Keyless Door Locking System Using Arduino and 4x4 KeyPad

1#include<LiquidCrystal.h>
2
3LiquidCrystal lcd(2,3,4,5,6,7);
4
5int  i=0;
6int ok,cancel,up,down;
7char  count[4];
8char  count1[4];
9char buffer1[20];
10void  setup() {
11  // put your setup code here, to run once:
12lcd.begin(16,2);
13lcd.setCursor(0,0);
14lcd.print("   Login pswd   ");
15
16pinMode(A0,INPUT_PULLUP);
17pinMode(A1,INPUT_PULLUP);
18pinMode(A2,INPUT_PULLUP);
19pinMode(A3,INPUT_PULLUP);
20
21count[0]='0';
22count[1]='0';
23count[2]='0';
24count[3]='0';
25
26}
27
28void  loop() {
29  // put your main code here, to run repeatedly:
30while(1)
31{  
32ok=digitalRead(A0);
33cancel=digitalRead(A1);
34up=digitalRead(A2);
35down=digitalRead(A3);
36if  (ok==LOW)
37{ 
38  while(digitalRead(A0)==LOW);
39  count1[i]=count[i];
40  count[i]='*';
41  i++;
42  
43  if (i>=4)
44  break;
45  
46  }
47if (cancel==LOW)
48{ 
49  while(digitalRead(A1)==LOW);
50  break;
51
52  }
53if (up==LOW)
54{ 
55  while(digitalRead(A2)==LOW);
56  count[i]++;
57  if(count[i]>'9')
58  count[i]='0';
59
60  }
61if (down==LOW)
62{ 
63  while(digitalRead(A3)==LOW);
64  count[i]--;
65  if(count[i]<'0')
66  count[i]='9';
67
68  }
69sprintf(buffer1,"      %c%c%c%c      ",count[0],count[1],count[2],count[3]);  
70lcd.setCursor(0,1);
71lcd.print(buffer1);
72}
73
74if((count1[0]=='1')&&(count1[1]=='2')&&(count1[2]=='3')&&(count1[3]=='4'))
75{
76lcd.setCursor(0,0);  
77lcd.clear();
78lcd.print("Successfully done ");
79  }
80  else
81  {
82lcd.clear();
83lcd.print("faild  ");
84    }
85while(1);
86
87}
88