/*Creating an animation:
repeat until all the leds in the grid have been turned on
1. Turn everything off, 
2. turn on the specific led
--
change frame
*/

int a1=2;
int a2=3;
int a3=4;
int a4=5;
int c1=6;
int c2=7;
int c3=8;
int c4=9;

int frame = 1;
long timer;
long timeOut = 1000;      //1 second


void setup()
{
  for (int i=2; i<=9;i++)
  {
    pinMode(i,OUTPUT);
  }
  Serial.begin(9600);
  Serial.println("STARTED");
  timer=millis();
}



void loop()
{
  if (millis()-timer >= timeOut) {
   //proceed with the next frame
   frame++;
   if (frame>4) {
     frame = 1; 
   }
   timer = millis();
  }

  if (frame == 1) {
    //play frame 1
    playFrame1();    
  } else if (frame == 2) {
    //play frame 2
    
  } else if (frame == 3) {
    //play frame 3
    
  } else if (frame == 4) {
  
  }
}

void playFrame1()
{
  off();
  //top left will be c1, a1
  digitalWrite(a1,HIGH);
  digitalWrite(c1,LOW);
  off();
  //bottom right will be c1, a1
  digitalWrite(a4,HIGH);
  digitalWrite(c4,LOW);
}

void off()
{
  for (int i=0;i<4;i++)
  {  
    digitalWrite(i+2,LOW);
    digitalWrite(i+6,HIGH);
  }
}