website HC-05
Eagle files adapter-board
HC-05 Breakout Board
HC-05 Breakout Board notes:
the HC-05 module can work in two modes, communication and configuration
configuration mode can be activated by connecting the KEY pin to 3.3v (use a jumper on the breakout board)
default baud rate for both modes is 38400, it is possible to change the baud rate of the communication mode with AT+UART=9600,0,0
more info about the modes and the configuration
here