int latchPin = 10;
int clockPin = 12;
int dataPin = 11;
int butPin = 13;
int mode = 4;
char inputString[2];
int delayConst = 250;


void setup() {
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(butPin, INPUT_PULLUP);
  Serial.begin(9600);
  shiftOut(dataPin, clockPin, MSBFIRST, 0b00000000);
  shiftOut(dataPin, clockPin, MSBFIRST, 0b00000000);
  shiftOut(dataPin, clockPin, MSBFIRST, 0b00000000);
  digitalWrite(latchPin, HIGH);
  delay(2000);
}

void loop() {
  if (mode == 0) {
    	shiftOut(dataPin, clockPin, MSBFIRST, 0b11111111);
      shiftOut(dataPin, clockPin, MSBFIRST, 0b11111111);
      shiftOut(dataPin, clockPin, MSBFIRST, 0b11111111);
      digitalWrite(latchPin, HIGH);
  }
  if (mode == 1) {
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, LSBFIRST, 0b01010101);
      shiftOut(dataPin, clockPin, LSBFIRST, 0b01010101);
      shiftOut(dataPin, clockPin, LSBFIRST, 0b01010101);
      digitalWrite(latchPin, HIGH);
      delay(delayConst);
      digitalWrite(latchPin, LOW);
      shiftOut(dataPin, clockPin, LSBFIRST, 0b10101010);
      shiftOut(dataPin, clockPin, LSBFIRST, 0b10101010);
      shiftOut(dataPin, clockPin, LSBFIRST, 0b10101010);
      digitalWrite(latchPin, HIGH);
      delay(delayConst);
  }
  if (mode == 2) {
    int byteToSend = 0;
    for (int i = 0; i < 24; i++) {
      if (i < 4) {
        byteToSend = 0;
        bitWrite(byteToSend, i, HIGH);
        digitalWrite(latchPin, LOW);
        shiftOut(dataPin, clockPin, LSBFIRST, byteToSend);
        shiftOut(dataPin, clockPin, LSBFIRST, 0b00000000);
        shiftOut(dataPin, clockPin, LSBFIRST, 0b00000000);
        digitalWrite(latchPin, HIGH);
      }
      if ((i < 8) && (i > 3)) {
        byteToSend = 0;
        bitWrite(byteToSend, i, HIGH);
        digitalWrite(latchPin, LOW);
        shiftOut(dataPin, clockPin, LSBFIRST, byteToSend);
        shiftOut(dataPin, clockPin, LSBFIRST, 0b00000000);
        shiftOut(dataPin, clockPin, LSBFIRST, 0b00000000);
        digitalWrite(latchPin, HIGH);
        delay(delayConst/3);
      }
      if ((i < 16) && (i > 7)) {
        byteToSend = 0;
        bitWrite(byteToSend, i-8, HIGH);
        digitalWrite(latchPin, LOW);
        shiftOut(dataPin, clockPin, LSBFIRST, 0b00000000);
        shiftOut(dataPin, clockPin, LSBFIRST, byteToSend);
        shiftOut(dataPin, clockPin, LSBFIRST, 0b00000000);
        digitalWrite(latchPin, HIGH);
        delay(delayConst/3);
      }
      if ((i < 24) && (i > 15)) {
        byteToSend = 0;
        bitWrite(byteToSend, i-16, HIGH);
        digitalWrite(latchPin, LOW);
        shiftOut(dataPin, clockPin, LSBFIRST, 0b00000000);
        shiftOut(dataPin, clockPin, LSBFIRST, 0b00000000);
        shiftOut(dataPin, clockPin, LSBFIRST, byteToSend);
        digitalWrite(latchPin, HIGH);
        delay(delayConst/3);
      }
    }
  }
  if (mode == 3) {
    int byteToSend = 0;
    for (int i = 0; i < 24; i++) {
      if (i < 8) {
        byteToSend = 0;
        bitWrite(byteToSend, i, HIGH);
        digitalWrite(latchPin, LOW);
        shiftOut(dataPin, clockPin, MSBFIRST, 0b00000000);
        shiftOut(dataPin, clockPin, MSBFIRST, 0b00000000);
        shiftOut(dataPin, clockPin, MSBFIRST, byteToSend);
        digitalWrite(latchPin, HIGH);
        delay(delayConst/3);
      }
      if ((i < 16) && (i > 7)) {
        byteToSend = 0;
        bitWrite(byteToSend, i-8, HIGH);
        digitalWrite(latchPin, LOW);
        shiftOut(dataPin, clockPin, MSBFIRST, 0b00000000);
        shiftOut(dataPin, clockPin, MSBFIRST, byteToSend);
        shiftOut(dataPin, clockPin, MSBFIRST, 0b00000000);
        digitalWrite(latchPin, HIGH);
        delay(delayConst/3);
      }
      if ((i < 20) && (i > 15)) {
        byteToSend = 0;
        bitWrite(byteToSend, i-16, HIGH);
        digitalWrite(latchPin, LOW);
        shiftOut(dataPin, clockPin, MSBFIRST, byteToSend);
        shiftOut(dataPin, clockPin, MSBFIRST, 0b00000000);
        shiftOut(dataPin, clockPin, MSBFIRST, 0b00000000);
        digitalWrite(latchPin, HIGH);
        delay(delayConst/3);
      }
    }
  }
  if (mode == 4) {
    int byteToSend_1 = 0;
    int byteToSend_2 = 0;
    int byteToSend_3 = 0;
    int randState = 0;
    for (int i = 0; i < 24; i++){
      if (i < 8) {
        randState = random (0, 2);
        bitWrite(byteToSend_1, i, randState);
      }
      if ((i < 16) && (i > 7)) {
        randState = random (0, 2);
        bitWrite(byteToSend_2, i-8, randState);
      }
      if ((i < 24) && (i > 15)) {
        randState = random (0, 2);
        bitWrite(byteToSend_3, i-16, randState);
      }
    }
    digitalWrite(latchPin, LOW);
    delay(delayConst);
    shiftOut(dataPin, clockPin, MSBFIRST, byteToSend_1);
    shiftOut(dataPin, clockPin, MSBFIRST, byteToSend_2);
    shiftOut(dataPin, clockPin, MSBFIRST, byteToSend_3);
    digitalWrite(latchPin, HIGH);
    delay(delayConst);
  }
}