arduino flame sensor project

1// lowest and highest sensor readings:
2const int sensorMin = 0;     // sensor minimum
3const int sensorMax = 1024;  // sensor maximum
4
5void setup() {
6  // initialize serial communication @ 9600 baud:
7  Serial.begin(9600);  
8}
9void loop() {
10  // read the sensor on analog A0:
11	int sensorReading = analogRead(A0);
12  // map the sensor range (four options):
13  // ex: 'long int map(long int, long int, long int, long int, long int)'
14	int range = map(sensorReading, sensorMin, sensorMax, 0, 3);
15  
16  // range value:
17  switch (range) {
18  case 0:    // A fire closer than 1.5 feet away.
19    Serial.println("** Close Fire **");
20    break;
21  case 1:    // A fire between 1-3 feet away.
22    Serial.println("** Distant Fire **");
23    break;
24  case 2:    // No fire detected.
25    Serial.println("No Fire");
26    break;
27  }
28  delay(1);  // delay between reads
29}
30