View source for Wifi adapter user manual

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'''Step 1''': Insert Wifi adapter into the USB interface of the Raspberry Pi.
'''Step 2''': Start the Raspberry Pi, modify the network configuration file under /etc/network/interfaces. After modification, it is shown as follows:
<pre>
auto lo
iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
auto wlan0
iface wlan0 inet dhcp
wpa-ssid "your_wifi_SSID"
wpa-psk "your_wifi_password"
</pre>
'''Step 3''': Save, exit and restart the Raspberry Pi.
Type ip addr on terminal and press Enter, you should see the Raspberry Pi has obtained the IP address by Wifi Adapter.
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