Development/Tutorials/Sensors

The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

Implementing KSysGuard sensors simple example.

Prequesities: KDE, Perl, nc

Imagine you have a program that monitors some value important for you. You want the value to be plotted or displayed in the KDE systray.

The most _____ way is to add it to KSysGuard as a sensor.

Step 1. Create, for example, "/home/vi/code/sensor/sensor.pl" with the following content: #!/usr/bin/perl -w $|=1;

print "ksysguardd 1.2.0\n"; print "ksysguardd> ";

while(<>){

   if(/monitors/){

	print "random\tinteger\n";

   }
   if(/random/){

	if(/\?/){
	    print "Random Value\t0\t100\n";
	}else{
	    print int(rand()*100),"\n";
	}

   }
   print "ksysguardd> ";

}

Step 2: Launch KSysGuard, File->Connect Host->Custom Command, enter "/home/vi/code/sensor/sensor.pl" in the Command field, OK.

Step 3: Open "127.0.0.1", find "random Integer Value", drag it to some sheet.

You will see your sensor (random value from 0 to 100 in this case).

If you want to see the plot is your systray, follow this:

Step 1: Add "KSysGuard applet to the desktop".

Step 2: In there's no spare displays, choose "Configure System Guard" in the context menu of the applet and increase "Number of displays".

Step 3: Launch KSysGuard, follow previous example to get access to your sensor.

Step 4: Drag and drop from "random Integer Value" to the free display in the systray.

Step 5: "Signal plotter", then you will be asked again to provide the data source. Choose "Custom Command" with the same script.

[Step 6: Open properties and remove grids and lines to clean up the plot]