how to connect arduino to android via bluetooth

you need-

arduino uno or other arduino board
HC-05/HC-06 bluetooth module
jumper wire
9v power or battery

Download mobile app ardudroid or any other app from paly store

send serial data 1  --glow led
send serial data 0  -- put off led

blutooth module HC-05 password 1234

connection

vcc to 5v
GND to GND
RX to TX
TX  to RX

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() > 0)  // Send data only when you receive data:
  {
    data = Serial.read();      //Read the incoming data and store it into variable data
    Serial.print(data);        //Print Value inside data in Serial monitor
    Serial.print("\n");        //New line 
    if(data == '1')            //Checks whether value of data is equal to 1 
      digitalWrite(13, HIGH);  //If value is 1 then LED turns ON
    else if(data == '0')       //Checks whether value of data is equal to 0
      digitalWrite(13, LOW);   //If value is 0 then LED turns OFF
  }                            

}


upload this code to arduino