IR Remote kit Arduino Due using Phototransistor

// Original Library from - https://github.com/enternoescape/Arduino-IRremote-Due 
// Sketch modified by Electromania Dec 2015
// http://theelectromania.blogspot.it/2015/12/home-built-ir-remote-receiver-or.html 
// https://youtu.be/mwgnsFCX03E 

//#include "global_def.h"  // These don't seem to work.  They should.
//#include "ms_remote_map.h" // These don't seem to work.  They should.
#include <IRremote2.h>
// first check Hex code of each key of your remote and then modify the definations below
#define k3 0xFD40BF   // we will define the HEX code for each key of remote (these codes are for my remote)
#define k4 0xFD20DF
#define k5 0xFDA05F
#define k6 0xFD609F
#define k7 0xFD10EF
#define OK 0xFDA857

#define RECV_PIN 11  // pin 11 used to receive IR code

IRrecv irrecv(RECV_PIN);  // reads signal at pin 11
decode_results results; 

void setup(){
  Serial.begin(9600);
  irrecv.enableIRIn(); // Start the receiver
  
  pinMode(3, OUTPUT);  // declare LED as output
   digitalWrite(3, LOW); // to keep LED off by default in the begining
  pinMode(4, OUTPUT);  // declare LED as output
   digitalWrite(4, LOW);
  pinMode(5, OUTPUT);  // declare LED as output
   digitalWrite(5, LOW);
  pinMode(6, OUTPUT);  // declare LED as output
   digitalWrite(6, LOW);
  pinMode(7, OUTPUT);  // declare LED as output
   digitalWrite(7, LOW);
  pinMode(RECV_PIN, INPUT);  // declare LED as output
}

void loop() {
  if (irrecv.decode(&results)) {  //If IR receive results are detected
     Serial.println(results.value, HEX);  // print HEX code of pressed key at serial port
int    Code = results.value;  // HEX code is passed to variable Code
   
   switch (Code) {
     case k3:  // if number 3 key is pressed it will switch ON LED at pin 3 
       {
         digitalWrite(3, HIGH);
       }
      break;
    case k4:
    {     
       digitalWrite(4, HIGH);
     }
    break;
    case k5:
    {      
       digitalWrite(5, HIGH);
    }
    break;
    case k6:
    {      
       digitalWrite(6, HIGH);
    }
    break;
    case k7:
    {      
       digitalWrite(7, HIGH);
    }
    break;

   case OK:          // loop to reset all LEDs to OFF after pressing OK
    {      
        for (int PinNo = 3; PinNo < 8; PinNo++)   
        {
           delay(10);
           digitalWrite(PinNo, LOW);
        }
    }
    break;
    
  default:
    Serial.println("Waiting for commands");   // default case 
  break;
}

    delay(200);  // 1/5 second delay for arbitrary clicks.  
    irrecv.resume(); // Receive the next value
  }
}