Hey guys,
I made a web controlled thermostat out of my arduino:
the server is at varano.eu.pn, check it out if you want, and the arduino runs a GET command on the server to find out what temperature I set.
I would also like the arduino to POST data to the server, for example the room temperature it already displays on its screen.
I have no idea where to start... can someone suggest me a path? What will my php say? what does the arduino do?
Thanks!
E 
and the arduino runs a GET command on the server to find out what temperature I set.
So, you know how to use a GET command to trigger a php script. And, you know how to write a php script to respond to a GET command.
I would also like the arduino to POST data to the server
Why? The differences between a POST command and a GET command are rather trivial. If you already know how to GET a script to do something, why not go with that approach?
POST is usually used when trying to hide the data that the script needs from prying eyes. I fail to see how the temperature in your room is a secret bit of data, or why you care if a packet sniffer sees the temperature.
Here are GET and POST method examples:
http://playground.arduino.cc/Code/WebClient
You might have to mix and match the setup functions to use the proper network assigment for your localnet.
So PaulS,you're saying that i can just do the inverse? Get the server to run a GET on the arduino??
Any more clues? 
Thanks !
Thanks SurferTim, I was looking for some examples!
Last week I had done a small script to connect my arduino to Mysql with a GET method.
Here is my script:
<html>
<?php
$value = $_GET['value'];
//echo $value;
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//Get date and time
// Return date/time info of a timestamp; then format the output
$mydate=getdate(date("U"));
$timestamp = "$mydate[year]-$mydate[mon]-$mydate[mday] $mydate[hours]:$mydate[minutes]:$mydate[seconds]";
//-----------Setup Mysql Connection
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$user = 'energy';
$pass = 'monitor';
$hostname = 'localhost';
$databaseName = 'energymonitor';
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$linkSQL = mysqli_connect($hostname,$user,$pass,$databaseName);
Â
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if (mysqli_connect_errno())
 {
 echo "Failed to connect to MySQL: " . mysqli_connect_error();
 }
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//Construct the sql query and store it in a varaible
$sql="INSERT INTO sensores (name, value,date) VALUES('modem','$value','$timestamp')";
if (!mysqli_query($linkSQL,$sql))
{
die('Error: ' . mysqli_error($linkSQL));
}
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echo 'Success';
mysqli_close($linkSQL);
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?>
</html>
With this script you can pass data using http://localhost/myscript.php?value=99
It could give you an idea how simple a a GET method could be done.
So PaulS,you're saying that i can just do the inverse? Get the server to run a GET on the arduino??
Any more clues?
No. A GET request can have "arguments" though.
GET /script?arg1=val1&arg2=val2&arg3=val3
The script (recordTempertature.php for instance) then uses the $_GET array to get the name=value pairs, and uses the values as required.
As HugoPT illustrates.
Ok thanks a lot guys!
I think I get it...
I'll post my code if i cant get it to work
Ciao!
YO!
not working...
code running on arduino:
if (client.connect(serverName, 80)) {
   // Serial.println("connecting...");
   // send the HTTP PUT request:
   client.print("GET http://varano.eu.pn/arduino.php?t=");
   client.print(TEMPr);
   client.println(" HTTP/1.0");
   // client.println("Host: www.arduino.cc");
   // client.println("User-Agent: arduino-ethernet");
   // client.println("Connection: close");
   client.println();
  }
this is my server's code
<html>
<?php
 // ARDUINO TO WEB SERVER
 $t = $_GET['t'];
 file_put_contents('arduino-temp.txt', '<'.$t.'.0'.'>');
 //return 'ok';
?>
</html>
arduino-temp.txt remains blank...
It shouldn't...
What's wrong?
Love you guys 
   client.print("GET http://varano.eu.pn/arduino.php?t=");
The Arduino only communicates using one protocol, so the http: bit is not necessary. The client.connect() call has already connected to the server, so the server name is not necessary.
Try:
   client.print("GET /arduino.php?t=");