Getting two leds to flash.

/*

Blink2

Turns on an LED on for one second, then off for one second, repeatedly.

The circuit:

* LED connected from digital pin 13 to ground.

* Note: On most Arduino boards, there is already an LED on the board connected to pin 13, so you don't need any extra components for this example.

Created 1 June 2005

By David Cuartielles

http://arduino.cc/en/Tutorial/Blink

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 12

// 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(500); // wait for half a second

digitalWrite(ledPin, LOW); // set the LED off

digitalWrite(redLedPin, HIGH); // set the LED off

delay(500); // wait for another half second

}

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/*

Blink3

Turns on an LED on for one second, then off for one second, repeatedly.

The circuit:

* LED connected from digital pin 13 to ground.

* Note: On most Arduino boards, there is already an LED on the board

connected to pin 13, so you don't need any extra components for this example.

Created 1 June 2005

By David Cuartielles

http://arduino.cc/en/Tutorial/Blink

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 12

int del =500 ; //use this variable for any delays down below

// 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

}