Put into Library

šŸš§ Developers
1

Iā€™ll admit - Hobbiest, just getting started with making my own apps/drivers (which I find fun).

Today I decided to look into this ā€œLibrary Codeā€: I donā€™t find much on it so I thought I would add a comment to help other hobbiest in their adventure. I have a couple of Apps and one Driver that use a function to calculate dew point. Today I learned that I can have that function in one location instead of in each location I need it. This would have been fantastic during the development of that function so I wouldnā€™t need to change it in multiple locations as I found errors.

Code that was in 3 different locations:

def dewpt(temp,humid) {
    double lnPws
    double Pws
    double Pw
    double lnPw
    
    C1=-10214.165
    C2=-4.8932428
    C3=-0.005376579
    C4= 0.000000192024
    C5= 0.000000000355758
    C6= -0.0000000000000903447
    C7=4.1635019
    C8=-10440.397
    C9=-11.29465
    C10=-0.027022355
    C11=1.28904e-5
    C12=-2.47807e-9
    C13=6.5459673
    ln=0.4342944819
    Tr=459.67+temp
    if (temp < 32) {
        lnPws=C1/Tr + C2 + C3*Tr + C4*Tr**2 + C5*Tr**3 + C6*Tr**4 + C7*Math.log(Tr)
    } else {
        lnPws= C8/Tr + C9 + C10*Tr + C11*Tr**2 + C12*Tr**3 + Math.log(Tr)*C13
    }
    Pws= Math.exp(lnPws)
    Pw=humid*Pws/100
    lnPw=Math.log(Pw)
    if (temp < 32) {
        Td=(90.12+26.412*lnPw+0.8927*lnPw**2).round(2)
     } else {
        Td=(100.45+33.193*lnPw+2.319*lnPw*lnPw+0.17074*lnPw**3+1.2063*Pw**0.1984).round(2)
     }

    return Td
}

As a Library Code I moved this code from each of those locations to a library with this added prior to the code:


/******************************************************************************\    
 *              Dew Point Calculation Funcion                                 *
 *
 *         to use call the function with #include ERA6515.dewpoint
 *                                                                #include [namespace.name]
 *
 *         then in the app / driver use it by:
 *         double dpTemperature = dewpt(temperature,relativeHumidity)
 *         
 *         temperture and relativeHumidity are float or larger real numbers
 *         the function returns a double real number
 *
 *
 *  2023 No Rights Reserved
 *  Kokopelli Home Automation  (eric albright)
 *
 ******************************************************************************\
*/

library (
  author: "Kokopelli Home Automation",
  category: "function",
  description: "Dew point calculation",
  name: "dewpoint",
  namespace: "ERA6515",
  documentationLink: "n/a"
)

AND ADDED this code to the Apps and Driver that was using it:

#include ERA6515.dewpoint

If I made mistakes in it I would like to know so I can keep improving.

1 Like
2

That looks right and also seems to all be documented here:

3 Likes
3

Remembering the ā€˜DLL hellā€™ from the past, I am still cautious using libraries in HEā€¦ But as the common code in my drivers becomes more and more huge part of the different devices drivers, seems like there is no other way to go.