#include <LiquidCrystal.h>

/*
  EEL-5666 Example 1: Use of Digital Output Pins. Turn on/off external
  LEDs connected to Pins 11 & 12 alternatively & the internal LED 
  on Pin 13 on/off. Add a delay in each state of 1 sec.   
  Arroyo January 11 2016  
 */

int extLED1 = 11;   // External LED connected to digital pin 11
int extLED2 = 12;   // External LED connected to digital pin 12
int intLED  = 13;   // Internal LED connected to digital pin 13

void setup( ) {
  pinMode(extLED1, OUTPUT);    // sets digital pin 12 as output
  pinMode(extLED2, OUTPUT);    // sets digital pin 12 as output
  pinMode(intLED,  OUTPUT);    // sets digital pin 13 as output
}

  int count=0;
void loop( ) {
  if (count < 1) {
    for (int j=0; j<8; j++){
      digitalWrite(13, HIGH);   // set the internal LED on
      digitalWrite(12, LOW);    // set the external LED1 off
      digitalWrite(11, HIGH);   // set the external LED2 on
      delay(500);               // wait for a 1/2 second
      digitalWrite(13, LOW);    // set the internal LED off
      digitalWrite(12, HIGH);   // set the external LED on
      digitalWrite(11, LOW);    // set the external LED off
      delay(500);               // wait for a 1/2 second
    }
  digitalWrite(13, HIGH);   // set the internal LED  on
  digitalWrite(12, HIGH);   // set the external LED1 on
  digitalWrite(11, HIGH);   // set the external LED2 on
  }
  count=1;
}