BT Shield (Master Slave)

Overview

BT shield V2.2 is a serial port Bluetooth module (with master and slave mode) breakout board, it’s compatible with Arduino and IFlat-32, it can directly plug on Arduino/IFlat-32 board, use UART port for communication with Arduino/IFlat-32 or PC.

Specifications

Microprocessor	CSR BC417
PCB size	53.3mm X 47mm X 1.6mm
Indicators	PWR,State
Power supply	5V DC
IO	6
Communication Protocol	UART/Bluetooth 2.0
RoSH	Yes

Electrical Characteristics

Specification	Min	Type	Max	Unit
Power Voltage	4.5	5	5.5	VDC
Input Voltage VH (Target Voltage = 3.3V)	3	3.3	3.6	VDC
Input Voltage VH (Target Voltage = 5V)	4.5	5	5.5	V
Input Voltage VL:	-0.3	0	0.5	V
Current Consumption	-	20	40	mA

Hardware

UART Multiplexer (For free UART connection setting)

You can use the jumper to connect the TXD and RXD pins of HC-05 to D0, D1, D4~D7 pin of Arduino.

When using the connection as Figure 3, the BT shield connects to the ATMega328 chip on board.

When using the connection as Figure 4, the HC-05 connects with the FT232RL chip, and the FT232RL connect to PC by USB. Whit this configuration you can use the serial software on PC to control or configure the HC-05 module.

Except the 2 configurations above, you can connect the TXD and RXD to any other pins from D4-D7, and using the software-serial library to control the HC-05 module.

Mode Switch

The Mode Set Switch is connected to PIO11, when it is pushed to CMD and powered on, the HC-05 enter command mode, HC-05 module can receive and response AT command in this mode. When it is pushed to DATA and powered on. The HC-05 enters data mode and will not accept AT command.

States LED

When power on and disconnect the port, states LED blinks 1time/2s ; when the module connect and open the serial port, states LED blinks 2times/s.

AT command

1. Test command:

Command	Respond	Parameter
AT	OK	-

2. Reset

Command	Respond	Parameter
AT+RESET	OK	-

3. Get firmware version

Command	Respond	Parameter
AT+VERSION?	+VERSION:<Param> OK	Param : firmware version

Example:

AT+VERSION?\r\n

+VERSION:2.0-20100601

OK

4. Restore default

Command	Respond	Parameter
AT+ORGL	OK	-

Default state:

Slave mode, pin code :1234, device name: H-C-2010-06-01 ,Baud 38400bits/s.

5. Get module address

6. Set/Check module name:

7. Get the Bluetooth device name:

8. Set/Check module mode:

9. Set/Check device class

10. Set/Check GIAC (General Inquire Access Code)

11. Set/Check -- Query access patterns

12. Set/Check PIN code:

13. Set/Check serial parameter:

14. Set/Check connect mode:

15. Set/Check fixed address:

16. Set/Check LED I/O

17. Set PIO output

18. Set/Check – scan parameter

19. Set/Check – SHIFF parameter

20. Set/Check security mode

21. Delete Authenticated Device

22. Delete All Authenticated Device

23. Search Authenticated Device

24. Get Authenticated Device Count

25. Most Recently Used Authenticated Device

26. Get the module working state

27. Initialize the SPP profile lib

28. Inquiry Bluetooth Device

29. Cancel Inquiring Bluetooth Device

30. Equipment Matching

31. Connect Device

32. Disconnect

33. Energy-saving mode

34. Exerts Energy-saving mode

Application Example This is a demo that HC-05 is a master device and communicates to hc-06.

Step 1. Push the mode switch to CMD

Step 2. Power on, module enter command state

Step 3. Using baud rate 38400, send the ―AT+ROLE=1\r\n‖ to module, with ―OK\r\n‖ means setting successes.

Step 4. Send ―AT+CMODE=1\r\n‖, set HC-05 connect to any address, with ―OK\r\n‖ means setting successes.