Mar

5

Pachube dials without the heartache

8 years ago, at the start of March | 1 Comment

Some people might not want to have their own web server and php installs just to use their Pachube feed to show a dial or two so let me introduce to you the simple way of getting this all to work. Go over to my Pachube app page and follow the on screen instructions. You’ll end up with some text to copy and paste into your web page. All done for you all lovely and simple.

Update Added the ability to de-wiggle the value needle, and then fixed a bug in the wiggle.



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March 5, 2009 16:51

Mar

4

Dynamic Dials Disclosed

8 years ago, at the start of March | Leave a Comment

There’s been quite a bit of interest in my electricity usage dial like the one below so I’m going to go through how I did it with you. The first thing you’ll need is the XML/SWF Gauge and a web server with PHP. It’s possible to do this on a web server running Perl or usage dialASP but you’ll need to do that yourself. For this example I’m also using a Pachube account to grab the data. My feed, the one for my gauge on the top right, is 1498 but you will want to create your own account and start updating your own data. Using the gauge is as simple as a simple thing.

There are a number of things we need to get this simple display working,


1. The .SWF file

We’ll come to that at the very end of the article.


2. The gauge.html file.

Open your favourite text editor and cut and paste the following into it.

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<HTML>
<BODY bgcolor="#FFFFFF">
<OBJECT classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
        codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0"
        WIDTH="200"
        HEIGHT="100"
        id="gauge">
<PARAM NAME="movie" VALUE="/data/gauge.swf?xml_source=/getdata.php" />
<PARAM NAME="quality" VALUE="high" />
<param name="wmode" value="transparent">
<param name="allowScriptAccess" value="sameDomain" />
<EMBED src="/data/gauge.swf?xml_source=/getdata.php"
        quality="high"
        wmode="transparent"
        WIDTH="200"
        HEIGHT="100"
        NAME="gauge"
        allowScriptAccess="sameDomain"
        swLiveConnect="true"
        TYPE="application/x-shockwave-flash"
        PLUGINSPAGE="http://www.macromedia.com/go/getflashplayer">
</EMBED>
</OBJECT>
</BODY>
</HTML>

Save the file as gauge.html.


3. A data fetch PHP script.

Start a new document and cut and paste the following. Before you save the file as getdata.php make sure you change the $myFeedId and $myFeedStream values to match your Pachube feed.

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<?
$myFeedId=1498;
$myFeedStream=1;
$myURLPath='/getdata.php';
 
$url = "http://www.pachube.com/feeds/$myFeedId/datastreams/$myFeedStream/history.csv";
 
$now = gmdate('Y-m-d').'T'.gmdate('H:i:s').'Z';
 
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST , false );
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER , false );
curl_setopt($ch, CURLOPT_HEADER, 0);
 
ob_start();
$result = curl_exec($ch);
$resultStr = ob_get_contents();
ob_end_clean();
 
curl_close($ch);
 
if ($result) {
	$readings = split(",",$resultStr);
	$last=(($readings[count($readings)-1])/40);
	$prev=-90+(($readings[count($readings)-2])/40);
	$mval = (max($readings)/40);
	$tval=-90;
 
	header("Content-Type: text/xml\n\n");
?>
	<gauge>
		<update url='<?=$myURLPath;?>?m=<?=$mval?>' delay='909' delay_type='1' timeout='30' retry='9' /> 
<?
		RadialTicks( 100, 75, 60, 15, -90, -45, 12, 3, "33ff33" );
       		RadialTicks( 100, 75, 60, 15, -45, 0, 12, 3, "efe415" );
       	 	RadialTicks( 100, 75, 60, 15, 0, 45, 12, 3, "ef8b15" );
        	RadialTicks( 100, 75, 60, 15, 45, 94, 12, 3, "ff3333" );
?>
      		<text x='40' y='50' width='220' align='left' size='10' color='000000' alpha='20'><?=$now;?></text>
		<text x='150' y='100' width='120' align='center' size='24' color='000000' alpha='100'>Watts (W)</text>
 
       		<rotate x='100' y='75' start='-90' span='<?=$mval?>' step='3' shake_frequency='0' shake_span='3' shadow_alpha='15'>
	                <polygon fill_color='ff0000' fill_alpha='90' line_alpha='0'>
               		        <point x='97' y='5' />
       	        	        <point x='101' y='5' />
                        	<point x='102' y='63' />
               	        	<point x='96' y='63' />
	                </polygon>
			<rect x='94' y='87' width='10' height='10' fill_color='ff0000' fill_alpha='90' line_alpha='50' />
	        </rotate>
 
		<rotate x='100' y='75' start='<?=$prev?>' span='<?=$last?>' step='1' shake_frequency='95' shake_span='3' shadow_alpha='15'>
			<polygon fill_color='000000' fill_alpha='90' line_alpha='0'>
				<point x='100' y='10' />
				<point x='101' y='10' />
				<point x='101' y='63' />
				<point x='96' y='63' />
			</polygon>
			<rect x='94' y='87' width='10' height='20' fill_color='000000' fill_alpha='90' line_alpha='50' />
		</rotate>
		<circle x='100' y='75' radius='14' fill_color='000000' fill_alpha='50' line_alpha='0' />
	</gauge><?
}
 
function RadialTicks ( $x_center, $y_center, $radius,  $length, $start_angle, $end_angle, $ticks_count, $thickness, $color ) {
 
	for ( $i = $start_angle; $i <= $end_angle; $i += ($end_angle-$start_angle)/($ticks_count-1) ) {
 
		echo "		<line x1='".($x_center+sin(deg2rad($i))*$radius).
			"' y1='".($y_center-cos(deg2rad($i))*$radius)."' x2='"
			.($x_center+sin(deg2rad($i))*($radius+$length))."' y2='"
			.($y_center-cos(deg2rad($i))*($radius+$length))
			."' thickness='".$thickness."' color='".$color."' />\n";
	}
}
 
?>

Copy the .swf file that you downloaded from the XML/SWF Gauge site and put it on your web server along with your gauge.html and getdata.php files. Point your browser at your website and the gauge.html page and bask in your glorious meter display.

I should point out that this is using the historic feed data from pachube which has a 15 minute lag. The reason for this is simply because it does not require authentication with the pachube servers. If you want to use your live feed you will need to change the url used and the management of the data returned as well as adding

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curl_setopt($curl, CURLOPT_USERPWD, "username:password");

just before the ob_start(); on line 16. Replace username:password with your actual username and password, don’t forget the colon in between. When changing the url you might want to use the secure https rather than just http.



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March 4, 2009 18:08

Mar

1

Gratifying Graphic Gizmos

8 years ago, at the start of March | 2 Comments

Yesterday the Current Cost unit actually got installed for real, something I was dreading. Dreading not because it was a difficult thing to do but simply because I expected the figure it would show would be terrible. Guess what, it wasn’t. In fact it seemed to be fairly close to that of other people who are monitoring theirs. The initial figure of 371 Watts didn’t last too long once the dishwasher and oven came on and an interesting spike appeared when the hob went on for the kettle.



Continuing with my sudden graphing fetish, as well as using a Current Cost unit I have dotted a number of little devices I’ve built with Xbee and Arduinos to measure temperatures (and other things) around the house. More information on those will come out later, but it’s an interesting project too.

Since I have the data for those it’d be rude not to graph them too, there’s a sample in the thumbnails below.

Not content with graphing them locally I picked up a Pachube invite and started graphing data there too. The process is simple really and as you can see on the right hand side of this page under ‘Graphy Stuff’, graph images can be embedded in your own or other sites. The really interesting thing about Pachube is that you can share your data with people who may be interested. The data they get to see is delayed by approximately 15 minutes. If you output your data in the eeml format then you can specify your own tags too.

Electricity Usage GraphTemperature in the garage



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March 1, 2009 8:47

Current Electricity Use (15min)


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