# how do I change baud rate for bluesmirf without connecting to pc?

Hi I have the sparkfun bluetooth mate silver. I am trying to start working on control via bluetooth for my Arduino. Only thing is I need to set the baud rate for the bluetooth mate, all guides I can find on the net show how to change it via pc. I do not have bluetooth connectivity on my PC. Is there a way to do it via the Arduino?

• I suppose that obtaining a $2 USB Bluetooth radio is not an option? – AndrejaKo Jun 5 '11 at 14:04 • not today. I will eventually – Mark W Jun 5 '11 at 17:09 ## 1 Answer To change the Baud rate on the BlueSmirf, you will need to enter Command mode. To enter Command mode, you need to send "$$" through the serial port connection. This can be done from a PC using a terminal program or from the Arduino. Since you want to do this from the Arduino, you will need to write a little bit of code to parse the responses from the BlueSmirf so you can automate the steps necessary to change the Baud rate. 1. Send "$$$" - Enter Command Mode
2. Wait for "CMD" - Acknowledge in Command Mode
3. Send "SU,96" - Change Baud rate to 9600
4. Wait for "AOK" - Acknowledge command
5. Send "R,1" - Reboot device to use new setting

All the commands are documented in the RN-42 AT Command Set