is some kind of configuration required for HC05 bluetooth module ,when using it for the first time?

[LORD PHOENIX]

i am going to buy an HC05 module from ebay http://www.ebay.in/itm/Bluetooth-mo..._DefaultDomain_203&hash=item43ca41ff56&_uhb=1


i wanted to know is any configuration is required and what to do with the KEY pin

thanks

 

[shumifan50]

As far as I can see the key pin is just to ensure the plug is plugged in correctly,

You will need to configure the UART on the bluetooth module for speed/parity/stopbits/databits or configure the UART on the Arduino to match default settings on the bluetooth module. Also remember the TX of the Arduino UART goes to the RX of the bluetooth and vice versa. Make sure you don't reverse the polarity of the power to the module.