#define t   30
#define t1  20
#define t2  100
#define t3  50
#define t4  250
#define t5  1

void setup() {
  // set up pins 2 to 8 as outputs
  for (int i = 2; i <= 8; i++) {
    pinMode(i, OUTPUT);
    pinMode(18, OUTPUT);
    pinMode(19, OUTPUT);
    digitalWrite(18, HIGH);
    digitalWrite(19, HIGH);
  
  }
}



void loop(){

//chase back and forth
    effect_1();
    effect_1();

//outside in
    effect_2();
    effect_2();

//cylon visor
    effect_3();
    effect_3();
 
//evens one way odds the other (meh)
    effect_4();
    effect_4();

//fill low to high
    effect_5();
    effect_5();

//peak meter
    effect_6();
    effect_6();
  }

//Effect 1
void effect_1()
{
for(int i=2; i<8; i++){
digitalWrite(i, HIGH);
delay(t1);
digitalWrite(i+1, HIGH);
delay(t1);
digitalWrite(i+2, HIGH);
delay(t1);
digitalWrite(i, LOW);
delay(t1);
digitalWrite(i+1, LOW);
delay(t1);
}
for(int i=8; i>1; i--){
digitalWrite(i, HIGH);
delay(t1);
digitalWrite(i-1, HIGH);
delay(t1);
digitalWrite(i-2, HIGH);
delay(t1);
digitalWrite(i, LOW);
delay(t1);
digitalWrite(i-1, LOW);
delay(t1);
}
}
//Effect 2
void effect_2()
{
int count = 8; // keeps track of second LED movement

  // move first LED from left to right and second from right to left
  for (int i = 2; i < 9; i++) {
    clear();
    digitalWrite(i, HIGH);      // chaser 1
    digitalWrite(count, HIGH); // chaser 2
    count--;
    // stop LEDs from appearing to stand still in the middle
    if (count != 7) {
      delay(t2);
    }
  }

  // move first LED from right to left and second LED from left to right
  for (int i = 9; i > 2; i--) {
    clear();
    digitalWrite(i, HIGH);      // chaser 1
    digitalWrite(count, HIGH); // chaser 2
    count++;
    // stop LEDs from appearing to stand still in the middle
    if (count != 7) {
      delay(t2);
    }
  }
}

//Effect 3

void effect_3()
{
for(int i=2; i<9; i++){
  digitalWrite(i, HIGH);
  delay(t3);
}
for(int i=2; i<9; i++){
  digitalWrite(i, LOW);
  delay(t3);
}


for(int i = 9; i>=2; i--){
  digitalWrite(i, HIGH);
  delay(t3);
}
for(int i = 9; i>=2; i--){
  digitalWrite(i, LOW);
  delay(t3);
}
}
  //Effect 4
void effect_4()
{
for(int j = 2; j <= 8; j++){
  digitalWrite(j, HIGH);
  delay(t2);
  j=j+1;
  }
for(int j = 2; j <= 8; j++){
  digitalWrite(j, LOW);
  delay(t2);
  }

  for(int k = 15; k > 1; k--){
  digitalWrite(k, HIGH);
  delay(t2);
  k=k-1;
  }
for(int k = 15; k > 1; k--){
  digitalWrite(k, LOW);
  delay(t2);
  }
}


//Effect 5
  void effect_5()
{
 for(int pin = 8; pin >= 2; pin--)
  {
  digitalWrite(pin, HIGH);
  delay(t1);
  digitalWrite(pin+1, LOW);
  delay(t1);
  }
  for(int pin = 8; pin >= 2; pin--)
  {
  digitalWrite(pin+1, HIGH);
  delay(t1);
  digitalWrite(pin+2, LOW);
  delay(t1);
  }
  for(int pin = 8; pin >= 2; pin--)
  {
  digitalWrite(pin+2, HIGH);
  delay(t1);
  digitalWrite(pin+3, LOW);
  delay(t1);
  }
  for(int pin = 8; pin >= 2; pin--)
  {
  digitalWrite(pin+3, HIGH);
  delay(t1);
  digitalWrite(pin+4, LOW);
  delay(t1);
  }
    for(int pin = 8; pin >= 2; pin--)
  {
  digitalWrite(pin+4, HIGH);
  delay(t1);
  digitalWrite(pin+5, LOW);
  delay(t1);
  }
  for(int pin = 8; pin >= 2; pin--)
  {
  digitalWrite(pin+5, HIGH);
  delay(t1);
  digitalWrite(pin+6, LOW);
  delay(t1);
  }
  for(int pin = 8; pin >= 2; pin--)
  {
  digitalWrite(pin+6, HIGH);
  delay(t1);
  digitalWrite(pin+7, LOW);
  delay(t1);
  }
   for(int pin = 8; pin >= 2; pin--)
  {
  digitalWrite(pin+7, HIGH);
  delay(t1);
  digitalWrite(pin+8, LOW);
  delay(t1);
  }
  for(int pin = 8; pin >= 2; pin--)
  {
  digitalWrite(pin+8, HIGH);
  delay(t1);
  digitalWrite(pin+9, LOW);
  delay(t1);
  }
  
  for(int pin = 8; pin >= 2; pin--)
  {
    digitalWrite(pin, LOW);
  delay(t5);
    }
  }
 

//Effect 6
void effect_6()
{
for(int j=2; j<9; j++){
  digitalWrite(j, HIGH);
  delay(t2);
  digitalWrite(j+2, LOW);
  delay(t1);
}
for(int k = 8; k>=1; k--){
  digitalWrite(k, HIGH);
  delay(t2);
  digitalWrite(k+2, LOW);
  delay(t1);
}
}

// function to switch all LEDs off
void clear(void)
{
  for (int i = 2; i <= 13; i++) {
    digitalWrite(i, LOW);
  }
}