This is redesigned arduino bluetooth shield based on our BC04-A module, arduino stackable, and use use arduino pin 3 and 4 as software serial port for communication.

• Master/Slave selectable, based on BC04-B module
• LED indicator the bluetooth status, fast flashing means not paired yet, constant high status is paired. This is also connect to the arduino digital pin2
• Reset Button can clear the pairing status.
• A lot of standard 2.54 pins available for use.

Settings :

• UART D0/D1 or D3/D4: Use either software serial port of arduino digital pin 3 (RX) and 4 (TX), or original UART port of digital pin 1(TX) and 0 (RX)
• Output/Arduino: Connect the uart of the bluetooth module to either external serial pins or to the arduino board.
• 5V/3V3 Switch: Set the UART logic power level, either 5V or 3V3, keep it at 5V to give the UART pins better power level protection.

1. Datasheet – EDBT Stackable Bluetooth BT Arduino Shield

Device	Shield
Type	BC04-B | Master Slave | Selectable | Bluetooth | 5V/3.3V