int SENSOR1=A0;
int SENSOR2=A1;
int SENSOR3=A2;
int YELLOW1=2;
int RED=3;
int YELLOW2=4;
int clearcount;

void trkclr(int valA0, int valA2);
void trkoccright(int valA0, int valA2);
void trkoccleft(int valA0, int valA2);
void trkocc(int valA0, int valA2);

void setup() {
  Serial.begin(9600);
  pinMode(YELLOW1, OUTPUT);
  pinMode(RED, OUTPUT);
  pinMode(YELLOW2, OUTPUT);
  pinMode(SENSOR1, INPUT);
  pinMode(SENSOR2, INPUT);
  pinMode(SENSOR3, INPUT);

}
enum TRACKSTATES
{
  TRKCLR,
  TRKOCC,
  TRKOCCRIGHT,
  TRKOCCLEFT,
};

TRACKSTATES trackState=TRKCLR;

void loop() {
  int valA0=analogRead(SENSOR1);
  int valA1=analogRead(SENSOR2);
  int valA2=analogRead(SENSOR3);
  Serial.println(valA0);
  Serial.println(valA1);
  Serial.println(valA2);
  delay(200);

  switch(trackState)
  {
    case TRKCLR:
    trkclr(valA0, valA1, valA2);
    break;
    case TRKOCC:
    trkocc(valA0, valA1, valA2);
    break;
    case TRKOCCRIGHT:
    trkoccright(valA0, valA2);
    break;
    case TRKOCCLEFT:
    trkoccleft(valA0, valA2);
    break;
  }
}

void trkclr(int valA0, int valA1, int valA2){
  digitalWrite(YELLOW1, LOW);
  digitalWrite(RED, LOW);
  digitalWrite(YELLOW2, LOW);
  delay(500);
  clearcount=0;

  if (valA0>500 && valA2<500){
    trackState=TRKOCCRIGHT;
  }
  if (valA0<500 && valA2>500){
    trackState=TRKOCCLEFT;
  }
  if (valA0<500 && valA1<500 && valA2<500){
    trackState=TRKOCC;
  }
  if (valA0>500 && valA1>500 && valA2>500){
    trackState=TRKCLR;
  }
}

void trkoccright(int valA0, int valA2){
    digitalWrite(YELLOW1, HIGH);
    digitalWrite(RED, HIGH);
    digitalWrite(YELLOW2, LOW);
    delay(500);
}

void trkoccleft(int valA0, int valA2){
  digitalWrite(YELLOW1, LOW);
  digitalWrite(RED, HIGH);
  digitalWrite(YELLOW2, HIGH);
  delay(500);
}

void trkocc(int valA0, int valA1, int valA2){
  digitalWrite(YELLOW1, LOW);
  digitalWrite(RED, HIGH);
  digitalWrite(YELLOW2, LOW);
  delay(500);
}