/*
 * Lesson 57: What is an array and "for" loop? | Arduino Step By Step Course
 * Turn ON and OFF 4 LEDs
 * Written by Ahmad Shamshiri for Robojax (Robojax.com)
 * on December 30, 2018 at 11:08 in Ajax, Ontario, Canada
 * watch full explanation: https://youtu.be/OgDZIP3VBK8
 
This code is available at http://robojax.com/course1/?vid=lecture67
 
with over 100 lectures free on YouTube. Watch it here: http://robojax.com/L/?id=338
Get the code for the course: http://robojax.com/L/?id=339  


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 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.
 * This code has been downloaded from Robojax.com
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
int led1 = 2;// pin defined for LED 1
int led2 = 3;// pin defined for LED 2
int led3 = 4;// pin defined for LED 3
int led4 = 5;// pin defined for LED 4

void setup() {
  pinMode(led1, OUTPUT);// Define a pin for LED 1
  pinMode(led2, OUTPUT);// Define a pin for LED 2
  pinMode(led3, OUTPUT);// Define a pin for LED 3
  pinMode(led4, OUTPUT);// Define a pin for LED 4   

  Serial.begin(9600);// initialize serial monitor

  digitalWrite(led1,LOW); // turn LED1 OFF
  digitalWrite(led2,LOW); // turn LED2 OFF
  digitalWrite(led3,LOW); // turn LED3 OFF
  digitalWrite(led4,LOW); // turn LED4 OFF  

}

void loop() {

  digitalWrite(led1,HIGH); // turn LED1 ON
  delay(1000);// wait for 1 second
  digitalWrite(led1,LOW); // turn LED1 OFF         
  delay(1000);// wait for 1 second

  digitalWrite(led2,HIGH); // turn LED2 ON
  delay(1000);// wait for 1 second
  digitalWrite(led2,LOW); // turn LED2 OFF         
  delay(1000);// wait for 1 second  

  digitalWrite(led3,HIGH); // turn LED3 ON
  delay(1000);// wait for 1 second
  digitalWrite(led3,LOW); // turn LED3 OFF         
  delay(1000);// wait for 1 second  

  digitalWrite(led4,HIGH); // turn LED4 ON
  delay(1000);// wait for 1 second
  digitalWrite(led4,LOW); // turn LED4 OFF         
  delay(1000);// wait for 1 second          

}