How To Register The Bluetooth Address As "Master".

Interfacing Bluetooth HC-05 and HC-06 with Arduino using AT Commands in Principal Way.

Bluetooth HC-05 pinouts

Connections:

To Bring Bluetooth HC-05 and HC-06 in command way, connect Pivot 34 (command) with 3.3v (Vcc), but remember, when HC-05 or HC-06 will exist in command style, its baud rate volition automatically change to 38400, which is default, no thing what take you gear up your baud rate before for data transfer.

Interfacing Bluetooth HC-05 with Arduino, Connection Diagram - bluetooth device in command/ Master mode

Connect Bluetooth Module HC-05 or HC-06 with Arduino every bit:

Bluetooth	Arduino Mega 2560
1 – TX	RX1
2 – RX	TX1
12 – Vcc	+3.3v
13 – Gnd	GND
34 – PIO11	+3.3v

AT Commands for Bluetooth:

Make sure to utilize CR and \n at the end of each command or in Arduino use Both NL and CR option in Serial Monitor
AT Commands used by HC-05 & HC-06 and most of other Bluetooth Devices

                      Command                 FUNCTION                    ane AT 			Test UART Connection  ii AT+RESET 		Reset Device  3 AT+VERSION 		Querry ﬁrmware version  4 AT+ORGL 		Restore settings to Factory Defaults  5 AT+ADDR 		Query Device Bluetooth Accost  six AT+Name 		Query/Set Device Name  7 AT+RNAME 		Query Remote Bluetooth Device's Proper name  eight AT+Function 		Query/Set Device Role  9 AT+Form 		Query/Set Class of Device CoD 10 AT+IAC 		Query/Set Inquire Access Code  11 AT+INQM 		Query/Set  Inquire Admission Style  12 AT+PSWD 		Query/Set Pairing Passkey  13 AT+UART 		Query/Set UART parameter  14 AT+CMODE 		Query/Gear up Connectedness Mode  xv AT+BIND 		Query/Fix Bounden Bluetooth Address  xvi AT+POLAR 		Query/Set LED Output Polarity  17 AT+PIO 		Set up/Reset a User I/O pin  18 AT+MPIO 		Set/Reset multiple User I/O pivot 19 AT+MPIO? 		Query User I/O pin  20 AT+IPSCAN 		Query/Set Scanning Parameters  21 AT+SNIFF 		Query/Set SNIFF Energy Savings Parameters  22 AT+SENM 		Query/Ready Security & Encryption Modes  23 AT+RMSAD 		Delete Authenticated Device from Listing  24 AT+FSAD 		Find Device from Authenticated Device Listing  25 AT+ADCN 		Query Total Number of Device from Authenticated Device List 26 AT+MRAD 		Query Most Recently Used Authenticated Device 27 AT+State 		Query Electric current Condition of the Device  28 AT+INIT 		Initialize SPP Proﬁle  29 AT+INQ 		Query Nearby Discoverable Devices  30 AT+INQC 		Abolish Search for Discoverable Devices  31 AT+PAIR 		Device Pairing  32 AT+LINK 		Connect to a Remote Device  33 AT+DISC 		Disconnect from a Remote Device  34 AT+ENSNIFF 		Enter Energy Saving style  35 AT+EXSNIFF 		Exit Energy Saving mode

Lawmaking for Arduino Mega:

void setup()
{
Serial1.begin(38400);
Series.begin(38400);
}

void loop()
{
if(Serial1.bachelor())
{
byte a=Serial1.read();
Serial.write(a);
}

if(Serial.available())
{
byte a=Serial.read();
Serial1.write(a);
}

Sequence to Search and Pair a Device:

AT
OK
AT+CMODE=0
OK
AT+ROLE=i
OK
AT+INIT
OK
AT+INQ
+INQ:4D65:4D:CA6612,5A0204,7FFF
OK
AT+BIND=4D65,4D,CA6612
OK
AT+PAIR=4D65,4D,CA6612,xxx
OK

Bluetooth Data Mode:

To bring Bluetooth back in Data Style, simply disconnect Pin34 (PIO11) from +3.3v and leave information technology open / disconnected.

Video on Interfacing Bluetooth Modules with Arduino Mega 2560: