IR Remote Controlled LED Chaser Using Arduino

1#include <IRremote.h>
2
3int IRpin = 3;  				// pin for the IR  sensor
4int intr_pin = 2;
5int del = 100;
6IRrecv irrecv(IRpin);
7decode_results  results;
8unsigned long int recv_code,prev_code;
9void setup() 
10{
11 int  i;
12 Serial.begin(9600);
13 Serial.println("IR remote control LED chaser");
14  for(i=4;i<=13;i++)
15   {
16     pinMode(i,OUTPUT);
17     digitalWrite(i,LOW);
18   }
19  irrecv.enableIRIn(); 				// Start the receiver 
20  attachInterrupt(digitalPinToInterrupt(intr_pin),  receive_code, CHANGE);
21 }
22void loop() 
23{
24   if(results.value==2210)  
25        {
26          effect1();
27          irrecv.resume(); 
28        }
29    if(results.value==6308) 
30        {
31          effect1();
32          irrecv.resume();  
33        }  
34    if(results.value==2215) 
35        {
36          effect3();
37          irrecv.resume(); 
38        }  
39   if(results.value==6312) 
40        {
41          effect4();
42          irrecv.resume(); 
43        } 
44    if(results.value==2219)  
45        {
46          effect5();
47          irrecv.resume(); 
48        }   
49    if((recv_code==6338) || (recv_code==2242))
50         {
51            Serial.println("blinking  speed increase");
52            if(del>50) del-=25;             
53            irrecv.resume();  
54            while(!(irrecv.decode(&results)));  
55            
56         }
57    if((recv_code==6292) || (recv_code==2196)) 
58        {
59           Serial.println("blinking  speed decrease");
60           if(del<200) del+=25;            
61           irrecv.resume();   
62           while(!(irrecv.decode(&results)));           
63        } 
64     delay(200);
65      irrecv.resume();          
66    }      
67void receive_code()
68  {
69       if(irrecv.decode(&results)) 
70         {   
71           if(recv_code  != results.value)
72           { 
73            Serial.print("received code ");
74            Serial.println(results.value); 
75            recv_code = results.value;  
76           }               
77         }        
78  }   
79void effect1()
80  {
81    int x; 
82    for(x=3;x<13;x++) 
83      {
84        digitalWrite(x,HIGH);
85        delay(del);
86      } 
87    delay(del);   
88    for(x=3;x<13;x++) 
89      {
90        digitalWrite(x,LOW);
91        delay(del);
92      } 
93    }    
94void effect2()
95  {
96    int x;
97    for(x=3;x<13;x++) 
98      {
99        digitalWrite(x,HIGH);
100        delay(del);
101        digitalWrite(x,LOW);
102      } 
103     delay(del);   
104     for(x=12;x>3;x--) 
105      {
106        digitalWrite(x,HIGH);
107        delay(del);
108        digitalWrite(x,LOW);
109      } 
110    }   
111void  effect3()
112  {
113    int x;
114    for(x=3;x<12;x++) 
115      {
116        digitalWrite(x,HIGH);
117        digitalWrite(x+1,HIGH);
118        delay(del);
119        digitalWrite(x,LOW);
120        digitalWrite(x+1,LOW);
121      } 
122     delay(del);
123     for(x=12;x>4;x--)  
124      {
125        digitalWrite(x,HIGH);
126        digitalWrite(x-1,HIGH);
127        delay(del);
128        digitalWrite(x,LOW);
129        digitalWrite(x-1,LOW);
130      }  
131   }    
132void effect4()
133  {
134    int x;       
135    for(x=3;x<=8;x++)  
136      {
137        digitalWrite(x,HIGH);
138        digitalWrite(15-x,HIGH);
139        delay(del);
140      } 
141    delay(del);   
142    for(x=8;x>=3;x--) 
143      {
144        digitalWrite(x,LOW);
145        digitalWrite(15-x,LOW);
146      }   
147   }       
148 void effect5()
149  {
150    int x;
151    for(x=8;x>=3;x--)  
152      {
153        digitalWrite(x,HIGH);
154        digitalWrite(15-x,HIGH);
155        delay(del);
156      } 
157    delay(del);   
158    for(x=3;x<=8;x++) 
159      {
160        digitalWrite(x,LOW);
161        digitalWrite(15-x,LOW);
162      }   
163   }     
164