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

Command	Respond	Parameter
AT+ADDR?	+ADDR:<Param> OK	Param: address of Bluetooth module

Bluetooth address: NAP: UAP : LAP

Example:

AT+ADDR?\r\n

+ADDR:1234:56:abcdef

OK

6. Set/Check module name:

Command	Respond	Parameter
AT+NAME=<Param>	OK	Param: Bluetooth module name (Default :HC-05)
AT+NAME?	+NAME:<Param> OK (/FAIL)	Param: Bluetooth module name (Default :HC-05)

Example:

AT+NAME=HC-05\r\n set the module name to HC-05

OK

AT+NAME=ITeadStudio\r\n

OK

AT+NAME?\r\n

+NAME: ITeadStudio

OK

7. Get the Bluetooth device name:

Command	Respond	Parameter
AT+RNAME?<Param1>	1. +NAME:<Param2> OK 2. FAIL	Param1,Param 2 : the address of Bluetooth device

Example: (Device address 00:02:72:od:22:24，name：ITead)

AT+RNAME? 0002，72，od2224\r\n

+RNAME:ITead

OK

8. Set/Check module mode:

Command	Respond	Parameter
AT+ROLE=<Param>	OK	Param: 0- Slave 1-Master 2-Slave-Loop
AT+ ROLE?	+ROLE:<Param> OK	Param: 0- Slave 1-Master 2-Slave-Loop

9. Set/Check device class

Command	Respond	Parameter
AT+CLASS=<Param>	OK	Param: Device Class
AT+ CLASS?	1. +CLASS:<Param> OK 2. FAIL	Param: Device Class

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

Command	Respond	Parameter
AT+IAC=<Param>	1.OK 2. FAIL	Param: GIAC (Default : 9e8b33)
AT+IAC	+IAC:<Param> OK	Param: GIAC (Default : 9e8b33)

Example:

AT+IAC=9e8b3f\r\n

OK

AT+IAC?\r\n

+IAC: 9e8b3f

OK

11. Set/Check -- Query access patterns

Command	Respond	Parameter
AT+INQM=<Param>,<Param2>, <Param3>	1.OK 2. FAIL	Param: 0——inquiry_mode_standard 1——inquiry_mode_rssi Param2: Maximum number of Bluetooth devices to respond to Param3: Timeout (1-48 : 1.28s to 61.44s)
AT+ INQM?	+INQM ：<Param>,<Param2>, <Param3> OK	Param: 0——inquiry_mode_standard 1——inquiry_mode_rssi Param2: Maximum number of Bluetooth devices to respond to Param3: Timeout (1-48 : 1.28s to 61.44s)

Example:

AT+INQM=1,9,48\r\n

OK

AT+INQM\r\n

+INQM:1, 9, 48

OK

12. Set/Check PIN code:

Command	Respond	Parameter
AT+PSWD=<Param>	OK	Param: PIN code (Default 1234)
AT+ PSWD?	+ PSWD ：<Param> OK	Param: PIN code (Default 1234)

13. Set/Check serial parameter:

Command	Respond	Parameter
AT+UART=<Param>,<Param2>,<Param3>	OK	Param1: Baud Param2: Stop bit Param3: Parity
AT+UART?	+UART=<Param>,<Param2>, <Param3> OK	Param1: Baud Param2: Stop bit Param3: Parity

Example:

AT+UART=115200，1,2,\r\n

OK

AT+UART?

+UART:115200,1,2

OK

14. Set/Check connect mode:

Command	Respond	Parameter
AT+CMODE=<Param>	OK	Param: 0 - connect fixed address 1 - connect any address 2 - slave-Loop
AT+ CMODE?	+ CMODE:<Param> OK	Param: 0 - connect fixed address 1 - connect any address 2 - slave-Loop

15. Set/Check fixed address:

Command	Respond	Parameter
AT+BIND=<Param>	OK	Param: Fixed address (Default 00:00:00:00:00:00)
AT+ BIND?	+ BIND:<Param> OK	Param: Fixed address (Default 00:00:00:00:00:00)

Example:

AT+BIND=1234，56，abcdef\r\n

OK

AT+BIND?\r\n

+BIND:1234:56:abcdef

OK

16. Set/Check LED I/O

Command	Respond	Parameter
AT+POLAR=<Param1,<Param2>	OK	Param1: 0- PIO8 low drive LED 1- PIO8 high drive LED Param2: 0- PIO9 low drive LED 1- PIO9 high drive LED
AT+ POLAR?	+ POLAR=<Param1>,<Param2> OK	Param1: 0- PIO8 low drive LED 1- PIO8 high drive LED Param2: 0- PIO9 low drive LED 1- PIO9 high drive LED

17. Set PIO output

Command	Respond	Parameter
AT+PIO=<Param1>,<Param2>	OK	Param1: PIO number Param2: PIO level 0- low 1- high

Example:

1. PIO10 output high level

AT+PI0=10，1\r\n

OK

18. Set/Check – scan parameter

Command	Respond	Parameter
AT+IPSCAN=<Param1>,<Param2>,<Param3>,<Param4>	OK	Param1: Query time interval Param2 ： Query duration Param3 ： Paging interval Param4 ： Call duration
AT+IPSCAN?	+IPSCAN:<Param1>,<Param2>,<Param3>,<Param4> OK	Param1: Query time interval Param2 ： Query duration Param3 ： Paging interval Param4 ： Call duration

Example:

AT+IPSCAN =1234,500,1200,250\r\n

OK

AT+IPSCAN?

+IPSCAN:1234,500,1200,250

19. Set/Check – SHIFF parameter

Command	Respond	Parameter
AT+SNIFF=<Param1>,<Param2>,<Param3>,<Param4>	OK	Param1: Max time Param2: Min time Param3: Retry time Param4: Time out
AT+ SNIFF?	+SNIFF:<Param1>,<Param2>,<Param3>,<Param4> OK	Param1: Max time Param2: Min time Param3: Retry time Param4: Time out

20. Set/Check security mode

Command	Respond	Parameter
AT+SENM=<Param1>,<Param2>	1. OK 2. FAIL	Param1: 0——sec_mode0+off 1——sec_mode1+ non_secure 2——sec_mode2_ service 3——sec_mode3_l ink 4——sec_mode_u nknown Param2: 0——hci_enc_mod e_off 1——hci_enc_mod e_pt_to_pt 2——hci_enc_mod e_pt_to_pt_and_b cast
AT+ SENM?	+ SENM:<Param1>,<Param2> OK	Param1: 0——sec_mode0+off 1——sec_mode1+ non_secure 2——sec_mode2_ service 3——sec_mode3_l ink 4——sec_mode_u nknown Param2: 0——hci_enc_mod e_off 1——hci_enc_mod e_pt_to_pt 2——hci_enc_mod e_pt_to_pt_and_b cast

21. Delete Authenticated Device

Command	Respond	Parameter
AT+PMSAD=<Param>	OK	Param: Authenticated Device Address

Example:

AT+PMSAD =1234,56,abcdef\r\n

OK

22. Delete All Authenticated Device

Command	Respond	Parameter
AT+ RMAAD	OK	-

23. Search Authenticated Device

Command	Respond	Parameter
AT+FSAD=<Param>	1. OK 2. FAIL	Param: Device address

24. Get Authenticated Device Count

Command	Respond	Parameter
AT+ADCN?	+ADCN：<Param> OK	Param: Device Count

25. Most Recently Used Authenticated Device

Command	Respond	Parameter
AT+MRAD?	+ MRAD：<Param> OK	Param: Recently Authenticated Device Address

26. Get the module working state

Command	Respond	Parameter
AT+ STATE?	+ STATE：<Param> OK	Param: "INITIALIZED" "READY" "PAIRABLE" "PAIRED" "INQUIRING" "CONNECTING" "CONNECTED""DISCONNECTED" "NUKNOW"

27. Initialize the SPP profile lib

Command	Respond	Parameter
AT+INIT	1. OK 2. FAIL	-

28. Inquiry Bluetooth Device

Command	Respond	Parameter
AT+INQ	+INQ: <Param1>, <Param2>, <Param3> …. OK	Param1：Address Param2 ： Device Class Param3 ： RSSI Signal strength

Example:

AT+INIT\r\n

OK

AT+IAC=9e8b33\r\n

OK

AT+CLASS=0\r\n

AT+INQM=1,9,48\r\n

At+INQ\r\n

+INQ:2:72:D2224,3E0104,FFBC

+INQ:1234:56:0,1F1F,FFC1

+INQ:1234:56:0,1F1F,FFC0

+INQ:1234:56:0,1F1F,FFC1

+INQ:2:72:D2224,3F0104,FFAD

+INQ:1234:56:0,1F1F,FFBE

+INQ:1234:56:0,1F1F,FFC2

+INQ:1234:56:0,1F1F,FFBE

+INQ:2:72:D2224,3F0104,FFBC

OK

29. Cancel Inquiring Bluetooth Device

Command	Respond	Parameter
AT+ INQC	OK	-

30. Equipment Matching

Command	Respond	Parameter
AT+PAIR=<Param1>,<Param2>	1. OK 2. FAIL	Param1 ：Device Address Param2：Time out

31. Connect Device

Command	Respond	Parameter
AT+LINK=<Param>	1. OK 2. FAIL	Param ： Device Address

Example:

AT+FSAD=1234,56,abcdef\r\n

OK

AT+LINK=1234,56,abcdef\r\n

OK

32. Disconnect

Command	Respond	Parameter
AT+DISC	1. +DISC:SUCCESS OK 2. +DISC:LINK_LOSS OK 3. +DISC:NO_SLC OK 4. +DISC:TIMEOUT OK 5. +DISC:ERROR OK	Param ： Device Address

33. Energy-saving mode

Command	Respond	Parameter
AT+ENSNIFF=<Param>	OK	Param ： Device Address

34. Exerts Energy-saving mode

Command	Respond	Parameter
AT+ EXSNIFF =<Param>	OK	Param ： Device Address

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.

Download

Datasheet for BT Shield

Datasheet for BluetoothHC05

Schematic for BT Shield

Useful Links

by Tom <The Missing BT Shield Datasheet>

by And1G <How to work with AT-Command?>

<Upload Program To Arduino With BT Shield>