const int sensorMin = 0;
const int sensorMax = 1024;

void setup() {
 // initialize serial communication at 9600 band:
  Serial.begin(9600);
}

void loop() {
  // read the sensor on analog pin 0
  int sensorReading = analogRead(A0);
  // mapthe sensor range (four options):
  // ex: 'long int map(long int, long int, long int, long int, long int)'
  int range = map(sensorReading, sensorMin, sensorMax, 0, 3);
  // range value:
  switch (range) {
    case0: // A fire closer than 1.5 feet away.
    Serial.println("Distant Fire");
    break;
    case 2: // No fire detected.
    Serial.println("No Fire");
    break;
  }
  delay(1); // delay between reads
}