It's the Final Countdown!

1// variables to decide which digital pins correspond to which letter
2int  pinA = 2;
3int pinB = 3;
4int pinC = 4;
5int pinD = 5;
6int pinE = 6;
7int  pinF = 7;
8int pinG = 8;
9int pinH = 9;
10int pinI = 10;
11int pinJ = 11;
12
13//  the setup routine runs once when you press reset:
14void setup() {                
15  // initialize the digital pins as outputs.
16  pinMode(pinA, OUTPUT);     
17  pinMode(pinB, OUTPUT);     
18  pinMode(pinC, OUTPUT);     
19  pinMode(pinD,  OUTPUT);     
20  pinMode(pinE, OUTPUT);     
21  pinMode(pinF, OUTPUT);     
22  pinMode(pinG, OUTPUT);   
23  pinMode(pinH, OUTPUT);  
24  pinMode(pinI, OUTPUT);  
25  pinMode(pinJ, OUTPUT);
26   }
27     
28void loop() {
29  // display  number 5 
30  digitalWrite(pinA, HIGH);   
31  digitalWrite(pinB, HIGH);   
32  digitalWrite(pinC, LOW);   
33  digitalWrite(pinD, HIGH);   
34  digitalWrite(pinE,  LOW);   
35  digitalWrite(pinF, LOW);   
36  digitalWrite(pinG, LOW);
37  digitalWrite(pinH,  HIGH);
38  digitalWrite(pinI, LOW);
39  digitalWrite(pinJ, HIGH);   
40  delay(1000);               // wait for a second
41  
42// display number 4
43  digitalWrite(pinA,  HIGH);   
44  digitalWrite(pinB, HIGH);   
45  digitalWrite(pinC, LOW);   
46  digitalWrite(pinD, LOW);   
47  digitalWrite(pinE, HIGH);   
48  digitalWrite(pinF,  LOW);   
49  digitalWrite(pinG, LOW);
50  digitalWrite(pinH, LOW);
51  digitalWrite(pinI,  LOW);
52  digitalWrite(pinJ, HIGH);   
53  delay(1000);               // wait  for a second
54  
55// display number 3
56  digitalWrite(pinA, HIGH);   
57  digitalWrite(pinB, LOW);   
58  digitalWrite(pinC, LOW);   
59  digitalWrite(pinD,  HIGH);   
60  digitalWrite(pinE, HIGH);   
61  digitalWrite(pinF, LOW);   
62  digitalWrite(pinG, LOW);
63  digitalWrite(pinH, HIGH);
64  digitalWrite(pinI,  LOW);
65  digitalWrite(pinJ, HIGH);   
66  delay(1000);               // wait  for a second
67  
68// display number 2
69  digitalWrite(pinA, HIGH);   
70  digitalWrite(pinB, LOW);   
71  digitalWrite(pinC, LOW);   
72  digitalWrite(pinD,  HIGH);   
73  digitalWrite(pinE, HIGH);   
74  digitalWrite(pinF, LOW);   
75  digitalWrite(pinG, HIGH);
76  digitalWrite(pinH, HIGH);
77  digitalWrite(pinI,  LOW);
78  digitalWrite(pinJ, LOW);   
79  delay(1000);               // wait for  a second
80  
81// display number 1
82  digitalWrite(pinA, LOW);   
83  digitalWrite(pinB,  LOW);   
84  digitalWrite(pinC, LOW);   
85  digitalWrite(pinD, LOW);   
86  digitalWrite(pinE,  HIGH);   
87  digitalWrite(pinF, LOW);   
88  digitalWrite(pinG, LOW);
89  digitalWrite(pinH,  LOW);
90  digitalWrite(pinI, LOW);
91  digitalWrite(pinJ, HIGH);   
92  delay(1000);               // wait for a second
93  
94// display number 0
95  digitalWrite(pinA,  LOW);   
96  digitalWrite(pinB, HIGH);   
97  digitalWrite(pinC, LOW);   
98  digitalWrite(pinD, HIGH);   
99  digitalWrite(pinE, HIGH);   
100  digitalWrite(pinF,  HIGH); // pinF boots the LED   
101  digitalWrite(pinG, HIGH);
102  digitalWrite(pinH,  HIGH);
103  digitalWrite(pinI, LOW);
104  digitalWrite(pinJ, HIGH);   
105  delay(500);               // wait for half a second
106  
107// turn the LED off
108  digitalWrite(pinA,  LOW);   
109  digitalWrite(pinB, HIGH);   
110  digitalWrite(pinC, LOW);   
111  digitalWrite(pinD, HIGH);   
112  digitalWrite(pinE, HIGH);   
113  digitalWrite(pinF,  LOW);   
114  digitalWrite(pinG, HIGH);
115  digitalWrite(pinH, HIGH);
116  digitalWrite(pinI,  LOW);
117  digitalWrite(pinJ, HIGH);   
118  delay(500);               // wait for  half a second
119
120// turn the LED on
121  digitalWrite(pinA, LOW);   
122  digitalWrite(pinB,  HIGH);   
123  digitalWrite(pinC, LOW);   
124  digitalWrite(pinD, HIGH);   
125  digitalWrite(pinE, HIGH);   
126  digitalWrite(pinF, HIGH);   
127  digitalWrite(pinG,  HIGH);
128  digitalWrite(pinH, HIGH);
129  digitalWrite(pinI, LOW);
130  digitalWrite(pinJ,  HIGH);   
131  delay(500);               // wait for half a second
132  
133// turn  the LED off
134  digitalWrite(pinA, LOW);   
135  digitalWrite(pinB, HIGH);   
136  digitalWrite(pinC, LOW);   
137  digitalWrite(pinD, HIGH);   
138  digitalWrite(pinE,  HIGH);   
139  digitalWrite(pinF, LOW);   
140  digitalWrite(pinG, HIGH);
141  digitalWrite(pinH,  HIGH);
142  digitalWrite(pinI, LOW);
143  digitalWrite(pinJ, HIGH);   
144  delay(500);               // wait for half a second 
145
146// turn the LED on
147  digitalWrite(pinA,  LOW);   
148  digitalWrite(pinB, HIGH);   
149  digitalWrite(pinC, LOW);   
150  digitalWrite(pinD, HIGH);   
151  digitalWrite(pinE, HIGH);   
152  digitalWrite(pinF,  HIGH);   
153  digitalWrite(pinG, HIGH);
154  digitalWrite(pinH, HIGH);
155  digitalWrite(pinI,  LOW);
156  digitalWrite(pinJ, HIGH);   
157  delay(500);               // wait for  half a second
158  
159// turn the LED off
160  digitalWrite(pinA, LOW);   
161  digitalWrite(pinB, HIGH);   
162  digitalWrite(pinC, LOW);   
163  digitalWrite(pinD,  HIGH);   
164  digitalWrite(pinE, HIGH);   
165  digitalWrite(pinF, LOW);   
166  digitalWrite(pinG, HIGH);
167  digitalWrite(pinH, HIGH);
168  digitalWrite(pinI,  LOW);
169  digitalWrite(pinJ, HIGH);   
170  delay(500);               // wait for  half a second
171  
172//turn the LED on
173  digitalWrite(pinA, LOW);   
174  digitalWrite(pinB,  HIGH);   
175  digitalWrite(pinC, LOW);   
176  digitalWrite(pinD, HIGH);   
177  digitalWrite(pinE, HIGH);   
178  digitalWrite(pinF, HIGH);   
179  digitalWrite(pinG,  HIGH);
180  digitalWrite(pinH, HIGH);
181  digitalWrite(pinI, LOW);
182  digitalWrite(pinJ,  HIGH);   
183  delay(500);               // wait for half a second
184  
185// turn  the LED off
186  digitalWrite(pinA, LOW);   
187  digitalWrite(pinB, HIGH);   
188  digitalWrite(pinC, LOW);   
189  digitalWrite(pinD, HIGH);   
190  digitalWrite(pinE,  HIGH);   
191  digitalWrite(pinF, LOW);   
192  digitalWrite(pinG, HIGH);
193  digitalWrite(pinH,  HIGH);
194  digitalWrite(pinI, LOW);
195  digitalWrite(pinJ, HIGH);   
196  delay(500);               // wait for  half a second
197
198//turn the LED on for 4 seconds
199  digitalWrite(pinA, LOW);   
200  digitalWrite(pinB, HIGH);   
201  digitalWrite(pinC,  LOW);   
202  digitalWrite(pinD, HIGH);   
203  digitalWrite(pinE, HIGH);   
204  digitalWrite(pinF, HIGH);   
205  digitalWrite(pinG, HIGH);
206  digitalWrite(pinH,  HIGH);
207  digitalWrite(pinI, LOW);
208  digitalWrite(pinJ, HIGH);   
209  delay(4000);               // wait for 4 seconds 
210
211  digitalWrite(pinA, LOW);   
212  digitalWrite(pinB,  LOW);   
213  digitalWrite(pinC, LOW);   
214  digitalWrite(pinD, LOW);   
215  digitalWrite(pinE,  LOW);   
216  digitalWrite(pinF, LOW);   
217  digitalWrite(pinG, LOW);
218  digitalWrite(pinH,  LOW);
219  digitalWrite(pinI, LOW);
220  digitalWrite(pinJ, LOW);   
221  delay(10000);               // wait for 10 seconds 
222  }