Overview
Things
Story

Steps for HC-05 module:
Steps for pairing:

Published October 11, 2016

Bluetooth Chat

Enable a chatting interface between two serial monitors.

IntermediateFull instructions provided5 hours9,210

Things used in this project

Hardware components

Arduino UNO

HC-05 Bluetooth Module

Bluetooth module HC-0

Software apps and online services

Arduino IDE

Story

I have used a HC-05 Bluetooth module which can be a master or a slave depending on the mode and a HC-06 Bluetooth module which is a slave.

Steps for HC-05 module:

The connections are shown in the schematic diagram. The Pin 34 should be kept high (3.3v) to ensure that the module enters into AT mode.

In the Serial monitor type the command AT+ROLE=1. This sets the HC-05 in master role.

Steps for pairing:

The communication mode baud rate (9600 bauds) has to be the same on both the devices.

We have to ensure that the passwords of both the devices should be same. This can be checked by typing AT+PSWD in the AT mode.

For HC-05 in AT mode, we should send the command AT+RMAAD which clears any previously paired devices and after that, by entering AT+RESET, the HC-05 is reset. Then enter the command AT+CMODE=0 which allows the HC-05 to connect to any device. Now enter the AT+INQ command which searches for Bluetooth devices. For my HC-06, the HC-05 module returned +INQ: 7683:10:171179, 1F00,7FFF which has the address of the HC-06 module.

For pairing the HC-05 to the HC-06, I used the command AT+PAIR=7683, 10, 171179,10. The pairing was successful and got an acknowledgement: OK.

For binding, I used the command AT+BIND=7683, 10,171179 and then entered the command AT+CMODE=1 which makes the HC-05 connect to only paired devices. Entering the command AT+LINK=7683, 10,171179 in the HC-05 links the HC-05 to the HC-06.

Now remove the pin34 to use the HC-05 communication mode and upload the code and test the chat.

This is the video URL: https://drive.google.com/open?id=0By8j-l_LkCjDelZONmJRWjJCYUE

Code

#include <SoftwareSerial.h>
SoftwareSerial BTserial(4,2); // RX, TX
 
char c=' ';
 
void setup() 
{
    // start the serial communication with the computer
    Serial.begin(9600);
    Serial.println("Arduino with HC-05 is ready");
 
    // start communication with the HC-05 using 9600
    BTserial.begin(9600);  
    Serial.println("Bluetooth serial started at 9600");
}
 
void loop()
{
 
     // Read from HC-05 and send to Arduino Serial Monitor
    if (BTserial.available())
    {  
        c = BTserial.read();
        Serial.write(c);
    }
 
    // Read from Arduino Serial Monitor and send to HC-05
    if (Serial.available())
    {
        c =  Serial.read();
        BTserial.write(c);  
    }
 
}

#include <SoftwareSerial.h>
SoftwareSerial BTserial(4,2); // RX , TX

char m=' ';
 
void setup() 
{
    Serial.begin(9600);
    Serial.println("Arduino with HC-06 is ready");
 
    // HC-06 default baud rate is 9600
    BTserial.begin(9600);  
    Serial.println("Bluetooth Serial started at 9600");
}
 
void loop()
{
 
  // Read from HC-06 and send to Arduino Serial Monitor
  if (BTserial.available())
  {
    m = BTserial.read();
    Serial.write(m);
  }
 
  // Read from Arduino Serial Monitor and send to HC-06
  if (Serial.available())
  {
    m=Serial.read();
    BTserial.write(m);
  }
  
}

Credits

Bharath Rao M

3 projects • 24 followers

An electronics hobbyist.

Bluetooth Chat

Things used in this project

Hardware components

Software apps and online services

Story

Steps for HC-05 module:

Steps for pairing:

Schematics

HC-05 connections

HC05

HC-06 connections

HC06

Code

HC-05 Arduino code

HC-06 Arduino Code

Credits

Bharath Rao M

Comments

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Bluetooth Chat

Bluetooth Chat

Things used in this project

Hardware components

Software apps and online services

Story

Steps for HC-05 module:

Steps for pairing:

Schematics

HC-05 connections

HC05

HC-06 connections

HC06

Code

HC-05 Arduino code

HC-06 Arduino Code

Credits

Bharath Rao M

Comments

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