The Arduino, Bluetooth module (check your specs, some HC-05, and HC-06 may come on a breakout board expecting 5V), and USB Host shield all run off of 3.3V, but devices you want to plug into the ...

An Arduino mini pro provides the brains. A FT-232 USB to serial board is used to program the Arduino. A standard Bluetooth module has to have HID firmware installed.

“Which came first, the HC-05 serial-flash-hack, or the wireless Bluetooth Gamepad? ” Our guess is that [mitxela] wanted to play around with the dirt-cheap Bluetooth modules, and that building ...