Fun with LEDs

/************************************
 *                                  *
 *        Arduino for Kids          *
 *         Fun with LEDs            *
 * www.youtube.com/learnelectronics *
 *       arduino0169@gmail.com      *
 *                                  *
 *          Hookup guide:           *
 *                                  *
 *  Pin 2 Led1   Red        1k      *
 *  Pin 3 Led2   Red        1k      *
 *  Pin 4 Led3   Green      1k      *
 *  Pin 5 Led4   Green      1k      *
 *  Pin 6 Led5   Yellow   470R      *
 *  Pin 7 Led6   Green      1k      *
 *  Pin 8 Led7   Green      1k      *
 *  Pin 9 Led8   Red        1k      *
 *  Pin10 Led9   Red        1k      *
 *                                  *
 ************************************
 */






int dly = 100;                        //delay variable, how long to wait between doing things (100=1/10sec)

void larsen(){                        //subroutine called larsen, like Knight Rider
  digitalWrite(2,LOW);                //set led to off
  digitalWrite(3,LOW);                //set led to off
  digitalWrite(4,LOW);                //set led to off
  digitalWrite(5,LOW);                //set led to off
  digitalWrite(6,LOW);                //set led to off
  digitalWrite(7,LOW);                //set led to off
  digitalWrite(8,LOW);                //set led to off
  digitalWrite(9,LOW);                //set led to off
  digitalWrite(10,LOW);               //all leds are initially off

  digitalWrite(2,HIGH);               //turn on led1
  delay(dly/2);                       //wait for 1/2 of our delay
  digitalWrite(2,LOW);                //turn led1 off
  delay(dly/2);                       //wait for 1/2 of our delay

   digitalWrite(3,HIGH);              //do the same with led2
  delay(dly/2);
  digitalWrite(3,LOW);
  delay(dly/2);

   digitalWrite(4,HIGH);              //do the same with led3
  delay(dly/2);
  digitalWrite(4,LOW);
  delay(dly/2);

   digitalWrite(5,HIGH);              //do the same with led4
  delay(dly/2);
  digitalWrite(5,LOW);
  delay(dly/2);

   digitalWrite(6,HIGH);              //do the same with led5
  delay(dly/2);
  digitalWrite(6,LOW);
  delay(dly/2);

   digitalWrite(7,HIGH);              //do the same with led6
  delay(dly/2);
  digitalWrite(7,LOW);
  delay(dly/2);

   digitalWrite(8,HIGH);              //do the same with led7
  delay(dly/2);
  digitalWrite(8,LOW);
  delay(dly/2);

   digitalWrite(9,HIGH);              //do the same with led8
  delay(dly/2);
  digitalWrite(9,LOW);
  delay(dly/2);

   digitalWrite(10,HIGH);             //do the same with led9
  delay(dly/2);
  digitalWrite(10,LOW);
  delay(dly/2);

  digitalWrite(9,HIGH);               //do the same with led10
  delay(dly/2);
  digitalWrite(9,LOW);
  delay(dly/2);

  digitalWrite(8,HIGH);               //now we go back down until we reach led1
  delay(dly/2);
  digitalWrite(8,LOW);
  delay(dly/2);

  digitalWrite(7,HIGH);
  delay(dly/2);
  digitalWrite(7,LOW);
  delay(dly/2);

  digitalWrite(6,HIGH);
  delay(dly/2);
  digitalWrite(6,LOW);
  delay(dly/2);

  digitalWrite(5,HIGH);
  delay(dly/2);
  digitalWrite(5,LOW);
  delay(dly/2);

  digitalWrite(4,HIGH);
  delay(dly/2);
  digitalWrite(4,LOW);
  delay(dly/2);

  digitalWrite(3,HIGH);
  delay(dly/2);
  digitalWrite(3,LOW);
  delay(dly/2);

}



void upndown(){                         //subroutine upndown (fades leds on and off)
  digitalWrite(2,LOW);                  //start with all leds off
  digitalWrite(3,LOW);
  digitalWrite(4,LOW);
  digitalWrite(5,LOW);
  digitalWrite(6,LOW);
  digitalWrite(7,LOW);
  digitalWrite(8,LOW);
  digitalWrite(9,LOW);
  digitalWrite(10,LOW);

  int x = 1;                            //keep track of if we are going up or down
   for (int i = 0; i > -1; i = i + x){  //count from 0 to 255
      analogWrite(5, i);                //set led brightness to the count
      analogWrite(6,i);                 // do the same with other led
      if (i == 255) x = -1;             // switch direction at peak
      delay(10);
   }

x = 1;
   for (int i = 0; i > -1; i = i + x){  //same as above just different leds
      analogWrite(10, i);
      analogWrite(9,i);
      if (i == 255) x = -1;
      delay(10);
   }

}




void ctrout(){                          //start at the center and move outward
  digitalWrite(6,HIGH);                 //center LED on
    delay(dly);                         //wait

  digitalWrite(7,HIGH);                 //turn on first pair
  digitalWrite(5,HIGH);
    delay(dly);                         //wait

  digitalWrite(8,HIGH);                 //turn on next outer pair
  digitalWrite(4,HIGH);
    delay(dly);                         //wait

  digitalWrite(9,HIGH);                 //turn on thrid pair
  digitalWrite(3,HIGH);
    delay(dly);                         //wait

  digitalWrite(10,HIGH);                //turn on outer pair
  digitalWrite(2,HIGH);
    delay(dly*6);                       //wait 6 times as long with all leds on

  digitalWrite(2,LOW);                  //turn all leds off
  digitalWrite(3,LOW);
  digitalWrite(4,LOW);
  digitalWrite(5,LOW);
  digitalWrite(6,LOW);
  digitalWrite(7,LOW);
  digitalWrite(8,LOW);
  digitalWrite(9,LOW);
  digitalWrite(10,LOW);
  delay(dly*8);                         //wait 8 times as long with all leds off
}

void outin() {                          //start from the outside and move in turning off each pair as the next lights

digitalWrite(10,HIGH);                  //outer pair on then off
digitalWrite(2,HIGH);
delay(dly);
digitalWrite(10,LOW);
digitalWrite(2,LOW);



digitalWrite(9,HIGH);                   //next inner pair on then off
digitalWrite(3,HIGH);
delay(dly);
digitalWrite(9,LOW);
digitalWrite(3,LOW);


digitalWrite(8,HIGH);                   //next inner pair on then off
digitalWrite(4,HIGH);
delay(dly);
digitalWrite(8,LOW);
digitalWrite(4,LOW);


digitalWrite(7,HIGH);                   //next inner pair on then off
digitalWrite(5,HIGH);
delay(dly);
digitalWrite(7,LOW);
digitalWrite(5,LOW);


digitalWrite(6,HIGH);                   //center led on then off
delay(dly);
digitalWrite(6,LOW);
delay(dly*8);                           //wait extra long at the end
}

void setup() {
                                        // put your setup code here, to run once:

  pinMode(2,OUTPUT);                    //set pin 2 for output
  pinMode(3,OUTPUT);                    //set pin 3 for output
  pinMode(4,OUTPUT);                    //set pin 4 for output
  pinMode(5,OUTPUT);                    //set pin 5 for output
  pinMode(6,OUTPUT);                    //set pin 6 for output
  pinMode(7,OUTPUT);                    //set pin 7 for output
  pinMode(8,OUTPUT);                    //set pin 8 for output
  pinMode(9,OUTPUT);                    //set pin 9 for output
  pinMode(10,OUTPUT);                   //set pin 10 for output
  digitalWrite(2,LOW);                  //start with all leds off
  digitalWrite(3,LOW);
  digitalWrite(4,LOW);
  digitalWrite(5,LOW);
  digitalWrite(6,LOW);
  digitalWrite(7,LOW);
  digitalWrite(8,LOW);
  digitalWrite(9,LOW);
  digitalWrite(10,LOW);

}

void loop() {
                                        // put your main code here, to run repeatedly:


 for (int i=0; i <= 2; i++){            //do what's inside the {} brackets 3 times
      ctrout();                         //call subroutine ctrout
      delay(10);                        //very small delay
   }

for (int i=0; i <= 2; i++){             //do what's inside the {} brackets 3 times
      outin();                          //call subroutine outin
      delay(10);
   }


for (int i=0; i <= 2; i++){             //do what's inside the {} brackets 3 times
      upndown();                        //call subroutine upndown
      delay(10);
   }


for (int i=0; i <= 2; i++){             //do what's inside the {} brackets 3 times
      larsen();                         //call subroutine larsen
      delay(10);
   }


                                        //end of the program

}