[video] – Connect Your Mailbox to the Internet

Recently I found a video on the web demonstrating a simple system sending push notifications to your iPhone whenever the mailman has delivered your post.

As a part of their “Internet of Things” series ReadWriteWeb came up with an article describing how Make Magazine built the system using an Arduino. This is a nice way of using this technology. In the following you can see the video demonstrating the system.

[youtube W45c9UOvWSo]

I definitely have to try out an Arduino as soon as possible. Anybody interested in hacking up an Arduino project?

[via RWW]

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How to install (Oracle) Sun Java SDK 1.6.x (Java 6) on Ubuntu

Dieser Beitrag beschreibt die Installation des Sun Java SDK 1.6.x on Ubuntu (Maverick). The English explanation on how to install Sun Java SDK 1.6.x can be found here.

Canonical-Partner Repositories aktivieren:

Dies geschieht unter “System” -> “Systemverwaltung” -> “Synaptic Paketverwalung”. In der Paketverwaltung finden sich die Paketquellen unter dem Menüpunkt “Einstellungen”. In den Einstellungen wechselt man auf den Reiter “Andere Software” und aktiviert dort “Canonical-Partner” bzw. “Canonical-Partner (Quelltext)”.  Nach dem Klick auf “Schließen” werden die Paketlisten neu geladen.

Terminal öffnen und Java 6 JDK installieren:

[sourcecode]
$ sudo apt-get install sun-java6-jdk
[/sourcecode]

Java Version zur Standardversion auf dem System machen:

[sourcecode]
$ sudo update-java-alternatives -s java-6-sun
[/sourcecode]

Für das aktuelle Java Development Kit wird der Symlink /usr/lib/jvm/java-6-sun erstellt. Dieser zeigt auf die aktuell installierte Version des JDK.

Installation überprüfen:

[sourcecode]
user@ubuntu:~# java -version
java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) Server VM (build 17.1-b03, mixed mode)
[/sourcecode]

Damit ist die Installation abgeschlossen.

Vielen Dank an Michael Noll für die englische Installationsanleitung, die ich als Vorlage verwendet habe.

Dilbert’s Salary Law

Dilbert’s Salary Theorem states that: “Engineers and scientists will never make as much money as business executives.

Now we have an mathematical proof that explains why this is true:

  • Postulate 1: Knowledge is Power
  • Postulate 2: Time is Money

As every engineer knows,

Power = Work/Time

Since Knowledge = Power we have:

Knowledge = Work/Time.

Since Time = Money we have:

Knowledge = Work/Money.

Solving for Money we get:

Money = Work/Knowledge

Thus, as Knowledge approaches zero, Money approaches infinity regardless of the Work done.

Conclusion: The less you know, the more you Money you make.

[via Thomas H. Fletcher]