Project 4: Multiple LED's

Project 4 –Multiple LED’s -  8 lights at a time!

Programming concepts we learned were:

• ·         Managing lots of variables with arrays.
• ·         Random number generation

Our 3 programs:

1. 1.    Light all 8 LED’s one by one
2. 2.    Have the lights “chase”each other like on a marquee
3. 3.    Light up a random light

int ledPins[] = {2,3,4,5,6,7,8,9};

void setup()

{  int index;

    for(index = 0; index <= 7; index++)

  {    pinMode(ledPins[index],OUTPUT); }}

void loop()

{  oneAfterAnotherLoop() 

  chasing();            

  randomLED();         }

void oneAfterAnotherLoop()

{  int index;

  int delayTime = 100;

  for(index = 0; index <= 7; index++)

  {    digitalWrite(ledPins[index], HIGH);

    delay(delayTime)    

  }                                 

  for(index = 7; index >= 0; index--)

  {    digitalWrite(ledPins[index], LOW);

    delay(delayTime);}            

}

void chasing()

{  int index;

  int delayTime = 200;                  

  for(index = 0; index <= 3; index++)   {

    digitalWrite(ledPins[index], HIGH);   

    digitalWrite(ledPins[index+4], HIGH); 

    delay(delayTime);                     

    digitalWrite(ledPins[index], LOW);   

    digitalWrite(ledPins[index+4], LOW);    }}

void randomLED()

{  int index;

  int delayTime;

    index = random(8);       

  delayTime = 100;

            digitalWrite(ledPins[index], HIGH); 

  delay(delayTime);                   

  digitalWrite(ledPins[index], LOW);  

}