1 USB to USB keyboard protocol converter
2 ======================================
7 http://arduino.cc/en/Main/ArduinoBoardLeonardo
9 Circuit@Home USB Host Shield 2.0
10 https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino-assembled/
12 Buying Arduino Leonardo and USB Host Shield 2.0(from Circuit@home) will be the easiest way, you won't need even soldering iron.
13 Arduino's Shield will also work well but I think Sparkfun's needs to be modified.
15 http://arduino.cc/en/Main/ArduinoUSBHostShield
16 https://www.sparkfun.com/products/9947
18 Also Pro Micro 3.3V(not Mini) or Teensy with mini host shield will work with some fixes on signal/power routing.
19 https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-for-arduino-pro-mini
20 https://www.sparkfun.com/products/12587
21 https://www.pjrc.com/teensy/td_libs_USBHostShield.html
27 $ git clone git://github.com/tmk/tmk_keyboard.git
30 $ git submodule update
31 $ cd converter/usb_usb
34 Program converter. Push reset button on Leonardo before run this command. Serial port name(COM17) depends your system. On Linux I got /dev/ttyACM0.
36 $ DEV=COM17 make program
38 $ avrdude -patmega32u4 -cavr109 -b57600 -Uflash:w:usb_usb.hex -PCOM17
44 Only supports 'HID Boot protocol'.
45 Not support keyboard LED yet.
47 Note that the converter can host only USB "boot protocol" keyboard(6KRO) and not NKRO, it is possible to support NKRO keyboard but you will need to write HID report parser for that. Every NKRO keyboard can have different HID report and it is difficult to support all kind of NKRO keyboards in the market.
53 2014/12/11 Added Hub support(confirmed with HHKB pro2)
60 https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-2-0-for-arduino
61 https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-for-arduino-pro-mini
62 USB Host Sheild 2.0 source
63 https://github.com/felis/USB_Host_Shield_2.0
64 Arduino USB Host Shield(with bootst converter)
65 http://arduino.cc/en/Main/ArduinoUSBHostShield
67 https://github.com/arduino/Arduino/hardware/arduino/{cores,variants}
68 Initial release of TMK USB-USB converter
69 https://geekhack.org/index.php?topic=33057.msg653549#msg653549
70 http://deskthority.net/workshop-f7/is-remapping-a-usb-keyboard-using-teensy-possible-t2841-30.html#p74854
71 Arduino-based hardware keyboard remapper - Colemak forum
72 http://forum.colemak.com/viewtopic.php?id=1561
74 http://www.pjrc.com/teensy/td_libs_USBHostShield.html