IR Sensor arduino. For Vetal

// Simple Proximity Sensor using Infrared

 int IRpin = A5;               // IR photodiode on analog pin A0
 int IRemitter = 5;            // IR emitter LED on digital pin 2
 int ambientIR;                // variable to store the IR coming from the ambient
 int obstacleIR;               // variable to store the IR coming from the object
 int value[10];                // variable to store the IR values
 int distance;                 // variable that will tell if there is an obstacle or not
 int prevDistance = -1;

 int brightness = 0;

 const int measurementsCount = 2;
 int brightnessArr[measurementsCount];
 int currentPoint = 0;


 void setup() {
   Serial.begin(9600);         // initializing Serial monitor
   pinMode(IRemitter,OUTPUT);  // IR emitter LED on digital pin 2
   digitalWrite(IRemitter,LOW);// setup IR LED as off
   /*
   for (int i = 0; i < measurementsCount; i++) {
     brightnessArr[i] = 0;
   }*/
 }

 void loop() {
   distance = readIR(5);       // calling the function that will read the distance and passing the "accuracy" to it

   if (distance>=0 && distance!=prevDistance) {
     brightness = map(distance, 0, 150, 0, 150);

     analogWrite(10, brightness);
     prevDistance = distance;
   }
   /*
   if (prevDistance != distance) {
//     Serial.println(distance);  // writing the read value on Serial monitor
     prevDistance = distance;

     brightness = map(distance, 0, 80, 0, 150);

     brightnessArr[currentPoint] = brightness;
     currentPoint = (currentPoint + 1) % measurementsCount;
     int val = delta();
     Serial.println(val);
     if (val > 30) {
       analogWrite(10, 254);
     } else {
       analogWrite(10, 30);
     }
   }
   */
   delay(10);
 }

 int delta() {
   int value = 0;
   for (int i = 1; i < measurementsCount; i++) {
     value += abs(brightnessArr[i-1] - brightnessArr[i]);
   }
   return value;
 }

 int readIR(int times) {
   int x, r;

   for(x=0; x<times; x++) {
     digitalWrite(IRemitter,LOW);    // turning the IR LEDs off to read the IR coming from the ambient
     delay(2);                       // minimum delay necessary to read values
     ambientIR = analogRead(IRpin);  // storing IR coming from the ambient

     digitalWrite(IRemitter,HIGH);   // turning the IR LEDs on to read the IR coming from the obstacle
     delay(2);                       // minimum delay necessary to read values
     obstacleIR = analogRead(IRpin); // storing IR coming from the obstacle

     value[x] = ambientIR-obstacleIR;
   }

   for(int x=0;x<times;x++){         // calculating the average based on the "accuracy"
     distance+=value[x];
   }

   return(distance/times);           // return the final value
 }