Blinking LED

Description:

Use the Arduino to control a light emitting diode and make it blink.

Components Used:

Light Emitting Diode (LED)
Resistor

Code:

/* Blinking LED
* ------------
*
* turns on and off a light emitting diode(LED) connected to a digital  
* pin, in intervals of 2 seconds. Ideally we use pin 13 on the Arduino 
* board because it has a resistor attached to it, needing only an LED
*
* Created 1 June 2005
* copyleft 2005 DojoDave <http://www.0j0.org>
* http://arduino.berlios.de
*
* based on an orginal by H. Barragan for the Wiring i/o board
*/
int ledPin = 13;                 // LED connected to digital pin 13
void setup()
{
pinMode(ledPin, OUTPUT);      // sets the digital pin as output
}
void loop()
{
digitalWrite(ledPin, HIGH);   // sets the LED on
delay(1000);                  // waits for a second
digitalWrite(ledPin, LOW);    // sets the LED off
delay(1000);                  // waits for a second
}

Images: