how to install TP-Link wifi dongle drivers to raspberry PI (realtek driver)

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The TP-Link WiFi dongle is a convenient accessory for Raspberry Pi users seeking wireless connectivity. (Mainly necessary for raspberry PI versions without Wifi integrated). Though its setup might not be straightforward, following these step-by-step instructions will assist in getting it up and running smoothly.

Introduction

This guide assumes the utilization of an Ethernet connection initially for accessing the Raspberry Pi. The process involves updating the system, installing essential packages, fetching and installing firmware, configuring network settings, and finally, connecting to a WiFi network using the TP-Link TL-WN725N Nano WiFi dongle.

Step 1: Prepare and Install Necessary Packages

Ensure your Raspberry Pi system is up to date and install required packages:

sudo apt-get update && sudo apt-get install -f 
sudo apt-get dist-upgrade
sudo apt-get install -y build-essential git linux-headers raspberrypi-kernel-headers 
sudo reboot

Step 2: Get and Install Firmware for TP-Link-WN725N Nano

Fetch the firmware from the GitHub repository:

git clone https://github.com/lwfinger/rtl8188eu.git 
cd rtl8188eu 
make 
sudo make install 
sudo reboot 
sudo shutdown -h now

Step 3: Check Recognition of WiFi Dongle

Upon startup, check if the system recognizes the WiFi dongle:

lsusb 

# Check for Realtek RTL8188EUS Wireless Network Adapter

lsmod 

# Look for ‘8188eu … 0’ ifconfig -a # Ensure wlan0 is present without an IP address

Step 4: Setup WiFi Settings

Modify the network interfaces file to include WiFi configuration:

sudo vi /etc/network/interfaces 

If not present add:

auto wlan0

after append to the end of the file

allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

Step 5: Connect to WiFi

Edit the wpa_supplicant.conf file (located here /etc/wpa_supplicant/wpa_supplicant.conf) to include WiFi network credentials:

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf 
# Add the following lines:
network={
ssid="YOUR_NETWORK_NAME"
psk="YOUR_NETWORK_PASSWORD"
proto=RSN key_mgmt=WPA-PSK pairwise=CCMP auth_alg=OPEN
}

Replace YOUR_NETWORK_NAME and YOUR_NETWORK_PASSWORD with your WiFi details.

Reboot the Raspberry Pi:

sudo reboot

Verify WiFi connectivity:

ifconfig -a # Check for an IP address next to 'wlan0'

Congratulations! Your Raspberry Pi should now be connected to the specified WiFi network using the TP-Link WiFi dongle.

the reference of this post is the following file:
https://gist.github.com/MBing/de297a8ae5e8a191c55a67a568d20d31#file-install_wlan_dongle-sh

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