") + os.date("!%M") / 60) -- Coordinated Universal Time (UTC)
solarHour = timeDecimal + (4 * longitude / 60 ) -- The solar Hour
hourlyAngle = 15 * ( 12 - solarHour ) -- hourly Angle of the sun
sunAltitude = math.deg(math.asin(math.sin(math.rad(latitude))* math.sin(math.rad(Declinaison)) + math.cos(math.rad(latitude)) * math.cos(math.rad(Declinaison)) * math.cos(math.rad(hourlyAngle))))-- the height of the sun in degree, compared with the horizon

local azimuth = math.acos((math.sin(math.rad(Declinaison)) - math.sin(math.rad(latitude)) * math.sin(math.rad(sunAltitude))) / (math.cos(math.rad(latitude)) * math.cos(math.rad(sunAltitude) ))) * 180 / math.pi -- deviation of the sun from the North, in degree
local sinAzimuth = (math.cos(math.rad(Declinaison)) * math.sin(math.rad(hourlyAngle))) / math.cos(math.rad(sunAltitude))
if(sinAzimuth<0) then azimuth=360-azimuth end
sunstrokeDuration = math.deg(2/15 * math.acos(- math.tan(math.rad(latitude)) * math.tan(math.rad(Declinaison)))) -- duration of sunstroke in the day . Not used in this calculation.
RadiationAtm = constantSolarRadiation * (1 +0.034 * math.cos( math.rad( 360 * numOfDay / nbDaysInYear ))) -- Sun radiation (in W/m²) in the entrance of atmosphere.
-- Coefficient of mitigation M
absolutePressure = relativePressure - round((altitude/ 8.3),1) -- hPa
sinusSunAltitude = math.sin(math.rad(sunAltitude))
M0 = math.sqrt(1229 + math.pow(614 * sinusSunAltitude,2)) - 614 * sinusSunAltitude
M = M0 * relativePressure/absolutePressure

if (DEBUG == 1) then
print('<b style="color:Blue"============== SUN LOG ==================</b>')
print(os.date("%Y-%m-%d %H:%M:%S", os.time()))
print(city .. ", latitude:" .. latitude .. ", longitude:" .. longitude)
print("Home altitude = " .. tostring(altitude) .. " m")
print("number Of Day = " .. numOfDay)
if nbDaysInYear==366 then
print(year .." is a leap year !")
else
print(year.." is not a leap year")
end
print("Angular Speed = " .. angularSpeed .. " per day")
print("Declinaison = " .. Declinaison .. "°")
print("Universel Coordinated Time (UTC)".. timeDecimal .." H.dd")
print("Solar Hour ".. solarHour .." H.dd")
print("Altitude of the sun = " .. sunAltitude .. "°")
print("Angular hourly = ".. hourlyAngle .. "°")
print("Azimuth of the sun = " .. azimuth .. "°")
print("Duration of the sunstroke of the day = " .. round(sunstrokeDuration,2) .." H.dd") -- not used
print("Radiation max in atmosphere = " .. round(RadiationAtm,2) .. " W/m²")
print("Local relative pressure = " .. relativePressure .. " hPa")
print("Absolute pressure in atmosphere = " .. absolutePressure .. " hPa")
print("Coefficient of mitigation M = " .. M .." M0:"..M0)
end

-- Get SYNOP message from Ogimet web site
hourUTCminus1 = os.date("!%H")-1
if string.len(hourUTCminus1) == 1 then
hourUTCminus1 = "0" .. hourUTCminus1
end
UTC = os.date("%Y%m%d").. hourUTCminus1.."00" -- os.date("!%M")
if (DEBUG == 1) then
local WMOID = jsonLocation.current_observation.display_location.wmo
end

cmd='curl "http://www.ogimet.com/cgi-bin/getsynop? ... gin='..UTC..'"'
if( DEBUG == 1) then print(cmd) end
local ogimet=assert(io.popen(cmd))
local synop = ogimet:read('*all')
ogimet:close()
if( DEBUG == 1) then print('ogimet:'..synop) end

if string.find(synop,"Status: 500") == nil
then
rslt = split(synop,",")
CodeStation = rslt[1]
rslt = split(synop, " "..CodeStation.. " ")
Trame = string.gsub(rslt[2], "=", "")
Trame = CodeStation .." ".. Trame
rslt = split(Trame, " ")
Octa = string.sub(rslt[3], 1, 1) -- 3rd char is the cloud layer. 0=no cloud , 1-8= cloudy from 1 to 8 max , 9 =Fog , / = no data
if Octa == "/" then -- not defined ? take the previous value
Octa = uservariables['octa']
elseif Octa == "9" then
Octa = 8
end
else
Octa = uservariables['octa']
end

--os.execute('curl "http://127.0.0.1:8081/json.htm?type=com ... ring(Octa)..'"')
commandArray[#commandArray + 1] = {['Variable:octa'] = tostring(Octa)}

Kc=1-0.75*math.pow(Octa/8,3.4) -- Factor of mitigation for the cloud layer

if sunAltitude > 1 then -- Below 1° of Altitude , the formulae reach their limit of precision.
directRadiation = RadiationAtm * math.pow(0.6,M) * sinusSunAltitude
scatteredRadiation = RadiationAtm * (0.271 - 0.294 * math.pow(0.6,M)) * sinusSunAltitude
totalRadiation = scatteredRadiation + directRadiation
Lux = totalRadiation / 0.0079 -- Radiation in Lux. 1 Lux = 0,0079 W/m²
weightedLux = Lux * Kc -- radiation of the Sun with the cloud layer
elseif sunAltitude <= 1 and sunAltitude >= -7 then -- apply theoretical Lux of twilight
directRadiation = 0
scatteredRadiation = 0
arbitraryTwilightLux=arbitraryTwilightLux-(1-sunAltitude)/8*arbitraryTwilightLux
totalRadiation = scatteredRadiation + directRadiation + arbitraryTwilightLux
Lux = totalRadiation / 0.0079 -- Radiation in Lux. 1 Lux = 0,0079 W/m²
weightedLux = Lux * Kc -- radiation of the Sun with the cloud layer
elseif sunAltitude < -7 then -- no management of nautical and astronomical twilight...
directRadiation = 0
scatteredRadiation = 0
totalRadiation = 0
Lux = 0
weightedLux = 0 -- should be around 3,2 Lux for the nautic twilight. Nevertheless.
end

if (DEBUG == 1) then
print("Station SYNOP = " .. WMOID)
print( Octa .. " Octa")
print("Kc = " .. Kc)
print("Direct Radiation = ".. round(directRadiation,2) .." W/m²")
print("Scattered Radiation = ".. round(scatteredRadiation,2) .." W/m²")
print("Total radiation = " .. round(totalRadiation,2) .." W/m²")
print("Total Radiation in lux = ".. round(Lux,2).." Lux")
print("and at last, Total weighted lux = ".. round(weightedLux,2).." Lux")
end

if tonumber(otherdevices_svalues['Lux'])+round(weightedLux,0)>0 -- No update if Lux is already 0. So lastUpdate of the Lux sensor will keep the time when Lux has reached 0. (Kind of timeofday['SunsetInMinutes'])
then
-- commandArray[#commandArray + 1] = {['UpdateDevice'] = idxLux..'|0|'..tostring(round(weightedLux,0))} -- THis form is not recommended. due to limitation of the eventsystem of Domoticz
commandArray[#commandArray + 1]={['OpenURL']="http://"..localhost.."/json.htm?type=command&param=udevice&idx="..idxLux.."&nvalue=0&svalue="..tostring(round(weightedLux,0)) }
end
-- commandArray[#commandArray + 1] = {['UpdateDevice'] = idxSolarAzimuth..'|0|'..tostring(round(azimuth,0))}
commandArray[#commandArray + 1]={['OpenURL']="http://"..localhost.."/json.htm?type=command&param=udevice&idx="..idxSolarAzimuth.."&nvalue=0&svalue="..tostring(round(azimuth,0)) }
-- commandArray[#commandArray + 1] = {['UpdateDevice'] = idxSolarAltitude..'|0|'..tostring(round(sunAltitude,0))}
commandArray[#commandArray + 1]={['OpenURL']="http://"..localhost.."/json.htm?type=command&param=udevice&idx="..idxSolarAltitude.."&nvalue=0&svalue="..tostring(round(sunAltitude,0)) }

if (DEBUG == 2) then
logDebug=os.date("%Y-%m-%d %H:%M:%S",os.time())
logDebug=logDebug.." Azimuth:" .. azimuth .. " Height:" .. sunAltitude
logDebug=logDebug.." Octa:" .. Octa.." KC:".. Kc
logDebug=logDebug.." Direct:"..directRadiation.." inDirect:"..scatteredRadiation.." TotalRadiation:"..totalRadiation.." LuxCloud:".. round(weightedLux,2)
os.execute('echo '..logDebug..' >>logSun.txt') -- compatible Linux & Windows
end
end
return commandArray

I only don't know if the value for altitude is wright. I don't see any value in the log.

[Ptje]

Hello,

This rule I think is '69'

local latitude = jsonLocation.current_observation.display_location.latitude

I don't have to edit that rule I think, but it gets the infomation from rule '22' I think. I don't see the problem in my edited value.

Anyone a good tip ?

Greetings,
Peter

[Ptje]

Nobody has this script working ?

Greetings,
Peter