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Arduino and HC-06 bluetooth example

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

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

arduino and hc05

 

Code

Upload the following to your Arduino

#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 ...
}

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

bluetooth1

bluetooth1

3) The pairing code is 1234 . On Windows 10 you will see something like this. Click on next and your ready to go

bluetooth2

bluetooth2

Now start Tera Term and you will see a bluetooth com port, as you can see in this example on my PC it was COM4

Tera Term New connection

Tera Term New connection

In the terminal send a 0 and 1 and you should see something like this

Tera Term VT

Tera Term VT

 

Links

Here are links to the HC-05 and HC-06 modules
Bluetooth Module 3.6V-6V HC-06 FZ0405 Free Shipping

HC-05 Wireless Bluetooth RF Transceiver Module

 

Originally my Windows 10 had no bluetooth capabilities but I added the small module below and this was then present

AliExpress.com Product – Del Mini USB Bluetooth V4.0 Dongle Dual Mode Wireless Adapter For Laptop PC Feb26

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