4x4-Matrix-Keypad-Interface-with-Arduino/4x3_Matrix_Keypad_Interface.ino at main · asathiskumar98-byte/4x4-Matrix-Keypad-Interface-with-Arduino · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
const int C1 = 9;
const int C2 = 8;
const int C3 = 7;
const int C4 = 6;

const int R1 = 13;
const int R2 = 12;
const int R3 = 11;
const int R4 = 10;

void Keypad()
{
  digitalWrite(R1,LOW);
  digitalWrite(R2,HIGH);
  digitalWrite(R3,HIGH);
  digitalWrite(R4,HIGH);
  if(digitalRead(C1) == LOW)
  {
    Serial.print('1');
    delay(400);
  }
  if(digitalRead(C2) == LOW)
  {
    Serial.print('2');
    delay(400);
  }
  if(digitalRead(C3) == LOW)
  {
    Serial.print('3');
    delay(400);
  }
  if(digitalRead(C4) == LOW)
  {
    Serial.print('A');
    delay(400);
  }

  digitalWrite(R1,HIGH);
  digitalWrite(R2,LOW);
  digitalWrite(R3,HIGH);
  digitalWrite(R4,HIGH);
  if(digitalRead(C1) == LOW)
  {
    Serial.print('4');
    delay(400);
  }
  if(digitalRead(C2) == LOW)
  {
    Serial.print('5');
    delay(400);
  }
  if(digitalRead(C3) == LOW)
  {
    Serial.print('6');
    delay(400);
  }
  if(digitalRead(C4) == LOW)
  {
    Serial.print('B');
    delay(400);
  }

  digitalWrite(R1,HIGH);
  digitalWrite(R2,HIGH);
  digitalWrite(R3,LOW);
  digitalWrite(R4,HIGH);
  if(digitalRead(C1) == LOW)
  {
    Serial.print('7');
    delay(400);
  }
  if(digitalRead(C2) == LOW)
  {
    Serial.print('8');
    delay(400);
  }
  if(digitalRead(C3) == LOW)
  {
    Serial.print('9');
    delay(400);
  }
  if(digitalRead(C4) == LOW)
  {
    Serial.print('C');
    delay(400);
  }

  digitalWrite(R1,HIGH);
  digitalWrite(R2,HIGH);
  digitalWrite(R3,HIGH);
  digitalWrite(R4,LOW);
  if(digitalRead(C1) == LOW)
  {
    Serial.print('*');
    delay(400);
  }
  if(digitalRead(C2) == LOW)
  {
    Serial.print('0');
    delay(400);
  }
  if(digitalRead(C3) == LOW)
  {
    Serial.print('#');
    delay(400);
  }
  if(digitalRead(C4) == LOW)
  {
    Serial.print('D');
    delay(400);
  }
}

void setup()
{
  pinMode(C1,INPUT_PULLUP);
  pinMode(C2,INPUT_PULLUP);
  pinMode(C3,INPUT_PULLUP);
  pinMode(C4,INPUT_PULLUP);

  pinMode(R1,OUTPUT);
  pinMode(R2,OUTPUT);
  pinMode(R3,OUTPUT);
  pinMode(R4,OUTPUT);

  Serial.begin(9600);
}

void loop()
{
 Keypad();
}