WIFI-2 - OEM WiFi USB module

WIFI-2 is an USB 2.0 module compliant with IEEE802.11 b/g/n. It is based on a RaLink RT5370N chip and fully supported by the latest Kernel Linux versions. It can be mounted directly on a PCB instead of plugged in a USB port and works at 3.3 Volt. It can work in managed, ad-hoc and access point mode.


This module is available in two versions:

  • WIFI-2 which needs an external RF antenna plugged on the i-PEX MHF receptacle
  • WIFI-2-IA without the i-PEX MHF receptacle using the onboard PCB antenna

Both models are available with a 6 pin pitch 2mm solded on semi-holes to be plugged on a female connector or welded directly on the PCB.





  • WIFI-2 pinout

    Pin # Signal Description
    1 TX RF ON/OFF control. Low=OFF. Pull-up to 3V3 with an external 4.7K resistor
    2 3V3 Power supply 3.3 VDC
    3 D- USB data -
    4 D+ USB data +
    5 GND Ground
    6 LED Module working status led output
    7 WPS WPS function. Low level activated

Linux Kernel configuration

This are the driver to enable inside the Linux Kernel to support the WIFI-2 module. Follow these articles to know how to compile the Linux kernel:

To change the Kernel configuration use this command on your Linux PC as described on this article:

make ARCH=arm menuconfig

Thanks set these items:

Device Drivers  --->
  [*] USB support  ---> 
    <*> USB Wireless Device Management support

and these:

Device Drivers > 
  Network device support > 
    Wireless LAN [*]
     [*]   Ralink devices
     <*>   Ralink driver support --->

and then:

--- Ralink driver support
< >   Ralink rt2500 (USB) support
< >   Ralink rt2501/rt73 (USB) support
<*>   Ralink rt27xx/rt28xx/rt30xx (USB) support
[ ]     rt2800usb - Include support for rt33xx devices
[ ]     rt2800usb - Include support for rt35xx devices (EXPERIMENTAL)
[ ]     rt2800usb - Include support for rt3573 devices (EXPERIMENTAL)
[*]     rt2800usb - Include support for rt53xx devices (EXPERIMENTAL)
[ ]     rt2800usb - Include support for rt55xx devices (EXPERIMENTAL)
[ ]     rt2800usb - Include support for unknown (USB) devices
[ ]   Ralink debug output

Package installation

A closed firmware made by RaLink need to be installed. This firmware will be loaded on the module at startup

Change this line in /etc/apt/sources.list

deb http://cdn.debian.net/debian/ buster main


deb http://cdn.debian.net/debian/ buster main contrib non-free

then update the package index by typing

sudo apt update
sudo apt install firmware-ralink

Install iw and wpasupplicant using make menuconfig:

sudo apt install wpasupplicant
sudo apt install iw

Network configuration to get access to a WPA-WPA2-protected Wi-Fi

Add, inside the directory /etc/network/interfaces.d a file called wlan0 by typing:

sudo nano /etc/network/interfaces.d/wlan0

Write these lines and save:

allow-hotplug wlan0
iface wlan0 inet dhcp
    wireless-essid any
    pre-up wpa_supplicant -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf -B
    post-down killall -q wpa_supplicant

Create a file called /etc/wpa_supplicant.conf that contains your access point name and password.

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

Write these lines and save:



Alternatively it is possible to hide the password using wpa_phassphrase by typing:

wpa_passphrase acmetest acmetest



Restart wlan0 with these command or reboot:

sudo ifdown wlan0
sudo ifup wlan0

After a while if the dhcp are working well you will obtain your interface up.