Multi rotor fan club

 
 /******                Serial com speed    *********************************/
    /* This is the speed of the serial interfaces */    /* This is the speed of the serial interfaces */
    /* This is the speed of the serial interfaces */
    /* This is the speed of the serial interfaces */

    #define SERIAL0_COM_SPEED 115200
    #define SERIAL1_COM_SPEED 115200
    #define SERIAL2_COM_SPEED 38400
    #define SERIAL3_COM_SPEED 57600

Connect the FTDI USB Adaptor to a PC. The BT adaptor should now be powered with a blinking red led. Before using it with an Arduino running muliwii software, the baud rate of the BT adaptor has to be changed to 115200 from the default 9600. Now this is the part that stumped me for ages and sent me off looking up forums, updating bluetooth stacks etc etc until I figured out what I was doing wrong. To configure the BT adaptor, you need it physically connected to the PC via the FTDI USB adaptor but you don't want to connect the PC to the BT adaptor .... yet. The BT adaptor can only be configured when it's in an un-connected state. In your "Bluetooth Places" you should be able to see the device (by default called "Linvor") but it should show "not connected") and the red light should be flashing on the BT adaptor.
I used Advanced Serial Port Terminal to connect to FTDI USB. The AT commands must be copy and pasted to send to the device because it constantly polls and if you can't type fast enough to complete a command before it reads it in.
Send the "AT" command. BT responds with "OK"
Send "AT+NAMEMultiWiiCopter" to change the default from Linvor.
Send "AT+BAUD8" to change the Baud rate to 115200.
Now connect to the Arduino as per the connections in the table above.
Run the MultiWiiConf software and choose the BT COM port.
Now you can fly around and see the gyro and accelerometer inputs change while in flight!
I found a page with quite a lot of detailed information on the BT adaptor during my searches. While it's native language looks Chinese, the Google Chrome browser seems to do a pretty good job translating it.

Change the Baudrate

The example below shows how to set the baudrate to 4800 bps

Send the command (case sensitive!)

AT+BAUD3

the Bluetooth will reply:

OK4800

As shown in the figure below



Now, since the Baudrate of the Bluetooth has been changed, you need to change the Baudrate of the terminal program to 4800 in order to talk to the Bluetooth again.

The index after the command AT+BAUD corresponds to the following Baudrate:

1----1200bps
2----2400bps
3----4800bps
4----9600bps
5----19200bps
6----38400bps
7----57600bps
8----115200bps
9----230400bps
A----460800bps
B----921600bps
C----1382400bps

The change of Baudrate takes effect immediately after the command is sent. So if you want to keep configuring the Bluetooth module, you need to set the Baudrate of your terminal program to the new Baudrate the Bluetooth is using. To test it, send AT again, you should receive 'OK'.

NOTE: some MAX 232 chips cannot work reliably for Baudrates faster than 115200bps, therefore, we don't recommend to set the Bluetooth to a Baudrate that is faster than 115200bps.



Change name

This example show you how to change the name of the Bluetooth module to hobbyist:

In the terminal program, send the command (case sensitive):

AT+NAMEhobbyist

The Bluetooth should reply:

OKsetname

as shown in the figure below



The Bluetooth needs to be reboot (power off then on) for the name to be changed

Please note that the length of the name cannot exceed 20 characters!



Change pairing code

The following example shows how to change the pairing code to 5566

In the terminal program, send the command (case sensitive):

AT+PIN5566

The Bluetooth should reply:

OKsetPIN

as shown in the figure below



The change of pairing code takes effect immediately.