Want to add Bluetooth to your Arduino or other dev board with a UART? Now you can with this inexpensive Bluetooth HC06 to UART Serial Wireless Adaptor from Tronixlabs. (Click here for the HC05 master/slave version).
This module can be used to create a wireless serial data bridge between your PC, Android smartphone or other Bluetooth-enabled device and your Arduino or other development board.
This is not for Bluetooth connection with Apple iOS devices, they don't support the serial protocol used. Instead, you will need a Bluetooth LE (Low Energy) module.