Using IR Sensor (TCRT 5000) With Arduino

1/*
2This code is to Remove ambience noise from sensor data.
3IR LED  connected to Digital pin: 6
4IR diode connected to analog input:A3
5
6by-Abhilash  Patel
7*/
8int a,b,c;
9void setup() 
10{
11Serial.begin(9600);
12pinMode(6,OUTPUT);
13}
14
15void  loop() {
16 digitalWrite(6,HIGH);    // Turning ON LED
17 delayMicroseconds(500);  //wait
18 a=analogRead(A3);        //take reading from photodiode(pin A3) :noise+signal
19  digitalWrite(6,LOW);     //turn Off LED
20 delayMicroseconds(500);  //wait
21  b=analogRead(A3);        // again take reading from photodiode :noise
22c=a-b;                    //taking differnce:[ (noise+signal)-(noise)] just signal
23
24//Serial.print(a);         //noise+signal
25//Serial.print("\	");
26//Serial.print(b);         //noise
27//Serial.print("\	");
28Serial.println(c);         // denoised signal
29 
30}