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. [Dastardly] makes a homemad ...

A cheap serial Bluetooth modem from eBay lets him connect to his phone. An Arduino board listens ... to miniaturize the module. We could see this plugging into the USB port on the back of a ...