Arduino serves its first "temperature"

[KenB]

Paul,

I agree, this simple temperature server uses the GET method to re-serve the page when the button is pressed.

It's quite informative to look at the html source using your browser - something like this

<center><p><h1>Arduino Internet Thermometer  </h1></p> <hr><br><form METHOD=get action="http://91.111.101.240/"><h2> Thermistor reads </h2> <h1><font color="#0000FF"> + 17.91  &#176C</font></h1><br> <input type=hidden name=cmd value=1><input type=submit value="Get Temperature"></form>

Here you can see the form, METHOD=get and action="http://91.111.101.240/"  which basically appends the URL and gets the server to re-serve the page.

Lurking in there are the  17.91 characters which is the temperature data.

I've tried the Pachube example code but it has yet to serve me anything at all.  Perhaps the request to my server is not being received correctly or at all??

I am now smoothing 64 successive ADC readings and giving the average temperature.

Well Tomorrow's another day I suppose.


Ken

[Paulh_Boats]

Ken,

That form method returns html type data, which is what the webserver example does and returns the whole html page.

But I was using Javascript code like this in my local browser program:

function UpdateStatus()
{
  xmlHttp = GetXmlHttpObject(StateChanged);
  xmlHttp.open("GET", "http://91.111.101.240" , true);
  xmlHttp.send(null);
}

which is looking for xml content, but the webserver does not return xml content. It only returns http content:

("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<h1>200 OK</h1>"));


However the simpleEEMLserver does return xml content in the HTTP header:

#define HTTP_HEADER "HTTP/1.0 200 OK\r\nServer: arduino\r\nContent-Type: application/xml\r\n\r\n"


GetXmlHttpObject() is used to combine xml data from remote websites in the background, rather than reloading the whole page. So one web page could get temperature data from 4 servers and display the data together, by calling GetXmlHttpObject() with each server's IP address.

Panchube could be calling GetXmlHttpObject() on all the remote servers to get their XML sensor data, not sure though.

Maybe you could ask on the Panchube forum if GetXmlHttpObject() can be/is used on the Arduino.

-Paul

[KenB]

Paul,

Thanks for the suggestion - I'll look at it in the morning.


Ken

[wyleu]

http://195.112.27.196:81/eeml/

A few more sensors for the system. It is data from live sensors but the data set is frozen intentionally at the moment.
That's the minimum, I'll see if I can fill a few more of the other fields...

[KenB]

Guys,

Over the break, I added a few more analogue sources to the Arduino, including a small solar panel taken from a solar garden lamp which then charges a super capacitor.  The solar panel output and the super capacitor voltage are displayed.  (The solar panel is currently placed on a NE facing window sill - so don't expect anything wonderful!)

My Pachube feed is here:

http://www.pachube.com/feeds/1257

One or two minor problems with Pachube,  it doesn't seem to be requesting data from the Arduino at regular time intervals - they seem somewhat random, often with long breaks between readings.  Secondly, the graphs produced on the site are lacking in any reference time or timescale - so that its hard to deduce when events happened.

I am sure that some of these minor shortfalls will be addressed as Pachube is developed further.



Ken