Bluetooth Basics : Arduino interface with HC05

We can control any of your electronic devices with your smart phone, Even we can control a robot or any other special electronic equipment with our smart phone , Here is a simple tutorial for interfacing an Android Smartphone with Arduino via Bluetooth

Required Materials

Hardware

1. Bluetooth Module HC 05/06
2. Arduino & Battery (with cable)
3. LED
4. 220Ω Resistor
5. Android device

Software

1. Arduino IDE
2. Bluetooth electronics

Connecting the Arduino Bluetooth hardware

Arduino Code

char data = 0;                                      //Variable for storing received data

void setup() 

{

  Serial.begin(9600);                         //Sets the data rate in bits per second (baud) for serial data transmission

  pinMode(13, OUTPUT);                 //Sets digital pin 13 as output pin

}

void loop()

{

      if(Serial.available())                     // Check if data available in serial port

      {

            data = Serial.read();               //Read the incoming data and store it into variable data

            if(data == 'a')                         //Checks whether value of data is equal to 1

            { 

              digitalWrite(13, HIGH);      //If value is 1 then LED turns ON

            }

            else if(data == 'b')                   //Checks whether value of data is equal to 0

            {

              digitalWrite(13, LOW);        //If value is 0 then LED turns OFF

            }

      }                            

}

Download Arduino code From here