Java Math

[k-maub]

I'm a JavaScript noob, so forgive me if this is really easy to do, but I'm trying to make an iGoogle gadget so I can check on my ioBridge from that page.  It's easy enough to dump the embed code sample in a gadget and call it a day.

My main motivation, however, is to do some unique manipulation of the raw data to come up with a meaningful number for that sensor.  For instance, I made my own temperature sensor that is not calibrated to yours, so raw values translate to temperatures in a distinct way which I've figured out.  How do I retrieve the raw value from ioBridge so that I can manipulate it and then display the temperature on my iGoogle gadget?

Basically, I need a way to isolate the raw value from the ioBridge widget; for now, the embed code is just a javascript, and I can't seem to strip away the features and get at the number.

Thanks for any help you may be able to offer.
ryan

[zero*gx]

i would poll the device using the iobridge api. its on the wiki.

parse the return call to get at the data you need, then perform math.

this solution is best scaled for single users or developers. probably isnt the best answer for distributing the gadget.

i dont code javascript, but i do enough programming to understand the flow of what you are doing.

[k-maub]

Ok, great; thanks!  I think you're right.  I had already done some work with Perl accessing the API and parsing a JSON return message.  I should have figured JavaScript would be able to handle JSON as well.  I'll bet it would even deal with XML as well.

I'll give it a shot, and update if anyone is interested in doing something similar.

[zero*gx]

no problem!

id like to see what you do with it.

[anestho]

Has any progress been made on this?  I need to do some scale math too for a gadget. 

[iobridge]

Are you putting the widget on a webpage or using it directly on the ioBridge interface? You can scale the widget using JavaScript if you embed on a page.

[anestho]

I want to embed it into a google gadget in my igoogle personal page.  I tried adding the code to the helloworld.xml but it doesnt work.

[iobridge]

This may help: http://www.iobridge.net/forum/index.php/topic,151.0.html

[k-maub]

Just FYI, here's my code that works for me when I make a "Google Gadget".  Curiously, it only works on a FireFox browser.  If anyone can see stuff I'm doing wrong, I'd appreciate some pointers....

<?xml version="1.0" encoding="UTF-8" ?>
<Module>
  <ModulePrefs title="ioBridge Checker" />
  <Content type="html">
    <![CDATA[
      Hello, world!<br>
Temperature (Raw):<br>
<script type="text/javascript">
document.write(unescape("%3Cscript src='" + "http://www.iobridge.com/widgets/io.js?YOURWIDGETID' type='text/javascript'%3E%3C/script%3E"),'<br>');
</script>
<script type="text/javascript">
function get_tempC() {
var numval = widgetGetValue('YOURWIDGETID');
var res = 10000*numval/(1023-numval);
var beta = 3907;
var r25 = 10000;
var temp = (beta*25-273.15*298.15*Math.log(res/r25))/(beta+298.15*Math.log(res/r25));
  return temp;
}

function update_temp(){
  var newtC = document.getElementById("tempCel");
  var newtF = document.getElementById("tempFahr");
  var newt = get_tempC();
  newtC.firstChild.nodeValue=newt.toFixed(1);
  var temptempF = newt*9/5+32;
  newtF.firstChild.nodeValue=temptempF.toFixed(1);
  }

var temp_out = get_tempC();
document.write('<span id="tempCel">',temp_out.toFixed(1),'</span> &#176C<br>');
var temp_outF = temp_out*9/5+32;
document.write('<span id="tempFahr">',temp_outF.toFixed(1),'</span> &#176F');
setInterval('update_temp()',60000);
</script>

    ]]>
  </Content>
</Module>