Door Unlock using 4*3 keypad

1#include <Keypad.h>
2
3#include<LiquidCrystal.h>
4
5#include<EEPROM.h>
6#include  <Servo.h>
7Servo myservo;  // create servo object to control a servo
8// twelve  servo objects can be created on most boards
9
10
11LiquidCrystal liquid_crystal_display(12,11,5,4,3,2);
12
13char  password[4];
14
15char initial_password[4],new_password[4];
16
17int i=0;
18
19
20
21char  key_pressed=0;
22
23const byte rows = 4; 
24
25const byte columns = 3; 
26
27char  hexaKeys[rows][columns] = {
28
29{'1','2','3'},
30
31{'4','5','6'},
32
33{'7','8','9'},
34
35{'*','0','#'}
36
37};
38
39byte  row_pins[rows] = {0,1,6,7};
40
41byte column_pins[columns] = {8,10,13};
42   
43
44Keypad  keypad_key = Keypad( makeKeymap(hexaKeys), row_pins, column_pins, rows, columns);
45
46
47
48
49void  setup()
50
51{
52   myservo.attach(9);
53 
54
55  liquid_crystal_display.begin(16,2);
56
57
58
59  liquid_crystal_display.print("keypad doorLock ");
60
61  delay(2000);
62
63  liquid_crystal_display.clear();
64
65  liquid_crystal_display.print("Enter  Password");
66
67  liquid_crystal_display.setCursor(0,1);
68
69  initialpassword();
70}
71
72
73
74
75void  loop()
76
77{
78
79
80
81  key_pressed = keypad_key.getKey();
82
83  if(key_pressed=='*')
84
85    change();
86
87  if (key_pressed)
88
89  {
90
91    password[i++]=key_pressed;
92
93    liquid_crystal_display.print(key_pressed);
94
95      }
96
97  if(i==4)
98
99  {
100
101    delay(200);
102
103    for(int j=0;j<4;j++)
104
105      initial_password[j]=EEPROM.read(j);
106
107    if(!(strncmp(password, initial_password,4)))
108
109    {
110
111      liquid_crystal_display.clear();
112
113      liquid_crystal_display.print("Pass Accepted");
114
115      open_t();
116     
117
118      delay(2000);
119
120      liquid_crystal_display.setCursor(0,1);
121
122      liquid_crystal_display.print("Pres * to change");
123
124      delay(2000);
125
126      liquid_crystal_display.clear();
127
128      liquid_crystal_display.print("Enter  Password:");
129
130      liquid_crystal_display.setCursor(0,1);
131
132      i=0;
133
134
135
136
137    }
138
139    else
140
141    {
142
143
144
145
146      liquid_crystal_display.clear();
147
148      liquid_crystal_display.print("Wrong Password");
149
150      liquid_crystal_display.setCursor(0,1);
151
152      liquid_crystal_display.print("Pres * to Change");
153
154      delay(2000);
155
156      liquid_crystal_display.clear();
157
158      liquid_crystal_display.print("Enter  Password");
159
160      liquid_crystal_display.setCursor(0,1);
161
162      i=0;
163
164
165
166
167    }
168
169  }
170
171}
172
173void change()
174
175{
176
177  int j=0;
178
179  liquid_crystal_display.clear();
180
181  liquid_crystal_display.print("Current  Password");
182
183  liquid_crystal_display.setCursor(0,1);
184
185  while(j<4)
186
187  {
188
189    char key=keypad_key.getKey();
190
191    if(key)
192
193    {
194
195      new_password[j++]=key;
196
197      liquid_crystal_display.print(key);
198
199       
200
201    }
202
203    key=0;
204
205  }
206
207  delay(500);
208
209
210
211
212  if((strncmp(new_password, initial_password, 4)))
213
214  {
215
216    liquid_crystal_display.clear();
217
218    liquid_crystal_display.print("Wrong Password");
219
220    liquid_crystal_display.setCursor(0,1);
221
222    liquid_crystal_display.print("Try Again");
223
224    delay(1000);
225
226  }
227
228  else
229
230  {
231
232    j=0;
233
234    liquid_crystal_display.clear();
235
236    liquid_crystal_display.print("New Password:");
237
238    liquid_crystal_display.setCursor(0,1);
239
240    while(j<4)
241
242    {
243
244      char key=keypad_key.getKey();
245
246      if(key)
247
248      {
249
250        initial_password[j]=key;
251
252        liquid_crystal_display.print(key);
253
254        EEPROM.write(j,key);
255
256        j++;
257
258     
259
260      }
261
262    }
263
264    liquid_crystal_display.print("Pass Changed");
265
266    delay(1000);
267
268  }
269
270  liquid_crystal_display.clear();
271
272  liquid_crystal_display.print("Enter  Password");
273
274  liquid_crystal_display.setCursor(0,1);
275
276  key_pressed=0;
277
278}
279
280
281
282
283void  initialpassword(){
284
285  for(int j=0;j<4;j++)
286
287    EEPROM.write(j, j+49);
288
289  for(int j=0;j<4;j++)
290
291    initial_password[j]=EEPROM.read(j);
292
293}
294void  open_t() {
295  int pos=0;
296  
297
298  for (pos = 0; pos <= 180; pos += 1) {  // goes from 0 degrees to 180 degrees
299    // in steps of 1 degree
300    myservo.write(pos);              // tell servo to go to position in variable 'pos'
301    delay(15);                       // waits 15 ms for the servo to reach the position
302  }
303   liquid_crystal_display.setCursor(0,1);
304      liquid_crystal_display.print("closing..");
305      delay(1000);
306  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees  to 0 degrees
307    myservo.write(pos);              // tell servo to go to position  in variable 'pos'
308    delay(15);                       // waits 15 ms for the  servo to reach the position
309  }
310}