Dew point calculation (Rules)

[Vilda]

There are two ways how to calculate dew point - simple but inaccurate formula and more complex but quite accurate formula. In the Rules tutorial dew point example (https://www.letscontrolit.com/wiki/inde ... example.29) is only the simple one. Check below for the second and more precise way of dew point calculation via Rules:

Code: Select all

on BME280#Temperature do

    //Simple - less accurate formula (not useful for humidity under 50%)
    TaskValueSet 4,1,[BME280#Teplota]-(100-[BME280#Humidity])/5

    //Complex - accurate formula
    TaskValueSet 5,1,(([BME280#Humidity]/100)^(1/8))*(112+(0.9*[BME280#Temperature]))+(0.1*[BME280#Temperature])-112

endon

[grovkillen]

We now have an internal formula to do the conversion:

%c_dew_th%(T,H)

Where T is the temperature and H the humidity.