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project 15 :LED Controller

1. LED Controller

 *  Bluetooh Basic: LED ON OFF - Avishkar
 *  Coder - Mayoogh Girish
 *  Website - http://bit.do/Avishkar
 *  Download the App : 
 *  This program lets you to control a LED on pin 13 of arduino using a bluetooth module
char Incoming_value = 0;                //Variable for storing Incoming_value
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)  
    Incoming_value = Serial.read();      //Read the incoming data and store it into variable Incoming_value
    Serial.print(Incoming_value);        //Print Value of Incoming_value in Serial monitor
    Serial.print("\n");        //New line 
    if(Incoming_value == '1')            //Checks whether value of Incoming_value is equal to 1 
      digitalWrite(13, HIGH);  //If value is 1 then LED turns ON
    else if(Incoming_value == '0')       //Checks whether value of Incoming_value is equal to 0
      digitalWrite(13, LOW);   //If value is 0 then LED turns OFF

Before the build check out my blog for more similar tutorials

Link to my link

Let’s Start Building
The circuit is so simple and small, there are only a few connections to be made
Arduino Pins           Bluetooth Pins
RX (Pin 0)     ———->      TX

TX (Pin 1)      ———->      RX
5V                ———->      VCC
GND             ———->      GND
Connect a LED negative to GND of Arduino and positive to pin 13 with a resistance valued between 220Ω – 1KΩ. And you're done with the circuit