RaspberryPi: Autoconnect to WLAN (WPA2)

In most applications in robotic it’s necessary to get rid of the ethernet cable to move the raspberry free and battery powered. Luckily the Raspberry PI supports a variety of USB-WLAN-Sticks like the TP-Link TL-WN821N. In this tutorial I describe how you setup the WLAN connection that the RPi auto connects to your WLAN after you switch on the power.
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