T011235
commented
2 weeks ago Hi, I now have looked at your code and found out why I only got zeros. You only implemented the heat index calculation for temperatures above 80F.
So I added some calculations to your function.
- I took your calculation function and added the rest of the calculation from the linked website.
- I tested a few value pares with the help of a online calculator
My GO skills aren't the best. So please look at my code and if you think my code is Ok please add it to your Repo so we all can use it for our weather stations.
func calculateHeatIndex(temperature, humidity float64) float64 {
// define vars
var heatIndex float64
var adjustment float64
// convert temperature to Fahrenheit
temperature = (temperature * 1.8) + 32
// https://www.wpc.ncep.noaa.gov/html/heatindex_equation.shtml
// calculate Steadmans result
heatIndex = 0.5 * (temperature + 61.0 + ((temperature - 68.0) * 1.2) + (humidity * 0.094))
// use Rothfusz regression if Steadmans result yields an heatIndex greate 80F
if heatIndex >= 80.0 {
// calculate the heat index using the Rothfusz regression
heatIndex = -42.379 + 2.04901523*temperature + 10.14333127*humidity - 0.22475541*temperature*humidity - 6.83783e-3*math.Pow(temperature, 2) - 5.481717e-2*math.Pow(humidity, 2) + 1.22874e-3*math.Pow(temperature, 2)*humidity + 8.5282e-4*temperature*math.Pow(humidity, 2) - 1.99e-6*math.Pow(temperature, 2)*math.Pow(humidity, 2)
// calculate any necessary adjustment
adjustment = 0
if humidity < 13 && temperature >= 80 && temperature <= 112 {
adjustment = -1.0 * ((13.0 - humidity) / 4.0) * math.Sqrt((17.0-math.Abs(temperature-95.0))/17.0)
}
if humidity > 85 && temperature >= 80 && temperature <= 87 {
adjustment = ((humidity - 85.0) / 10.0) * ((87.0 - temperature) / 5.0)
}
// add adjustment to heatIndex
heatIndex = heatIndex + adjustment
}
// convert heat index back to Celsius and return
heatIndex = (heatIndex - 32) * (5.0 / 9.0)
return heatIndex
}With best regards, T011235
peterzen
The Heat Index Value mostly shows only 0. I'm using a Renkforce (Froggit) WH2600. Outdoor Temperature and Outdoor Humidity both greater than 0. For example see Picture.