Diwali Lights

/*
 * Author: ***** *** <rohroexperiment@gmail.com>
 * File: diwali_lights.ino
 * Description: Diwali lights
*/
/*
 * Pin connections:
   * 74HC595
      * Pins 1-7 -> LED(of your choice)
      * Pin 8 -> GND
      * Pin 9 -> N/C
      * Pin 10 -> VCC
      * Pin 11 -> Arduino pin 3
      * Pin 12 -> Arduino pin 4
      * Pin 13 -> GND
      * Pin 14 -> Arduino pin 5
      * Pin 15 -> LED(of your choice)
      * Pin 16 -> VCC
   * Other:
    * Push button
      * One side to arduino pin 2 
      * Other side to GND
*/
#define MAXANIMATIONS 6
int data = 5;
int clock = 3;
int latch = 4;
int brightness = 200;
int animation = 1;
//Used for single LED manipulation
int ledState = 0;
const int ON = HIGH;
const int OFF = LOW;
byte pattern[] =
{
  B00000001,
  B00000010,
  B00000100,
  B00001000,
  B00010000,
  B00100000,
  B01000000,
  B10000000,
  B01000000,
  B00100000,
  B00010000,
  B00001000,
  B00000100,
  B00000010
};
byte pattern2[] { 129, 66, 36, 24, 36, 66};
byte pattern3[] {B10000000, B00100000, B00001000, B00000010, B00000001, B00000100, B00010000, B01000000};
void setup()
{
  pinMode(2, INPUT_PULLUP);
  attachInterrupt(0, nextAnimation, FALLING);
  pinMode(data, OUTPUT);
  pinMode(clock, OUTPUT);
  pinMode(latch, OUTPUT);
  Serial.begin(9600);

}
void nextAnimation () {
  if (digitalRead(2) == LOW) {
    delayMicroseconds(10000);
    if (digitalRead(2) == LOW) {
      if (animation == MAXANIMATIONS) animation = 1;
      else animation++;
    }
    while (digitalRead(2) == LOW);
  }
}
/*
   loop() - this function will start after setup finishes and then repeat
   we set which LEDs we want on then call a routine which sends the states to the 74HC595
*/
void loop()                     // run over and over again
{



  if (animation == 1) animation1();
  else if (animation == 2) animation2();
  else if (animation == 3) animation3();
  else if (animation == 4) animation4();
  else if (animation == 5) animation5();
  else if (animation == 6) animation6();
}
void animation1 () {

  updateLEDs(0x55);
  delay(1000);
  updateLEDs(B10101010);
  delay(1000);

}
void animation2 () {

  for (int i = 0; i < sizeof(pattern); i++) {
    updateLEDs(pattern[i]);
    delay(250);

  }
}
void animation3() {

  randomSeed(analogRead(A1));
  updateLEDs(random(255));
  delay(1000);

}
void animation4() {
  updateLEDs(0xff);
  delay(100);
  updateLEDs(0);
  delay(100);
}
void animation5() {
  for (int i = 0; i < sizeof(pattern2); i++) {
    updateLEDs(pattern2[i]);
    delay(250);
  }
}
void animation6() {
  for (int i = 0; i < sizeof(pattern3); i++) {
    updateLEDs(pattern3[i]);
    delay(250);
  }
}
/*
   updateLEDs() - sends the LED states set in ledStates to the 74HC595
   sequence
*/
void updateLEDs(int value) {
  //digitalWrite(latch, LOW);     //Pulls the chips latch low
  //shiftOut(data, clock, LSBFIRST, value); //Shifts out the 8 bits to the shift register
  //digitalWrite(latch, HIGH);   //Pulls the latch high displaying the data
  digitalWrite(latch, LOW);    //Pulls the chips latch low
  for (int i = 0; i < 8; i++) { //Will repeat 8 times (once for each bit)
    int bit = value & B10000000; //We use a "bitmask" to select only the eighth
    //bit in our number (the one we are addressing this time through
    value = value << 1;          //we move our number up one bit value so next time bit 7 will be
    //bit 8 and we will do our math on it
    if (bit == 128) {
      digitalWrite(data, HIGH); //if bit 8 is set then set our data pin high
    }
    else {
      digitalWrite(data, LOW);
    }
    //if bit 8 is unset then set the data pin low
    digitalWrite(clock, HIGH);                //the next three lines pulse the clock pin
    delay(1);
    digitalWrite(clock, LOW);
  }
  digitalWrite(latch, HIGH);
}