RealWind.lua

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-- A thermometer measures the actual temperature but it is not the same as the
-- perceived temperature. To get perceived temperature you must also take the
-- wind into account. If TellStick ZNet has an anemometer this can be used to
-- calculate the perceived temperature.
--
-- The script below calculates this and gives the anemometer a thermometer value.
--
-- Source of the algorithm:
-- http://www.smhi.se/kunskapsbanken/meteorologi/vindens-kyleffekt-1.259
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-- EDIT THESE

local windSensor = 287
local tempSensor = 297

-- DO NOT EDIT BELOW THIS LINE

local deviceManager = require "telldus.DeviceManager"
local tempValue = deviceManager:device(tempSensor).sensorValue(1, 0)
local windValue = deviceManager:device(windSensor).sensorValue(64, 0)

function calculate()
  if tempValue == nil or windValue == nil then
    return
  end
  local w = math.pow(windValue, 0.16)
  local v = 13.12 + 0.6215*tempValue - 13.956*w + 0.48669*tempValue*w
  v = math.floor(v * 10 + 0.5) / 10
  local windDevice = deviceManager:device(windSensor)
  windDevice:setSensorValue(1, v, 0)
end

function onSensorValueUpdated(device, valueType, value, scale)
  if device:id() == windSensor and valueType == 64 and scale == 0 then
    windValue = value
    calculate()
  elseif device:id() == tempSensor and valueType == 1 and scale == 0 then
    tempValue = value
    calculate()
  end
end