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

Interfacing Bluetooth Modules HC-05, HC-06, JY-MCU BT_BOARD v1.02 and v1.03 with Arduino Uno and Arduino Mega 2560

This tutorial guides you, how to interface Bluetooth module with Arduino UNO and Arduino Mega 2560. Interfacing HC-05, HC-06, JY-MCU v1.02 or v1.03 with Arduino Uno or Arduino Mega 2560 using two serial ports.

HC-05 Pinouts:

Bluetooth HC-05 pinouts

HC-05 & HC-06 have different pin numbers of LEDs only, power and Serial Communication pins are same.

JY-MCU Pinouts:

Bluetooth JY-MCU Pinouts

JY-MCU BT_BOARD v1.02 and v1.03 have same pinouts.

Connections:

Interfacing bluetooth HC-05 with Arduino, Connection Diagram

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

Interfacing bluetooth HC-05 with Arduino, Connection Diagram - JY-MCU

Connect Bluetooth Module JY-MCU BT_BOARD v1.02 and v1.03 with Arduino as:

Bluetooth JY-MCUArduino Mega 2560Arduino Uno
1 – GndGNDGND
2 – Vcc+5v+5v
3 – RXTX1TX
4 – TXRX1RX

Connect HC-05 or HC-06 with Arduino as:

BluetoothArduino Mega 2560Arduino Uno
1 – GndGNDGND
2 – Vcc+3.3v+3.3v
3 – RXTX1TX
4 – TXRX1RX

Code for Arduino Mega:

void setup()
{
Serial1.begin(9600);
Serial.begin(9600);
}

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

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

}

 

Code for Arduino Uno:

As Arduino Uno has only one serial port. So we will connect Bluetooth Module with RX and TX pins of Arduino Uno. This code will continuously transmit text “GalaxySofts” and “http://www.galaxysofts.com” with a delay of 1 second.

void setup()
{
Serial.begin(9600);
}

void loop()
{
Serial.println(“GalaxySofts”);
Serial.println(“http://www.galaxysofts.com”);
delay(1000);
}

Video on Interfacing Bluetooth Modules with Arduino Uno and Mega 2560:

 

 

 

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