First, we'll change the baud rate as described by Oscar. Use this link if you're using an Arduino to change the baud.

Using my cool CP102 USB to UART adapter, I tried following the directions from painless360, summarized below, but I couldn't change my com port. Turns out you need to run Arduino as an administrator to change the COM port. Also those commands are for the new HC-06.

Here is another great guide I used, specific to the HC-05 I ordered.

The HC-05 is different from the HC-06 in 2 respects, it requires the button be depressed when powering on to go into AT mode and it wants both NL and CR sent with the command. Also, my UART to USB adapter has the option of 3 or 5v. 3v didn't work, so I had to use 5v.

• Plug it in
• Open the Arduino Studio
• Open the serial Monitor
• Pick "Both NL & CR"
• Set serial monitor BAUD to 9600
• NOTE: Not sure why this is, but my board wouldnt work unless I set the BAUD to 38400. If the following doesnt work, try the AT command with every BAUD until you find the right one.
• Also note, the AT+UART command, which returns the BAUD, showed that it was running 9600,0,0. Edit: This is for non-AT mode.
• Type AT
• It should say "OK"
• Change BAUD enter AT+UART=115200,1,0 where 1 is the stop bit and 0 is the parity. On the HC-06 the command is just AT+BAUD8 More documentation for the HC-05 is available at iteadsstudio.com
• It should say OK on the HC-05, OK115200 on the HC-06
• This will change the BAUD in bluetooth mode, not the baud in AT mode, so your connection should remain open
• Change the name, on the HC-05 AT+NAME? doesnt seem to work
• For the HC-06: AT+NAMEputhtenamehere, e.g. AT+NAMESuperCopter
• Check the pin with AT+ PSWD? and set it with AT+ PSWD=0000 where 0000 is your pin
• Use AT+PIN1234 for the HC-06
• If you're using a cc3d like me, here's how you wire it onto your copter