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Bugfixes for IE, Drewpoint for HMS100TF, better arrangement of RSS-Feeds

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git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@122 2b470e98-0d58-463d-a4d8-8e2adae1ed80
This commit is contained in:
martinhaas
2007-12-08 20:16:34 +00:00
parent e1782d5ce7
commit 305a5de4d6
7 changed files with 99 additions and 21 deletions
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21
webfrontend/pgm3/include/functions.php
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@@ -37,6 +37,25 @@ function bft($windspeed) # wind speed in Beaufort
return($bft);
}
# saturation vapour pressure, approximation for
# temperature range 0°C .. +100,9°C
# see http://www.umnicom.de/Elektronik/Projekte/Wetterstation/Sensoren/SattDruck/SattDruck.htm
function svp($temperature) # saturation vapour pressure in hPa
{
$c1= 6.10780; # hPa
$c2= 17.09085;
$c3= 234.175; # °C
return($c1*exp(($c2*$temperature)/($c3+$temperature)));
}
# see http://www.umnicom.de/Elektronik/Projekte/Wetterstation/Sensoren/Taupunkte/Taupunkte.htm
function dewpoint($temp,$hum) # dew point and temperature in °C, humidity in %
{
$svp= svp($temp);
$log= log10($svp*$hum/100.0);
return( (234.67*$log-184.2)/(8.233-$log));
}
function randdefine()
{
@@ -44,7 +63,7 @@ function randdefine()
$rand2 = rand(500,20000);
$rq = md5($rand1.$rand2);
$randdefine=substr($rq,0,5);
return ($randdefine);
return ($randdefine);
}