Farenheit & Celcius

[N2KI]

Is it possible to display both the Fahrenheit reading along with the Celsius reading?  I could not find a custom tag.

Thanks

Tony - N2KI

[Curly]

Not generaly. What software do you use?

[SLOweather]

Not generaly. What software do you use?

This is in the VWS area...

[N2KI]

Yes I am using VWS.

Tony

[WeatherBeacon]

It should be easy with Javascript ... for someone who knows Javascript.

Okay, I don't know Javascript, but try putting this in your htx template file. Someone who knows Javascript should step in to fix this if it's wrong, please. This will convert Fahrenheit to Celsius (if it works). If it doesn't work, simply remove it.

Code:

<script language="JavaScript">
<!--
   var celsius=0.5555556*(^vxv007^-32);
   document.write(celsius.toFixed(1) + '^uni007^');
-->
</script>

This will convert Celsius to Fahrenheit (if it works):

Code:

<script language="JavaScript">
<!--
   var fahren=1.8*(^vxv007^)+32;
   document.write(fahren.toFixed(1) + '^uni007^');
-->
</script>

Regards,

Kevin...


EDIT:  Oops! I might have jumped the gun in a BIG way! For some dumb reason I assumed you were talking about displaying temp in F and C on a web page. So if the question is, "Can you display temp in both F and C in VWS itself?", then as Curly said, probably not.

[Curly]

I'll rephrase it for you SLO

Since we know you use VWS Tony, do you use any other programs or software to display your weather information?
Javascript, ajax or php can be helpfull if we knew your limitation.

[Carson Weather]

For php websites, rounded to one decimal place:

<?=round(($vxv007-32)*5/9,1);?>&deg;C


***edit- fixed typo. Good eye, WB 

[WeatherBeacon]

For php websites, rounded to one decimal place:

<?=round(($vxv007-32)*5/9,1);?>&degC

Hey, that's slick, Carson! Short and sweet!

Question: should it be &deg;C with a semicolon?

Kevin...

[N2KI]

Sorry for the confusion.  Let me explain a bit clearer.

Currently I am only using VWS to display the weather information and using VWS to create the web page.

My aim here is to display the Celsius equivalent next to the displayed Fahrenheit temperatures that VWS is picking up from the machine and displaying on the web page.

I do not know anything about php(?) and am not currently using javascript.

Any help in those departments is greatly appreciated.

Tony - N2KI

[N2KI]

I tried the Java script and that works. Thank you for the help.  I'm not very savvy in that department.  Thanks again.

Tony

[WeatherBeacon]

I tried the Java script and that works. Thank you for the help.  I'm not very savvy in that department.  Thanks again.

Tony

Glad to hear it! And you're very welcome!

Have fun!

Kevin...

[N2KI]

Kevin,

Can you point me to a link that has sample java script stuff that I can use on the weather web page?  Thank you.

Tony

[weather]

Hi all,

Just for the info :

var celsius=0.5555556*(^vxv007^-32);

Is NOT correct and gives an erroneous reading.

var celsius=(5/9)*(^vxv007^-32);

Is way more precise.

If you take a calculator => 5/9=0,55555555555555555555555555555556  NOT 0.5555556

By experience, I can tell that not using 5/9 returns an 0.5°C difference in the 15°C range, that's a lot...

Hope it helps.

.

[WeatherBeacon]

Hi all,

Just for the info :

var celsius=0.5555556*(^vxv007^-32);

Is NOT correct and gives an erroneous reading.

var celsius=(5/9)*(^vxv007^-32);

Is way more precise.

If you take a calculator => 5/9=0,55555555555555555555555555555556  NOT 0.5555556

I understand that (math prof here ).

By experience, I can tell that not using 5/9 returns an 0.5°C difference in the 15°C range, that's a lot...

I'd like to know why that might be if anyone knows. Using a factor of 0.5555556 instead of 5/9 will produce an error of 0.000008% regardless of the temp in Fahrenheit. That's only 8-millionths of one percent. For example:

      (5/9)*(59-32)  =  15^oC  exactly

while

      0.5555556*(59-32)  =  15.0000012^oC

which gives only a 0.000008% error. So why would you get an error of 0.5^oC?

[mackbig]

I think he might be confusing 0.5555556 with a script that used .57

That script would casue a 0.39C conversion error at 15C

Andrew

[weather]

My appologies guys, you are correct.

I was confusing with the script of an other Guru @ Saratoga-weather.org
who wrote in his great ajax "ajaxVWSwxf.js" script :

http://saratoga-weather.org/AJAX/VWS/ajaxVWSwxf.js

// utility functions to handle conversions from clientraw data to desired units-of-measure
function convertTemp ( rawtemp ) {
   var retval = 0;
   if (uomTempCnvt == 0) { // leave in F
      retval = rawtemp * 1.0 ;
   } else {  // convert to C
      retval = (rawtemp - 32) * 0.57;
   }
   return(retval.toFixed(1));
}

It took me hours before finding this definite mistake. I kindly did advise him
thru his mail form on his site and he did not find it necessary to respond.

I also like the :  retval = rawtemp * 1.0 ;   

This is why I am getting carefull now. Besides that his script is really great.

Sorry again.