1
7
8
9const int A=2;
10const int B=3;
11const int C=4;
12const int D=5;
13
14void setup() {
15 pinMode(A0, INPUT);
16 pinMode(A, OUTPUT);
17 pinMode(B, OUTPUT);
18 pinMode(C, OUTPUT);
19 pinMode(D, OUTPUT);
20
21}
22
23int count = 0;
24
25void loop() {
26 if (digitalRead(A0) == LOW)
27 {
28 count++;
29 delay(200);
30 if (count == 10)
31 count = 0;
32 to_BCD();
33 }
34
35 if (count == 10)
36 count = 0;
37
38}
39
40void to_BCD()
41{
42 if (count == 0)
43 {
44 digitalWrite(A, LOW);
45 digitalWrite(B, LOW);
46 digitalWrite(C, LOW);
47 digitalWrite(D, LOW);
48 }
49
50 if (count == 1)
51 {
52 digitalWrite(A, HIGH);
53 digitalWrite(B, LOW);
54 digitalWrite(C, LOW);
55 digitalWrite(D, LOW);
56 }
57
58 if (count == 2)
59 {
60 digitalWrite(A, LOW);
61 digitalWrite(B, HIGH);
62 digitalWrite(C, LOW);
63 digitalWrite(D, LOW);
64 }
65
66 if (count == 3)
67 {
68 digitalWrite(A, HIGH);
69 digitalWrite(B, HIGH);
70 digitalWrite(C, LOW);
71 digitalWrite(D, LOW);
72 }
73
74 if (count == 4)
75 {
76 digitalWrite(A, LOW);
77 digitalWrite(B, LOW);
78 digitalWrite(C, HIGH);
79 digitalWrite(D, LOW);
80 }
81
82 if (count == 5)
83 {
84 digitalWrite(A, HIGH);
85 digitalWrite(B, LOW);
86 digitalWrite(C, HIGH);
87 digitalWrite(D, LOW);
88 }
89
90 if (count == 6)
91 {
92 digitalWrite(A, LOW);
93 digitalWrite(B, HIGH);
94 digitalWrite(C, HIGH);
95 digitalWrite(D, LOW);
96 }
97
98 if (count == 7)
99 {
100 digitalWrite(A, HIGH);
101 digitalWrite(B, HIGH);
102 digitalWrite(C, HIGH);
103 digitalWrite(D, LOW);
104 }
105
106 if (count == 8)
107 {
108 digitalWrite(A, LOW);
109 digitalWrite(B, LOW);
110 digitalWrite(C, LOW);
111 digitalWrite(D, HIGH);
112 }
113
114 if (count == 9)
115 {
116 digitalWrite(A, HIGH);
117 digitalWrite(B, LOW);
118 digitalWrite(C, LOW);
119 digitalWrite(D, HIGH);
120 }
121}
122