Forward a USB mouse using Arduino Yun

Imagine you would like to monitor, log or modify the output of a standard USB mouse before you pass the signal to another device on which you cannot install software to do these actions. For example you might want to add acceleration or have a universal logging device in which you can simply plug any USB mouse.

Meet my Yun-Mouse project:

This simple project fowards actions (X/Y movement, wheel, left/middle/right mouse buttons) of a USB mouse connected to an Arduino Yun (on the OpenWRT side) as USB HID actions via the micro USB connection (on the ATmega side). This project can get easily modified to add and/or modify the behavior of the mouse (e.g. adding acceleration by multiplying X/Y movement, inverting axis, etc).

Preparing your Arduino Yun

  • Install latest OpenWRT (OpenWrt-Yun 1.5.3) via
  • Setup WLAN. Optionally insert SD Card and expand disk with the DiskSpaceExpander sketch (
  • Connect a USB mouse
  • Restart and wait until the white USB LED is on (indicates Linux boot completed)
  • Connect via SSH (e.g. via Putty)
  • Run the following commands
    opkg update
    opkg install kmod-input-core
    opkg install kmod-input-evdev
    opkg install kmod-usb-hid
    cat /dev/input/event1 | hexdump
    At this point you should see a hexdump when moving the mouse (leave with CTRL-C)
  • Continue with
    wget --no-check-certificate
    opkg install python-evdev_0.4.7-1_ar71xx.ipk
    See for details on why to install evdev this way
  • Download the latest mouse.ino and from
  • Install the mouse.ino sketch via Arduino IDE
  • Transfer to the Yun (e.g. via WinSCP)
  • Start forwarding via