Requirements

  • Raspberry Pi running Raspbian Jessie with display, mouse, keyboard and power source (see Introduction, steps 1-5)
  • USB wifi dongle (not required for the Raspberry Pi 3)
  • only for the Raspberry Pi Zero: micro-USB to USB adapter
  • Wifi network (WPA) or smartphone with internet connection

Before setting up a wifi connection, you need to setup and configure your Raspberry Pi with Raspbian Jessie like shown in the steps 1-5 in the Introduction.
For wifi, all Raspberry Pis except the Raspberry Pi 3, who comes with onboard wifi, need an USB wifi adapter; the Raspberry Pi Foundation build one optimized for the Raspberry Pi (official wifi dongle). The RPI Zero needs an additional micro-USB to USB adapter.

Smartphone Tethering
This step is only necessary if you don’t have access to a wifi network already!
Smartphones with internet connection are capable of sharing their internet access as a mobile hotspot (tethering). For my Android device, it’s just opening the Configuration, then More..., then Tethering & mobile Hotspot. Choose Setup mobile hotspot, give it a name (SSID), a password, choose WPA2 PSK for security and Save it. The hotspot can now be activated with a checkbox in Tethering & mobile Hotspot.
Find more help in these comprehensive guides for Android and IPhone.

Wireless Internet Connection
Setting up the wifi connection just requires changing the file wpa_supplicant.conf. If necessary, attach the USB wifi dongle, then boot the Raspberry Pi. Open wpa_supplicant.conf with

Enter the name of your wifi network for NETWORK and the network password for PASSWORD. Save and exit by pressing CTRL+x, then y. Reboot the Raspberry Pi then with

and test the internet connection.

Internet connection test
To test the connection, open a terminal and type

If the output is similar to

the internet connection is fine.

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