No wire! Best fit for RMS style. It is a keyboard for nomad hackers!Source code:
Code for BT has merged my keyboard firmware now.
You can access the code here:
https://github.com/tmk/tmk_keyboardBuilding 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.
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Controller: ATMega168P(5V)
3.3V regulator and 3.3V/5V converter for Bluetooth module.
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Bluetooth Module: Bluegiga WT12(3.3V)
Power switch and LEDs.
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Back: Power switch and LEDs on left window, header pins of UART and reset switch on right window.
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Overall,
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Circuit
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2011/10/04 fixed 5V-3.3V level shift