새로운 블루투스 모듈 bt_board v1.5

블루투스RC카-완성 2013. 4. 22. 15:33

Bluetooth protocal : Bluetooth Specification v2.0+EDR
Frequency : 2.4GHz ISM band
Modulation : GFSK(Gaussian Frequency Shift Keying)
Emission power : <=4dBm, Class 2
Sensitivity : <=-84dBm at 0.1% BER

Speed : Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1Mbps

Security : Authentication and encryption
Profiles : Bluetooth serial port

CSR chip : Bluetooth v2.0
Wave band : 2.4GHz-2.8GHz, ISM Band
Protocol : Bluetooth V2.0
Power Class : (+6dbm)
Reception sensitivity: -85dBm
Voltage : 3.3 (2.7V-4.2V)
Current : Paring – 35mA, Connected – 8mA
Temperature : -40~ +105 Degrees Celsius
User defined Baud rate : 4800, 9600, 19200, 38400, 57600, 115200, 230400,460800,921600 ,1382400.
Dimension : 26.9mm*13mm*2.2mm

Default serial port setting : 9600, N, 8, 1
Pairing code : 1234
Running in slave or master role

Pinout

Key : ??
Vcc : 3.6v to 6v
GND
TXD : link to opposite side RX (TTL 3v3 on this revision)
RXD : link to opposite TX (TTL 3v3 on this revision)
STATE : HIGH : command mode, LOW : operation mode.Active command mode with a 10K pull-up resistor.
Onboard red led (PIO9) : Used to control LED indicating paring. It will be steady on when paring is successful.

Note that I/O is 3v3 TTL level, and does not accept 5v. To convert to/from, for instance, an Arduino, you can use a voltage divider or with two resistor where one is a pull-down, like in open brain wave interface hardware for RX and a FET for TX. This is true for this actual revision, 1.05. Version 1.2 accepts 5v level signals. You can also use a level shifter, likethis one. Note that newer MCU uses directly 3.3v, and thus the JY-MCU is useable directly (Stellaris Launchpad, STM32 Discovery..).

Command mode

Default serial port setting in command mode : 9600, N, 8, 1

Use a serial adapter like uartsbee, and connect the JY-MCU using local serial port (the bluetooth port will not answer to AT commands).

Use NOTHING end line : no CR nor LF.

Test using plain « AT » command : the board must answer « OK » if ready to answer AT commands.

Activation

Poweroff, put a 10k pull-up resistor on the « state » pin (PIO11), power on.

Command list

Command	Answer	Values
AT+PINxxxx	OKsetPIN	Set pairing code
AT+BAUDx	OkxxxxxxxxBAUD	1(1200bps), 2(2400bps), 3 (4800bps) , 4 (9600bps) , 5 (19200bps) , 6 (38400bps) , 7 (57600bps), 8 (115200bps) , 9 (230400bps) , A (460800bps), B (921600bps), C (1382400bps)
AT+NAMExxxxxx	OKsetname
AT + ROLE = 1	OK	1 to set as master, 0 to set a slave