Display metar infomation in pimatic

temp

Hello, can someone help me to display the air pressure from this site http://www.aviationweather.gov/adds/metars/index?submit=1&station_ids=EDDS&chk_metars=on&std_trans=translated
into a pimatic variable? how do I update it out every 5 minutes?

Harry van der Wolf

It can be done but I don’t have the time now (want to go to bed ).
I quickly created a script that splits the lines into 2 variables: “the info” = “the value” which needs html2text (sudo apt-get install html2text)

bash script:

#!/bin/bash

DATA=$(curl -s "http://www.aviationweather.gov/adds/metars/index?submit=1&station_ids=EDDS&chk_metars=on&std_trans=translated" |html2text -width 120)

while read -r line; do
    #echo "$line"
    if [[ $line == *":"* ]]
    then
      var1=$(echo $line | cut -f1 -d:)
      var2=$(echo $line | cut -f2 -d:)
      echo "$var1 =  $var2"
    fi
done <<< "$DATA"

And this results in:

found at http =  //www.aviationweather.gov/adds/metars/
METAR text =   EDDS 302120Z 00000KT CAVOK 06/05 Q1030
Conditions at =   EDDS (STUTTGART/ECHTER, DE) observed 2120 UTC 30 October 2016
Temperature =   6.0°C (43°F)
Dewpoint =   5.0°C (41°F) [RH = 93%]
Pressure (altimeter) =   30.41 inches Hg (1030.0 mb)
Winds =   calm
Visibility =   6 or more miles (10+ km)
Ceiling =   ceiling and visibility are OK
Clouds =   unknown
Weather =   no significant weather observed at this time

This still requires removal of whitespace around the variables $var1 and $var2 and a curl command in the same while loop that uses $var1 as pimaticvariable name and $var2 as value.
I don’t know if I have time tomorrow, but maybe someone else could easily expand it.

That is: if you want variables. Another option is to simply display it in an iframe in pimatic. Examples enough in the forum.

temp

Hello, thanks for the first part. I need the pressure value saved in a pimatic variable to compare it to the bmp180 value. Thanks

Harry van der Wolf

You could have said that you only wanted the pressure.

script to run every x minutes from pimatic with a rule, or from your crontab:

#!/bin/bash

DATA=$(curl -s "http://www.aviationweather.gov/adds/metars/index?submit=1&station_ids=EDDS&chk_metars=on&std_trans=translated" |html2text -width 120 -ascii | grep Pressure)
#echo $DATA
pressure=$(echo $DATA | cut -f2 -d: | cut -f2 -d\(| cut -f1 -dm | sed -e 's/[[:space:]]*$//')

#echo $pressure

curl -s -X PATCH --header "Content-Type:application/json" --data '{"type": "value", "valueOrExpression": "'$pressure'"}' --user "USERNAME:PASSWORD" http://localhost/api/variables/AMRS-pressure

Necessary tools for this script: apt-get install grep curl html2text (mostly grep and curl are already available)
Create a variable AMRS-pressure in your pimatic or change script accordingly. Do not forget to specify a username & password in the script.
Make the script executable: chmod +x <scriptname>

temp

Ergebnis ist:

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
 <head>
  <title>404 - Not Found</title>
 </head>
 <body>
 <h1>404 - Not Found</h1>
 </body>

</html>

Harry van der Wolf

I just tested it on my own pimatic and for me it works fine.

What did you do?

Edit: Did you do this on your pimatic server itself?
if not you can’t use http://localhost/api/variables/AMRS-pressure but should use http://<IP-ADDRESS>/api/variables/AMRS-pressure
And do you use port 80 for your pimatic?
If not you should use http://localhost:<PORT>/api/variables/AMRS-pressure

temp

wrong port sorry…everything is fine…

this crontab line is correct?

*/5 * * * * /home/pi/pressurtest.sh

Harry van der Wolf

Yes,it is.