Flame Detector Sensor, Arduino Tutorial

This is a sample code to show how this cheap component from DealExtreme works with Ardunio (2.5$ with free shipping). These are very useful sensors for building [b]firefighting robots[/b]  :D  Look at the sample code for more info.

Sensor detecting match flame

purchase link:
http://www.dealextreme.com/p/arduino-flame-sensor-for-temperature-detection-blue-dc-3-3-5v-118075

OBS1: I assume this component uses Infrared and should be in direct sight to detect flame. This would work easily on big flames but for a match flame (very small), it could miss it.
OBS2: I read the values with analogRead but I guess they are readable with Digital Read as well as differences are quite high.
-------------------------
/*
  FLAME detector connected to Arduino
  http://www.dealextreme.com/p/arduino-flame-sensor-for-temperature-detection-blue-dc-3-3-5v-118075

 Developer:
 Akbar (Shahab) F. Moghaddam
 20.05.12

 Comment : I assume this component uses Infrared and should be in direct sight to detect flame. This would work easily on big flames but for a match flame (very small), it could miss it.

 */

//CONSTANTS
const int pinD0 = 0;
const int pinA0 = 1;

//VARIABLE
int A = -999;
int D = -999;
int readVal = 0;
boolean logging = false;
boolean fire = false;
boolean changed = true;


void setup() {              
  // initialize the digital pin as an output.
  // Pin 13 has an LED connected on most Arduino boards:
  pinMode(13, OUTPUT);
  pinMode(0, INPUT);
  pinMode(1, INPUT);
  Serial.begin(19200);
}

void loop() {
  initialAll();
  readValues();
  loggingProcess();
  if (changed)
    printState();
  delay(1000);// wait for a second
}

void initialAll(){
  readVal = 0;
}

void readValues(){
  A = analogRead(pinA0);
  D = analogRead(pinD0);
  fireCheck();
  if (Serial.available()>0){
    readVal = Serial.read();
  }
}

void loggingProcess(){
  if (readVal == 'l'){
    if (logging)
      logging = false;
    else
      logging = true;
  }
 
  if (logging){
    Serial.println("------------");
    Serial.println("SYUMMARY");
    Serial.print("A0:");
    Serial.println(A);
    Serial.print("D0:");
    Serial.println(D);
    Serial.println("------------");
  }
}

void printState(){
  if (fire){
    Serial.println("------------");
    Serial.println("FLAME Detected");
    Serial.println("------------");  
  }
  else{
    Serial.println("------------");
    Serial.println("NO FLAME");
    Serial.println("------------");  
  }
  changed = !changed;
}

void fireCheck(){
  if (A < 350 && D < 350){
    fire = true;
    changed = !changed;
  }
  else{
    fire = false;
    changed = !changed;  
  }
}