011 Blink2 Sketch

This sketch shows the on-board LED and a breadboarded LED going on and off alternately. I copied it straight from Peter's blog:

/*
Blink2
Turns on a LED on for half a second, then off for half a second, repeatedly. It also does the same to an off-board LED connected to pin 12 so that when one LED is on the other is off.
The circuit:
* LED connected from digital pin 13 to ground via resistor.
* second LED connected from digital pin 12 to ground via resistor. I used 330 ohms.
* Note: On most Arduino boards, there is already an LED on the board
connected to pin 13.
Created 1 June 2005
By David Cuartielles. Adapted by Peter Brook


based on an orginal by H. Barragan for the Wiring i/o board
*/


int ledPin = 13; // LED connected to digital pin 13
int redLedPin = 12; // LED connected to digital pin 13
int del =500;


// The setup() method runs once, when the sketch starts


void setup()
{ 
  // initialize the digital pin as an output:
  pinMode(ledPin, OUTPUT); 
  pinMode(redLedPin, OUTPUT); 
}


// the loop() method runs over and over again,
// as long as the Arduino has power


void loop() 
{
  digitalWrite(ledPin, HIGH); // set the LED on
  digitalWrite(redLedPin, LOW); // set the LED on
  delay(del); // wait for a second
  digitalWrite(ledPin, LOW); // set the LED off
  digitalWrite(redLedPin, HIGH); // set the LED off
  delay(del); // wait for a second
}

Here is a picture:

...

and a video clip:

...

of it working. Thanks to my mate Roy for helping me set up the circuit (my first ever breadboard!) and for taking and getting me the clips.