How to Blink an led with Arduino

Material you would need -

1. a LED

2. Arduino

3. Arduino IDE (to program Arduino) 

    download it from here -Arduino IDE

Step 1 - 

Upload the program written below in Arduino with Arduino IDE.

        

// Pin 13 has an LED connected on most Arduino boards.

// give it a name:

int led = 13;

// the setup routine runs once when you press reset

void setup()

{               

// initialize the digital pin as an output.

pinMode(led, OUTPUT);    

}

// the loop routine runs over and over again forever:

void loop()

{

digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)

delay(1000);                      // wait for a second

digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW

delay(1000);               // wait for a second

}

Step 2 - 

After uploading disconnect your arduino from usb port and 

connect positive of  led to a terminal of resistor and connect

second terminal of resistor to pin 13 and ground to ground                   

pin on arduino. 

             

                                                 circuit is illustrated below.

Step 3 - 

Now check your circuit and connect your arduino to usb port of pc. if you did everything correct your arduino would blink for a second and after a second it would  be off  for 1 second this would continue because we added a loop. now try to control more than one led by yourself.