Examples

Simple countdown

Simple countdown example. Counts down from 10 and displays the text “GO!”. Very low network latency is assumed.

<?
 
require_once('LedSign.php');
$ledSign = new LedSign('192.168.0.106'); // change this to ip of your sign
 
for ($i = 10; $i > 0; $i--) {	
	sleep(1);
	$ledSign->setText($i);
}
 
$ledSign->setText('GO!');
 
?>

Simple monitoring

Example of monitoring the number of users online on a web site. Updates every 5 seconds.

<?
 
require_once('LedSign.php');
$ledSign = new LedSign('192.168.0.106'); // change this to ip of your sign
 
while (true) {
	// url to a script that returns the number
	// of users online in plain text
	$url = 'http://www.mywebcommunity/api/users-online';
	$i = file_get_contents($url);
	$ledSign->setText($i);		
	sleep(5);
}
 
?>

Digg news feed

The following example shows the topics of the
the 20 first popular articles on digg:

<?
 
require_once('LedSign.php');
$ledSign = new LedSign('192.168.0.106'); // change this to the ip of your sign
 
while (true) {
	$url = 'http://feeds.digg.com/digg/news/topic/world_news/popular.rss';
	$rss = file_get_contents($url);
	@$feed = new SimpleXMLElement($rss);
 
	$text = "";
 
	$count = 0;
	foreach ($feed->channel->item as $item){
 
		$title = (string)$item->title;
		$title = LedSign::replaceCurlyBrackets($title);
 
		$text = $text . "$title  |  ";
		$count++;
		if ($count > 20){
			break;	
		}
	} 
 
	$ledSign->setText($text, true);
	sleep(120);
}
 
?>

It results in this: (sorry about the crappy video quality)

Facebook

The following example shows 15 last status updates of
ones friends on Facebook:

 
require_once('LedSign.php');
$ledSign = new LedSign('192.168.0.106'); // change this to the ip of your sign
 
// change this to the address of your friends rss feed
// found under "All friends"
$feedUrl = 'http://www.facebook.com/feeds/friends_status.php'
         . '?id=SOME_ID&key=SOME_KEY&format=rss20&flid=0';
 
while (true) {
 
	// Load the rss feed from Facebook
	// We need to use curl to fake the user agent, because otherwise Facebook
	// responds with an "unsupported browser" error
	$ch = curl_init();
	$userAgent = 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; '
	           . 'fi; rv:1.9.0.4) ' 
	           . 'Gecko/2008102920 Firefox/3.0.4';
	curl_setopt($ch, CURLOPT_USERAGENT, $userAgent);
	curl_setopt($ch, CURLOPT_URL, $feedUrl);
	curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
	$rss = curl_exec($ch);
	curl_close($ch);
 
	@$feed = new SimpleXMLElement($rss);
 
	$text = "{f0}";
 
	$count = 0;
	foreach ($feed->channel->item as $item){
 
		$title = (string)$item->title;
 
		// handle non-ASCII friends
		$title = str_replace('ä', 'a', $title);
		$title = str_replace('Ä', 'A', $title);
		$title = str_replace('ö', 'o', $title);
		$title = str_replace('Ö', 'O', $title);
		$title = LedSign::replaceCurlyBrackets($title);
 
		$text = $text . "$title  |  ";
		$count++;
		if ($count > 15){
			break;	
		}
	} 
	$ledSign->setText($text, true);
	sleep(120);
}
 
?>

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