LED

Switch ON LED

/*
 * http://arduspot.blogspot.in/p/led_12.html
 *
 * LED '+'ve → Ard 2
 */

int led = 2;

void setup() 

{

  pinMode(led,OUTPUT);

}

void loop() 

{

  digitalWrite(led,HIGH);

}

LED Blink

/*
 * http://arduspot.blogspot.in/p/led_12.html
 *
 * LED '+'ve → Ard 2
 */

int led = 2;
void setup()
{
  pinMode(led,OUTPUT);
}

void loop()
{
  digitalWrite(led,HIGH);
  delay(1000);
  digitalWrite(led,LOW);
  delay(1000);
}