int latchPin = 9; 
int clockPin = 8;
int dataPin = 10;
int irRead2 = 5; //PA5 Photodiode 3
int counter = 0;

void setup() {
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
//pinMode(irRead1, INPUT);
pinMode(irRead2, INPUT);
//pinMode(irRead3, INPUT);
//pinMode(irRead4, INPUT);
}

void loop() {

baseLine();

  for (int i=0;i<10;i++) {
int analogValue2 = analogRead(irRead2);
if (analogValue2 > 100) {
  counter ++;
  delay(100);
}
  }

if (counter > 4) {
  lightLeft();
}

if ((counter > 0) && (counter < 4)){
  lightRight();
}


counter = 0;
}

void lightRight() {
   for (int i=0; i<3; i++) {
  
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, LSBFIRST, 16);
  shiftOut(dataPin, clockPin, LSBFIRST, 252);
  digitalWrite(latchPin, HIGH);
  delay(1000);

  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, LSBFIRST, 0);
  shiftOut(dataPin, clockPin, LSBFIRST, 0);
  digitalWrite(latchPin, HIGH);
  delay(1000);
  }
}

void lightLeft() {
   for (int i=0; i<3; i++) {
  
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, LSBFIRST, 0);
  shiftOut(dataPin, clockPin, LSBFIRST, 254);
  digitalWrite(latchPin, HIGH);
  delay(1000);

  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, LSBFIRST, 0);
  shiftOut(dataPin, clockPin, LSBFIRST, 0);
  digitalWrite(latchPin, HIGH);
  delay(1000);
  }
}

void baseLine(){
digitalWrite(latchPin, LOW);
shiftOut(dataPin, clockPin, LSBFIRST, 0); // Shiftregister IC3
shiftOut(dataPin, clockPin, LSBFIRST, 0); // Shiftregister IC1
digitalWrite(latchPin, HIGH);

delay(100); 
}