Arduino AND Bluetooth HC-05 Connecting Easily

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Maker, PCB designer , electronics instructor from Jordan just one word ! I Adore electronics fo...


Hello Every body , This is my first artical on Instructable.com , I'm so happy for that , and I will start by How to connect arduino with bluetooth , I suffered a lot of problems when I try to connect it as the website and instructable artical did , So i decided To share my experience with You

The bluetooth module I will use today is HC-05 which is so familiar and cheap ,

Most tutorial on The website Connect the bluetooth with default Rx and Tx on the arduino Board , I faced a lot of problem and bluetooth didn't work will .

But arduino  support something Called Software Serial , which allow You to change any arduino board pin to serial pin 

http://arduino.cc/en/Reference/SoftwareSerial

so After reading this article you will be able to:

1) Connect arduino Board with PC By Bluetooth , to send and receive data .
2)Connect arduino Board with Any android device .


so you can send your information , Like Sensors reading , from arduino to PC Or android device , and you can build your Home automation system by bluetooth , and controlling your robot wirelessly


 

Step 1: Material and Connection

you need to do this experiment :

1) Arduino Board " I used Arduino Uno ".
2) Bluetooth module HC-05.
3)Solderless jumper.
4)Bread Board .
5)Battery 9V "Optional".

The connction between  Arduino and bluetooth is like the schematic above 





Step 2: Connect Arduino With PC

We now want to send or receive Data between arduino and computer , first we need to make a Communication link to Definition arduino Board to the computer .

We will need a software called Tera Term to show the data received or what we want to send through it .

You can download Tera Term 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 bluetooth , do the following :

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

2) Search for new device , Our bluetooth module will appear as HC-05 , and add it 

3) The pairing code will be 1234 .

4)after make a pairing , we can now program the arduino and upload a sketch  to send or receive data from Computer.

 

Step 3: Arduino Code

As I mentioned before , I will use software serial library to make pin D10 & D11 As Tx & Rx instead of using the default Rx and tx " D0 &D1 On most arduino Board " .

this program below allow us to control LED connected to D13 To blink on/off , by press # 1 from PC Keyboard the LED blink on , and if we press 0 LED blink off ! 

To send the Control commands from Computer to arduino , Go to the tera term , Run it , and choose Serial , and select the bluetooth Serial from the list as Shown on the picture .

The code below :

// This program shown how to control arduino from PC Via Bluetooth
// Connect ...
// arduino>>bluetooth
// D11   >>>  Rx
// D10   >>>  Tx
//Written By Mohannad Rawashdeh
//for http://www.genotronex.com/

// you will need arduino 1.0.1 or higher to run this sketch

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

SoftwareSerial Genotronex(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:
  Genotronex.begin(9600);
  Genotronex.println("Bluetooth On please press 1 or 0 blink LED ..");
  pinMode(ledpin,OUTPUT);
}

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

After uploading This sketch go to tera term and press 0 or 1 and see the results

This Video show the results of this code .

Step 4: Connect Arduino to Android Device

after we finished from connecting arduino with PC By bluetooth , let's move to how we can connect arduino To android device .

at first you need a terminal emulator on your andriod device to send or receive  data to arduino .

You can download this app from Google play .

https://play.google.com/store/apps/details?id=arduino.bluetooth.terminal&feature=search_result#?t=W251bGwsMSwxLDEsImFyZHVpbm8uYmx1ZXRvb3RoLnRlcm1pbmFsIl0.

after that , you can use the same arduino Sketch and control LED Blinking on or Off from android device .

just  type and t send #1 to make LED Blink on , or 0 to blink off .

this video below show how to control arduino I/O from android tablet .



Step 5: Receiving Data From Arduino

The last arduino Sketch that i wrote , used to send commands from PC Or android device  to android , Now in this program i will use arduino to Calculate the time since the start of the program in second , and send it Via bluetooth to any pairing device .

the code below 

// This program shown how to control arduino from PC Via Bluetooth
// Connect ...
// arduino>>bluetooth
// D11   >>>  Rx
// D10   >>>  Tx
//Written By Mohannad Rawashdeh
//for http://www.genotronex.com/

// you will need arduino 1.0.1 or higher to run this sketch

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

SoftwareSerial Genotronex(10, 11); // RX, TX
int ledpin=13; // led on D13 will show blink on / off
long previousMillis = 0;        // will store last time LED was updated

// the follow variables is a long because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long interval = 1000;           // interval at which to blink (milliseconds)
int ledState = LOW;             // ledState used to set the LED
long Counter=0; // counter will increase every 1 second
void setup() {
  // put your setup code here, to run once:
  Genotronex.begin(9600);
  Genotronex.println("Bluetooth On please wait....");
  pinMode(ledpin,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  unsigned long currentMillis = millis();

  if(currentMillis - previousMillis > interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;  
     Counter+=1;
  
    Genotronex.println(Counter);
  
    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW)
      ledState = HIGH;
    else
      ledState = LOW;

    // set the LED with the ledState of the variable:
    digitalWrite(ledpin, ledState);
  }
}

at the end , You can visit the orginal artical in arabic language on my website

http://www.genotronex.com/

Hope my first artical here is useful to you  , thank you for your time , 

10 People Made This Project!

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174 Discussions

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sunxing22

5 years ago on Introduction

well done , thanks for this tutorial
please do not forget to post this tutorial in your blog in Arabic :)

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chi239

24 days ago on Step 5

Hello Mr. Rawashdeh,

Like you, I too had a number of problems in controlling LEDs through Bluetooth from my Android phone. However, your design and sketch worked beautifully.

Thank you so much for posting.

May the blessings of Allah be on you.

Deepak Nair,
Chandigarh,
India.

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Mohannad RawashdehIlhamS17

Answer 3 months ago

what is your smartphone ? android version ? this is bluetooth 2.0 and some new android OS version doesn't support it .

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BhanuS31

Question 7 months ago on Step 5

Hello sir!

The tutorial was very helpful. Thankyou.

But i have some doubts.Actually im not able get the data on tera term window instead im getting 0 and ? symbols. what is the problem?

bluetooth.PNG
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DinaM46

Question 7 months ago

How many mode(HC-05) can connect to the cellphone similtanously ?

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fmalacoco

7 months ago on Step 5

This is very helpful. Thanks for you time to post this article in this website. this helps a lot for us. Thank you again.

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harkark

Question 7 months ago on Step 3

I try to compile code, but only error comes out.

Screenshot_20180328-182625.pngScreenshot_20180328-181842.png
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aidanadams2016

Question 8 months ago

The link on your website for the Arduino Bluetooth terminal doesn't work. Did you mean this program? https://play.google.com/store/apps/details?id=Qwer...

If this link doesn't work it is Bluetooth Terminal - Arduino on the Google Play Store. It is developed by QWERTY and it is E for Everyone. The email of the developer is aries156@gmail.com

If this isn't the same program could you tell me if the one described here is a good alternative or can you give me a link to the correct one?

Thank you for your time and I hope that I can get a response soon.

Google Play not working.PNG
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TrainorK

Question 9 months ago on Step 3

How can I make the LED turn on/off when I click with a mouse

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GauthamanM

11 months ago

in my moto g mobile able to send command 1 or 0 , but LED not glow, recever RX getting blink. what to do?

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GauthamanM

11 months ago

hai, on pc screen not able to entre any 1 or o

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GauthamanM

11 months ago

can u help me...

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GauthamanM

11 months ago

Hai, i have connected arduino with bluetooth and light also blinking,teraterm screen not able to type what to do

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JeremyR85

1 year ago

The HC05 used Bluetooth 2.0, while almost all mobiles understand only Bluetooth 4.0. Can the HC05 talk to a mobile with Bluetooth 4.0

Thanks for an answer,

Best wishes, Jerry

2 replies
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Mohannad RawashdehJeremyR85

Reply 1 year ago

Unfortunatley I didn't have now a new smartphone(still stick with my old S4) but even S4 with BLT 4.0 works fine with HC05 , HC06 as well

You can use newer Bluetooth module like CC2540/CC2541 , support 4.0 BLT and work with Iphone and android as well

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JeremyR85Mohannad Rawashdeh

Reply 1 year ago

Sorry for the delay. Thanks for telling me about the CC2540/CC2541 module. I'll try it out

Best wishes, Jerry

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VikiM4

1 year ago

simulate a push button using bluetooth from my phone on a music systemhi i want to simulate a push button using bluetooth from my phone on a music system what i want to achieve by doing this is when we power on the music system(by using WiFi enabled Sockets), by default it starts in aux mode by using mobile with bluetooth it changes it from aux to bluetooth mode so we can connect it with mobile and play music at scheduled time by using Tasker app
so we dont have to physically push any button
thanks
i use Zebronics ZEB-BT361RUCF Bluetooth 2.2 Ch. Multimedia Speaker System and i want to make change in this system