So you have a little robot that is based on an Arduino running MRLComm but you really want to cut the USB cord.  Here's what I've done to cut the cord and go wireless via a cheap chinese bluetooth module I picked up on Amazon.

First get yourself an arduino (I've tested this with an Uno, Mega, and Sparkfun Pro Micro 5V) and one of these HC-06 modules. 

You don't have to get yours from that link on Amazon but I like Prime shipping cuz I have to have it NOW!!

So when you get that bad boy you need to need to do a little setup for it to work at the right baud rate when it starts up. Do you remember "AT" commands from back in the days of dialup internet? No? ... then GET OFF MY LAWN!!!! 

You're going to use your Arduino to configure the module before you actually load MRLComm onto the Arduino.  For example if you're using an Uno, connect the GND pin of the HC-06 to a GND pin on the Uno. Connect the VCC pin of the HC-06 to a 5V pin on the Uno.  Connect the RX pin of the HC-06 to pin 11 of the Uno and TX of the HC-06 to pin 10 on the Uno. 

Open your Arduion IDE and load the following sketch I found here (I added the informative comments to the top) to your Uno.

/*This is a simple sketch to setup an HC-06 Bluetooth module via an Arduino and the IDE Serial Monitor

Connect to the arduino at 9600 with No line ending

Connect the power and ground of the HC-06 to the Arduino VCC and GND and connect the module's RX to pin 11 and TX to pin 10

Try different baud rates for "mySerial" until sending an "AT" command produces an "OK" response.

 

AT : check the connection

AT+NAME: Change name. No space between name and command.

AT+BAUD: change baud rate, x is baud rate code, no space between command and code.

AT+PIN: change pin, xxxx is the pin, again, no space.

AT+VERSION

 

AT+NAMEPROTOTYPE will set the name to PROTOTYPE. 

 

To change baud rate, type AT+BAUDX, where X=1 to 9.

1 set to 1200bps

2 set to 2400bps 

3 set to 4800bps 

4 set to 9600bps (Default) 

5 set to 19200bps 

6 set to 38400bps 

7 set to 57600bps 

8 set to 115200bps

so sending AT+BAUD4 will set the baud rate to 9600.

*/

#include <SoftwareSerial.h>

 

SoftwareSerial mySerial(10, 11); // RX, TX

 

void setup() {

 

Serial.begin(9600);

 

pinMode(9,OUTPUT); digitalWrite(9,HIGH);

 

Serial.println("Enter AT commands:");

 

mySerial.begin(9600);

 

}

 

void loop()

 

{

 

if (mySerial.available())

 

Serial.write(mySerial.read());

 

if (Serial.available())

 

mySerial.write(Serial.read());

 

}