Another example for FireFighterFan to SearchFire.

SearchFire.ino

int DCMOTOR = 4;
int PWM_SPEED = 100;
int SPEED_MOTOR = 150;
boolean fire = false;
boolean search = false;
int DELAY = 100;
void setup() {
  // put your setup code here, to run once:
  pinMode(DCMOTOR, OUTPUT);

  // FLAME SENSORS
  pinMode(5, INPUT); //FS_RIGHT
  pinMode(6, INPUT); //FS_CENTER
  pinMode(7, INPUT); //FS_LEFT

  //MOTOR PINS
  pinMode(8, OUTPUT); //dirmotor1
  pinMode(9, OUTPUT); //spdmotor1
  pinMode(10, OUTPUT);     //spdmotor2
  pinMode(11, OUTPUT);     //dirmotor2

}

void loop() {
  // put your main code here, to run repeatedly:
  int FLAME_CENTER = digitalRead(6);
  TURN_RIGHT();
  if (FLAME_CENTER == 0) {
    STOP();
    PUT_OFF_FIRE();

  }

}

void PUT_OFF_FIRE() {
 STOP();
  delay(1000);
  //  digitalWrite(RELAY_DC, HIGH);
  digitalWrite(DCMOTOR, HIGH);
  delay(5000);
  digitalWrite(DCMOTOR, LOW);
  delay(1000);


}

void FORWARD() {
  digitalWrite(8, HIGH);
  analogWrite(9, SPEED_MOTOR);
  analogWrite(10, SPEED_MOTOR);
  digitalWrite(11, HIGH);
}
void TURN_RIGHT() {
  digitalWrite(8, HIGH);
  analogWrite(9, SPEED_MOTOR);
  analogWrite(10, SPEED_MOTOR);
  digitalWrite(11, LOW);
}
void TURN_LEFT() {
  digitalWrite(8, LOW);
  analogWrite(9, SPEED_MOTOR);
  analogWrite(10, SPEED_MOTOR);
  digitalWrite(11, HIGH);
}
void STOP() {
  //digitalWrite(8, HIGH);
  analogWrite(9, 0);
  analogWrite(10, 0);
  //digitalWrite(11, HIGH);
}