Source code: Code for BT has merged my keyboard firmware now. You can access the code here: https://github.com/tmk/tmk_keyboard Building firmware: $ cd hhkb $ make -f Makefile.iwrap and upload(if you have a proper bootloader) $ make -f Makefile.iwrap program Power Supply: Battery(3.7V/310mAh), charger(LTC4054-4.2), and step-up DC-DC for 5V. [ Guests cannot view attachments ] 23776[/ATTACH] Control