Arduino and HC-06 bluetooth example

by shedboy71 24th May 2016

In this example we will add bluetooth support to our Arduino, there are several low cost modules labelled either Hc-05 or HC-06. Here is a picture of one of them

hc-06

In this example we will connect one of these modules to our Arduino, use the software serial library and using a terminal program send a command via your PC and switch the on board LED on and off. First lets take a look at the schematic

Schematics

As you can see the connections are as follows in the schematic below

arduino and hc05

Code

Upload the following to your Arduino

[codesyntax lang=”cpp”]

#include <SoftwareSerial.h>// import the serial library

SoftwareSerial BT(10, 11); // RX, TX
int ledpin=13; // led on D13 will show blink on / off
int BluetoothData; // the data given from Computer

void setup() 
{
  // put your setup code here, to run once:
  BT.begin(9600);
  BT.println("Bluetooth On please press 1 or 0 blink LED ..");
  pinMode(ledpin,OUTPUT);
}

void loop() 
{
  // put your main code here, to run repeatedly:
  if (BT.available())
  {
    BluetoothData=BT.read();
    if(BluetoothData=='1')
    {   
      // if number 1 pressed ....
      digitalWrite(ledpin,1);
      BT.println("LED  On D13 ON ! ");
    }
    if (BluetoothData=='0')
    {
      // if number 0 pressed ....
      digitalWrite(ledpin,0);
      BT.println("LED  On D13 Off ! ");
    }
  }
delay(100);// prepare for next data ...
}

[/codesyntax]

PC setup

I use software called TeraTerm to show the data received or what we want to send through it . You can download TeraTerm or any terminal emulator software , you can download Tera term from this link : http://hp.vector.co.jp/authors/VA002416/ttermv14.zip

To make a link between your Arduino and PC:

I’m using Windows 10 here

1) Go to the Bluetooth icon , right click and select Add a Bluetooth Device

2) Our bluetooth module will appear as HC-06 , select it and click on the Pair button