void setup (){
  for (int i=0; i < 12 ; i++){
    pinMode (i, OUTPUT);
  }  
}

void loop (){ 
  
  chaseLR();
  chaseRL();
  center_out();
  odd_even ();
  
  }
  
 
    
void chaseLR (){
  /*This function does a Left to Right Chaser sequence
    adjust the itme_delay vatiable for longer or shorter delays*/
  int time_delay = 100;
  for (int i=0; i < 12; i++){
    digitalWrite(i,HIGH);
    delay(time_delay);
    digitalWrite(i,LOW);
  }
}

void chaseRL (){
    /*This function does a Right to Left Chaser sequence
    adjust the itme_delay vatiable for longer or shorter delays*/
  int time_delay = 100;
  for (int i=11; i >= 0; i--){
    digitalWrite(i,HIGH);
    delay(time_delay);
    digitalWrite(i,LOW);
  }
}

void center_out (){
  /*This function lights the lights starting at the center and going in both directions
    adjust the itme_delay vatiable for longer or shorter delays*/
  int time_delay = 100;
    for ( int x= 0; x < 7; x++){
      int i = 6 + x;
      int y = 6 -x;
      digitalWrite(y,HIGH);
      digitalWrite(i,HIGH);
      delay(time_delay);
      digitalWrite(y,LOW);
      digitalWrite(i,LOW);
  }
}
void odd_even (){
  /*Alternates between the odd and even LEDS */
  int time_delay = 500;
  int count = 10;
  for (int x = 0; x< 12; x++){
    digitalWrite(x,LOW);
  }
  for (int i = 0; i < count; i++){
    for (int x = 0; x< 12; x++){
    digitalWrite(x,LOW);
  }
    for (int y = 0; y <12; y+=2){
      digitalWrite(y,HIGH);
    }
    delay(time_delay);
    for (int x = 0; x<12; x++){
      digitalWrite(x,LOW);
    }
    for (int y = 1; y <12; y+=2){
      digitalWrite(y,HIGH);
    }
    delay(time_delay);
  }
}