By default the bluetooth module HC-05 sets baud rate at 38400, data bits 8, Stop bits 1
All schematics of this bluetooth module can be found at : http://pan.baidu.com/s/1o6BiNDS
I used a USB-> TTL usb module connecting to the bluetooth module.
Rx -> Tx on bluetooth module
Tx -> Rx on bluetooth module
Vcc -> 5v
GND -> GND
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getting into AT command line
Hold the key on the bluetooth module when powering it on,
then connect to serial ports on Linux using CuteCom
IMPORTANT:
TRY : CR,LF line end
OR there will be Error (0)
Set serial port baud rate
AT+UART=57600,1,0
baud rate, Stop bits, Even check, ( The AT commands doc provided above in Chinese is wrong. This command is the correct. I verified ! )
Why 57600? Because the tele transport module of drone flight controller board APM 2.6 is going to need this baud rate.: http://ardupilot.org/copter/docs/common-3dr-radio-advanced-configuration-and-technical-information.html
This works with 3DR radio firmware version 1.7 - 1.9 by default.
Set the bluetooth module broadcasting name
AT+NAME='tele'
Check version
AT+VERSION?
Try the module: Phone <-> Bluetooth <-> PC
Use an app called "Bluetooth Terminal HC-05" to connect to the working bluetooth module.
Find the bluetooth module named tele and input password 1234
(By default password is 0000 or 1234)
Open app "Bluetooth Terminal HC-05" select CR(Carriage Return), LF (Line Feed).
Connect the bluetooth module with the USB->TTL dongle to PC and power it on normally.
Use CuteCom connect to /dev/ttyUSB0 , Baud rate: 57600, Data bits 8, Stop bits 1.
Send something from phone to PC, then from PC to Phone. It works like a charm!
Will show how to set bluetooth module with 3DR radio 433Hz transmitter in next blog.