USB to USB keyboard protocol converter ====================================== Hardware requirement -------------------- Arduino Leonardo http://arduino.cc/en/Main/ArduinoBoardLeonardo Circuit@Home USB Host Shield 2.0 http://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino Build firmware -------------- $ git clone git://github.com/tmk/tmk_keyboard.git $ cd tmk_keyboard $ git checkout usb_hid $ git submodule init $ git submodule update and download LUFA and unzip under protocol/lufa and edit LUFA_PATH in protocol/lufa.mk. Then, $ cd converter/usb_usb $ make You will get usb_usb.hex if you are lucky. Program your Leonardo with avrdude(or easy-going Arduino IDE): $ avrdude -patmega32u4 -cavr109 -PCOM17 -b57600 -Uflash:w:usb_usb.hex Limitation ---------- Only supports 'HID Boot protocol'. Not support keyboard LED yet.