Logical Password Sequence

8-digit password sequence program with situational logic.

Aug 28, 2020

•

14933 views

•

7 respects

security

data collection

monitoring

Components and supplies

Tegg 3x4 Keypad

Arduino UNO

KEYESTUDIO 1602 LCD with I2C backpack

Project description

Code

PasswordLogicProgram.ino

arduino

Program code. Modify to your needs. Have fun with it!

1// Program written by Dan Hostler, August 2020.
2// Feel free to use   as you need to.
3// PayPal donations appreciated at danhostler1985@yahoo.com
4
5
6
7
8//   LIBRARIES. (PLEASE INSTALL THESE LIBRARIES IF YOU HAVE NOT YET)
9#include <Wire.h>                // deals with I2C connections
10#include <LiquidCrystal_I2C.h>  //   activates the LCD I2C library
11#include <Keypad.h>             // activates the   Keypad library
12
13
14
15
16// VARIABLES FOR THE 8-NUMBER PASSWORD INPUT DATA
17#define   Password_Length 9                    // Amount of digits plus one null character   (8 + 1 = 9) defines password length
18char userInput[Password_Length];             //   This variable will store the user input in a string
19char Master[Password_Length]   = "12345678";   // This variable holds the correct password that the user string   must match, change as needed
20char customKey;                              //   This variable holds key input of every key pressed
21byte pressCount = 0;                         //   This variable holds a counter for the amount of times the keys were pressed
22
23
24
25
26//   KEYPAD CONFIGURATION (PLEASE MODIFY THIS SECTION IF YOUR KEYPAD WIRING IS DIFFERENT   FROM BELOW)
27const byte ROWS = 4; // Constants for row and 
28const byte COLS   = 3; // column size of your keypad.
29
30char twelveKeys[ROWS][COLS] =                     //   Physical layout of the keypad being used in this program
31{ 
32    {'1', '2',   '3'}, 
33    {'4', '5', '6'},
34    {'7', '8', '9'},
35    {'C', '0', 'E'} //   C = CLEAR, E = ENTER
36};
37
38byte rowPins[ROWS] = {9, 8, 7, 6};  // Defines   how rowPins are connected on the Arduino to the keypad: 9 = R1, 8 = R2, 7 = R3,   6 = R4
39byte colPins[COLS] = {5, 4, 3};     // Defines how colPins are connected   on the Arduino to the keypad: 5 = C1, 4 = C2, 3 = C3, 2 = C2 (if you have a 4x4   keypad) 
40
41
42
43
44// OBJECT CONFIGURATIONS
45Keypad customKeypad = Keypad(makeKeymap(twelveKeys),   rowPins, colPins, ROWS, COLS); // Creates keypad "object"
46LiquidCrystal_I2C   lcd(0x27, 16, 2);                                                 // Creates LCD   "object" (I2C address, rows, columns)
47
48
49
50
51// PROGRAM SETUP
52void   setup() {
53
54  // LCD Initialization
55  lcd.backlight(); 
56  lcd.init();
57   lcd.clear();
58
59}
60
61
62
63
64// MAIN PROGRAM LOOP
65void loop() {
66
67   lcd.setCursor(0,0);
68  lcd.print(" Type Password:");                                       //   One space is offset to center the text on the LCD
69  customKey = customKeypad.waitForKey();                               // Program will halt here until a key is pushed
70
71   if (customKey != NO_KEY && customKey != 'C' && customKey != 'E')    // If the   user presses the number keys, the data is entered
72  {
73  userInput[pressCount]   = customKey;                                  // Password string is being collected   by the userInput variable
74  lcd.setCursor(pressCount + 4, 1);                                   //   Four is added to pressCount to center the input on the LCD
75  lcd.print("*");                                                      // Asterisks are printed for   confidentiality 
76  pressCount++;                                                       //   Key press count will roll over until 8 digits are entered
77  }
78
79  else if   (customKey == 'C')    // C is to clear the entire password input from any point   and start over again as
80  {                             // it calls up the clearData   function.
81  lcd.clear();
82  clearData(); 
83  }
84
85  else if (customKey   == 'E')    // If less than 8 digits are entered, the input will be invalid and 
86   {                             // an error message will flash, then call the clearData   function to
87  lcd.clear();                  // start the entering process all   over again.
88  lcd.setCursor(0,0);
89  lcd.print("INVALID ENTRY");
90  delay(800);
91   clearData();
92  }
93
94   
95  if (pressCount == 8)         // Once 8 digits   are entered, the function to check the password string is called up and
96  {                            //   both the character and string data are sent to the function.
97  lcd.clear();
98   waitHere();                  
99  }
100
101}
102
103
104// THIS FUNCTION CHECKS   THE PASSWORD STRING
105void waitHere(){
106
107  lcd.setCursor(0,0);
108  lcd.print("   Type Password:"); 
109  lcd.setCursor(0,1);
110  lcd.print("    ********");                    //   Password data is hidden as asterisks for confidentiality purposes and
111                                                //   is offset by 4 spaces to center the input on the LCD
112                                                 
113   customKey = customKeypad.waitForKey();        // Program will halt here until   a key is pushed
114  
115  if (customKey != NO_KEY && customKey == 'E')  // The   ENTER button is pushed and the password goes through the routine.
116  {
117  lcd.clear();
118   lcd.setCursor(0,0);
119    if (!strcmp(userInput, Master))             // The   user input string is matched up with the Master password string and matches up
120     {                                           // running the routine to grant   access before returning back to the beginning.
121    lcd.setCursor(0,0);
122    lcd.print("ACCESS   GRANTED.");
123    lcd.setCursor(0,1);
124    lcd.print("WELCOME!!");
125    delay(5000);
126     clearData(); 
127    }
128    else if (strcmp(userInput, Master))         //   The user input string is matched up with the Master password string and does not   match up
129    {                                           // running the routine   to deny access before returning back to the beginning.
130    lcd.setCursor(0,0);
131     lcd.print("ACCESS DENIED.");
132    delay(2000);
133    clearData(); 
134     }
135  }
136
137  if (customKey != NO_KEY && customKey == 'C')  // If the CLEAR   button is pushed, the data is cleared and the program starts over.
138  {
139  lcd.clear();
140   clearData(); 
141  }
142  
143  if (customKey != NO_KEY && customKey == '0')  //   This numberical button has no purpose and does nothing when pressed.
144  {
145   waitHere();
146  }
147
148  if (customKey != NO_KEY && customKey == '1')  // This   numberical button has no purpose and does nothing when pressed.
149  {
150  waitHere();
151   }
152
153  if (customKey != NO_KEY && customKey == '2')  // This numberical button   has no purpose and does nothing when pressed.
154  {
155  waitHere();
156  }
157
158   if (customKey != NO_KEY && customKey == '3')  // This numberical button has no   purpose and does nothing when pressed.
159  {
160  waitHere();
161  }
162
163  if   (customKey != NO_KEY && customKey == '4')  // This numberical button has no purpose   and does nothing when pressed.
164  {
165  waitHere();
166  }
167
168  if (customKey   != NO_KEY && customKey == '5')  // This numberical button has no purpose and does   nothing when pressed.
169  {
170  waitHere();
171  }
172
173  if (customKey != NO_KEY   && customKey == '6')  // This numberical button has no purpose and does nothing   when pressed.
174  {
175  waitHere();
176  }
177
178  if (customKey != NO_KEY &&   customKey == '7')  // This numberical button has no purpose and does nothing when   pressed.
179  {
180  waitHere();
181  }
182
183  if (customKey != NO_KEY && customKey   == '8')  // This numberical button has no purpose and does nothing when pressed.
184   {
185  waitHere();
186  }
187
188  if (customKey != NO_KEY && customKey == '9')   // This numberical button has no purpose and does nothing when pressed.
189  {
190   waitHere();
191  }
192  
193}
194
195
196
197
198// OPTIONAL FUNCTIONS TO USE   IN CASE YOU WISH TO EXPAND OUT YOUR PROGRAM
199//void accessGranted(){
200//  
201//}
202//
203//void   accessDenied(){
204//  
205//}
206
207
208
209
210// CLEARS THE ARRAY DATA, STARTS   PROGRAM ALL OVER AGAIN
211void clearData() {  
212  while (pressCount != 0) 
213   {
214  userInput[pressCount--] = 0;    // Clears out the user input data, both   digit and string data are reset to zero.
215  }
216  setup();                        //   Returns program back to the beginning
217}
218

// Program written by Dan Hostler, August 2020.
// Feel free to use   as you need to.
// PayPal donations appreciated at danhostler1985@yahoo.com




//   LIBRARIES. (PLEASE INSTALL THESE LIBRARIES IF YOU HAVE NOT YET)
#include <Wire.h>                // deals with I2C connections
#include <LiquidCrystal_I2C.h>  //   activates the LCD I2C library
#include <Keypad.h>             // activates the   Keypad library




// VARIABLES FOR THE 8-NUMBER PASSWORD INPUT DATA
#define   Password_Length 9                    // Amount of digits plus one null character   (8 + 1 = 9) defines password length
char userInput[Password_Length];             //   This variable will store the user input in a string
char Master[Password_Length]   = "12345678";   // This variable holds the correct password that the user string   must match, change as needed
char customKey;                              //   This variable holds key input of every key pressed
byte pressCount = 0;                         //   This variable holds a counter for the amount of times the keys were pressed




//   KEYPAD CONFIGURATION (PLEASE MODIFY THIS SECTION IF YOUR KEYPAD WIRING IS DIFFERENT   FROM BELOW)
const byte ROWS = 4; // Constants for row and 
const byte COLS   = 3; // column size of your keypad.

char twelveKeys[ROWS][COLS] =                     //   Physical layout of the keypad being used in this program
{ 
    {'1', '2',   '3'}, 
    {'4', '5', '6'},
    {'7', '8', '9'},
    {'C', '0', 'E'} //   C = CLEAR, E = ENTER
};

byte rowPins[ROWS] = {9, 8, 7, 6};  // Defines   how rowPins are connected on the Arduino to the keypad: 9 = R1, 8 = R2, 7 = R3,   6 = R4
byte colPins[COLS] = {5, 4, 3};     // Defines how colPins are connected   on the Arduino to the keypad: 5 = C1, 4 = C2, 3 = C3, 2 = C2 (if you have a 4x4   keypad) 




// OBJECT CONFIGURATIONS
Keypad customKeypad = Keypad(makeKeymap(twelveKeys),   rowPins, colPins, ROWS, COLS); // Creates keypad "object"
LiquidCrystal_I2C   lcd(0x27, 16, 2);                                                 // Creates LCD   "object" (I2C address, rows, columns)




// PROGRAM SETUP
void   setup() {

  // LCD Initialization
  lcd.backlight(); 
  lcd.init();
   lcd.clear();

}




// MAIN PROGRAM LOOP
void loop() {

   lcd.setCursor(0,0);
  lcd.print(" Type Password:");                                       //   One space is offset to center the text on the LCD
  customKey = customKeypad.waitForKey();                               // Program will halt here until a key is pushed

   if (customKey != NO_KEY && customKey != 'C' && customKey != 'E')    // If the   user presses the number keys, the data is entered
  {
  userInput[pressCount]   = customKey;                                  // Password string is being collected   by the userInput variable
  lcd.setCursor(pressCount + 4, 1);                                   //   Four is added to pressCount to center the input on the LCD
  lcd.print("*");                                                      // Asterisks are printed for   confidentiality 
  pressCount++;                                                       //   Key press count will roll over until 8 digits are entered
  }

  else if   (customKey == 'C')    // C is to clear the entire password input from any point   and start over again as
  {                             // it calls up the clearData   function.
  lcd.clear();
  clearData(); 
  }

  else if (customKey   == 'E')    // If less than 8 digits are entered, the input will be invalid and 
   {                             // an error message will flash, then call the clearData   function to
  lcd.clear();                  // start the entering process all   over again.
  lcd.setCursor(0,0);
  lcd.print("INVALID ENTRY");
  delay(800);
   clearData();
  }

   
  if (pressCount == 8)         // Once 8 digits   are entered, the function to check the password string is called up and
  {                            //   both the character and string data are sent to the function.
  lcd.clear();
   waitHere();                  
  }

}


// THIS FUNCTION CHECKS   THE PASSWORD STRING
void waitHere(){

  lcd.setCursor(0,0);
  lcd.print("   Type Password:"); 
  lcd.setCursor(0,1);
  lcd.print("    ********");                    //   Password data is hidden as asterisks for confidentiality purposes and
                                                //   is offset by 4 spaces to center the input on the LCD
                                                 
   customKey = customKeypad.waitForKey();        // Program will halt here until   a key is pushed
  
  if (customKey != NO_KEY && customKey == 'E')  // The   ENTER button is pushed and the password goes through the routine.
  {
  lcd.clear();
   lcd.setCursor(0,0);
    if (!strcmp(userInput, Master))             // The   user input string is matched up with the Master password string and matches up
     {                                           // running the routine to grant   access before returning back to the beginning.
    lcd.setCursor(0,0);
    lcd.print("ACCESS   GRANTED.");
    lcd.setCursor(0,1);
    lcd.print("WELCOME!!");
    delay(5000);
     clearData(); 
    }
    else if (strcmp(userInput, Master))         //   The user input string is matched up with the Master password string and does not   match up
    {                                           // running the routine   to deny access before returning back to the beginning.
    lcd.setCursor(0,0);
     lcd.print("ACCESS DENIED.");
    delay(2000);
    clearData(); 
     }
  }

  if (customKey != NO_KEY && customKey == 'C')  // If the CLEAR   button is pushed, the data is cleared and the program starts over.
  {
  lcd.clear();
   clearData(); 
  }
  
  if (customKey != NO_KEY && customKey == '0')  //   This numberical button has no purpose and does nothing when pressed.
  {
   waitHere();
  }

  if (customKey != NO_KEY && customKey == '1')  // This   numberical button has no purpose and does nothing when pressed.
  {
  waitHere();
   }

  if (customKey != NO_KEY && customKey == '2')  // This numberical button   has no purpose and does nothing when pressed.
  {
  waitHere();
  }

   if (customKey != NO_KEY && customKey == '3')  // This numberical button has no   purpose and does nothing when pressed.
  {
  waitHere();
  }

  if   (customKey != NO_KEY && customKey == '4')  // This numberical button has no purpose   and does nothing when pressed.
  {
  waitHere();
  }

  if (customKey   != NO_KEY && customKey == '5')  // This numberical button has no purpose and does   nothing when pressed.
  {
  waitHere();
  }

  if (customKey != NO_KEY   && customKey == '6')  // This numberical button has no purpose and does nothing   when pressed.
  {
  waitHere();
  }

  if (customKey != NO_KEY &&   customKey == '7')  // This numberical button has no purpose and does nothing when   pressed.
  {
  waitHere();
  }

  if (customKey != NO_KEY && customKey   == '8')  // This numberical button has no purpose and does nothing when pressed.
   {
  waitHere();
  }

  if (customKey != NO_KEY && customKey == '9')   // This numberical button has no purpose and does nothing when pressed.
  {
   waitHere();
  }
  
}




// OPTIONAL FUNCTIONS TO USE   IN CASE YOU WISH TO EXPAND OUT YOUR PROGRAM
//void accessGranted(){
//  
//}
//
//void   accessDenied(){
//  
//}




// CLEARS THE ARRAY DATA, STARTS   PROGRAM ALL OVER AGAIN
void clearData() {  
  while (pressCount != 0) 
   {
  userInput[pressCount--] = 0;    // Clears out the user input data, both   digit and string data are reset to zero.
  }
  setup();                        //   Returns program back to the beginning
}

PasswordLogicProgram.ino

arduino

Program code. Modify to your needs. Have fun with it!

1// Program written by Dan Hostler, August 2020.
2// Feel free to use  as you need to.
3// PayPal donations appreciated at danhostler1985@yahoo.com
4
5
6
7
8//  LIBRARIES. (PLEASE INSTALL THESE LIBRARIES IF YOU HAVE NOT YET)
9#include <Wire.h>               // deals with I2C connections
10#include <LiquidCrystal_I2C.h>  //  activates the LCD I2C library
11#include <Keypad.h>             // activates the  Keypad library
12
13
14
15
16// VARIABLES FOR THE 8-NUMBER PASSWORD INPUT DATA
17#define  Password_Length 9                    // Amount of digits plus one null character  (8 + 1 = 9) defines password length
18char userInput[Password_Length];             //  This variable will store the user input in a string
19char Master[Password_Length]  = "12345678";   // This variable holds the correct password that the user string  must match, change as needed
20char customKey;                              //  This variable holds key input of every key pressed
21byte pressCount = 0;                         //  This variable holds a counter for the amount of times the keys were pressed
22
23
24
25
26//  KEYPAD CONFIGURATION (PLEASE MODIFY THIS SECTION IF YOUR KEYPAD WIRING IS DIFFERENT  FROM BELOW)
27const byte ROWS = 4; // Constants for row and 
28const byte COLS  = 3; // column size of your keypad.
29
30char twelveKeys[ROWS][COLS] =                     //  Physical layout of the keypad being used in this program
31{ 
32    {'1', '2',  '3'}, 
33    {'4', '5', '6'},
34    {'7', '8', '9'},
35    {'C', '0', 'E'} //  C = CLEAR, E = ENTER
36};
37
38byte rowPins[ROWS] = {9, 8, 7, 6};  // Defines  how rowPins are connected on the Arduino to the keypad: 9 = R1, 8 = R2, 7 = R3,  6 = R4
39byte colPins[COLS] = {5, 4, 3};     // Defines how colPins are connected  on the Arduino to the keypad: 5 = C1, 4 = C2, 3 = C3, 2 = C2 (if you have a 4x4  keypad) 
40
41
42
43
44// OBJECT CONFIGURATIONS
45Keypad customKeypad = Keypad(makeKeymap(twelveKeys),  rowPins, colPins, ROWS, COLS); // Creates keypad "object"
46LiquidCrystal_I2C  lcd(0x27, 16, 2);                                                 // Creates LCD  "object" (I2C address, rows, columns)
47
48
49
50
51// PROGRAM SETUP
52void  setup() {
53
54  // LCD Initialization
55  lcd.backlight(); 
56  lcd.init();
57  lcd.clear();
58
59}
60
61
62
63
64// MAIN PROGRAM LOOP
65void loop() {
66
67  lcd.setCursor(0,0);
68  lcd.print(" Type Password:");                                       //  One space is offset to center the text on the LCD
69  customKey = customKeypad.waitForKey();                              // Program will halt here until a key is pushed
70
71  if (customKey != NO_KEY && customKey != 'C' && customKey != 'E')    // If the  user presses the number keys, the data is entered
72  {
73  userInput[pressCount]  = customKey;                                  // Password string is being collected  by the userInput variable
74  lcd.setCursor(pressCount + 4, 1);                                   //  Four is added to pressCount to center the input on the LCD
75  lcd.print("*");                                                     // Asterisks are printed for  confidentiality 
76  pressCount++;                                                       //  Key press count will roll over until 8 digits are entered
77  }
78
79  else if  (customKey == 'C')    // C is to clear the entire password input from any point  and start over again as
80  {                             // it calls up the clearData  function.
81  lcd.clear();
82  clearData(); 
83  }
84
85  else if (customKey  == 'E')    // If less than 8 digits are entered, the input will be invalid and 
86  {                             // an error message will flash, then call the clearData  function to
87  lcd.clear();                  // start the entering process all  over again.
88  lcd.setCursor(0,0);
89  lcd.print("INVALID ENTRY");
90  delay(800);
91  clearData();
92  }
93
94   
95  if (pressCount == 8)         // Once 8 digits  are entered, the function to check the password string is called up and
96  {                            //  both the character and string data are sent to the function.
97  lcd.clear();
98  waitHere();                  
99  }
100
101}
102
103
104// THIS FUNCTION CHECKS  THE PASSWORD STRING
105void waitHere(){
106
107  lcd.setCursor(0,0);
108  lcd.print("  Type Password:"); 
109  lcd.setCursor(0,1);
110  lcd.print("    ********");                    //  Password data is hidden as asterisks for confidentiality purposes and
111                                                //  is offset by 4 spaces to center the input on the LCD
112                                                 
113  customKey = customKeypad.waitForKey();        // Program will halt here until  a key is pushed
114  
115  if (customKey != NO_KEY && customKey == 'E')  // The  ENTER button is pushed and the password goes through the routine.
116  {
117  lcd.clear();
118  lcd.setCursor(0,0);
119    if (!strcmp(userInput, Master))             // The  user input string is matched up with the Master password string and matches up
120    {                                           // running the routine to grant  access before returning back to the beginning.
121    lcd.setCursor(0,0);
122    lcd.print("ACCESS  GRANTED.");
123    lcd.setCursor(0,1);
124    lcd.print("WELCOME!!");
125    delay(5000);
126    clearData(); 
127    }
128    else if (strcmp(userInput, Master))         //  The user input string is matched up with the Master password string and does not  match up
129    {                                           // running the routine  to deny access before returning back to the beginning.
130    lcd.setCursor(0,0);
131    lcd.print("ACCESS DENIED.");
132    delay(2000);
133    clearData(); 
134    }
135  }
136
137  if (customKey != NO_KEY && customKey == 'C')  // If the CLEAR  button is pushed, the data is cleared and the program starts over.
138  {
139  lcd.clear();
140  clearData(); 
141  }
142  
143  if (customKey != NO_KEY && customKey == '0')  //  This numberical button has no purpose and does nothing when pressed.
144  {
145  waitHere();
146  }
147
148  if (customKey != NO_KEY && customKey == '1')  // This  numberical button has no purpose and does nothing when pressed.
149  {
150  waitHere();
151  }
152
153  if (customKey != NO_KEY && customKey == '2')  // This numberical button  has no purpose and does nothing when pressed.
154  {
155  waitHere();
156  }
157
158  if (customKey != NO_KEY && customKey == '3')  // This numberical button has no  purpose and does nothing when pressed.
159  {
160  waitHere();
161  }
162
163  if  (customKey != NO_KEY && customKey == '4')  // This numberical button has no purpose  and does nothing when pressed.
164  {
165  waitHere();
166  }
167
168  if (customKey  != NO_KEY && customKey == '5')  // This numberical button has no purpose and does  nothing when pressed.
169  {
170  waitHere();
171  }
172
173  if (customKey != NO_KEY  && customKey == '6')  // This numberical button has no purpose and does nothing  when pressed.
174  {
175  waitHere();
176  }
177
178  if (customKey != NO_KEY &&  customKey == '7')  // This numberical button has no purpose and does nothing when  pressed.
179  {
180  waitHere();
181  }
182
183  if (customKey != NO_KEY && customKey  == '8')  // This numberical button has no purpose and does nothing when pressed.
184  {
185  waitHere();
186  }
187
188  if (customKey != NO_KEY && customKey == '9')  // This numberical button has no purpose and does nothing when pressed.
189  {
190  waitHere();
191  }
192  
193}
194
195
196
197
198// OPTIONAL FUNCTIONS TO USE  IN CASE YOU WISH TO EXPAND OUT YOUR PROGRAM
199//void accessGranted(){
200//  
201//}
202//
203//void  accessDenied(){
204//  
205//}
206
207
208
209
210// CLEARS THE ARRAY DATA, STARTS  PROGRAM ALL OVER AGAIN
211void clearData() {  
212  while (pressCount != 0) 
213  {
214  userInput[pressCount--] = 0;    // Clears out the user input data, both  digit and string data are reset to zero.
215  }
216  setup();                        //  Returns program back to the beginning
217}
218

// Program written by Dan Hostler, August 2020.
// Feel free to use  as you need to.
// PayPal donations appreciated at danhostler1985@yahoo.com




//  LIBRARIES. (PLEASE INSTALL THESE LIBRARIES IF YOU HAVE NOT YET)
#include <Wire.h>               // deals with I2C connections
#include <LiquidCrystal_I2C.h>  //  activates the LCD I2C library
#include <Keypad.h>             // activates the  Keypad library




// VARIABLES FOR THE 8-NUMBER PASSWORD INPUT DATA
#define  Password_Length 9                    // Amount of digits plus one null character  (8 + 1 = 9) defines password length
char userInput[Password_Length];             //  This variable will store the user input in a string
char Master[Password_Length]  = "12345678";   // This variable holds the correct password that the user string  must match, change as needed
char customKey;                              //  This variable holds key input of every key pressed
byte pressCount = 0;                         //  This variable holds a counter for the amount of times the keys were pressed




//  KEYPAD CONFIGURATION (PLEASE MODIFY THIS SECTION IF YOUR KEYPAD WIRING IS DIFFERENT  FROM BELOW)
const byte ROWS = 4; // Constants for row and 
const byte COLS  = 3; // column size of your keypad.

char twelveKeys[ROWS][COLS] =                     //  Physical layout of the keypad being used in this program
{ 
    {'1', '2',  '3'}, 
    {'4', '5', '6'},
    {'7', '8', '9'},
    {'C', '0', 'E'} //  C = CLEAR, E = ENTER
};

byte rowPins[ROWS] = {9, 8, 7, 6};  // Defines  how rowPins are connected on the Arduino to the keypad: 9 = R1, 8 = R2, 7 = R3,  6 = R4
byte colPins[COLS] = {5, 4, 3};     // Defines how colPins are connected  on the Arduino to the keypad: 5 = C1, 4 = C2, 3 = C3, 2 = C2 (if you have a 4x4  keypad) 




// OBJECT CONFIGURATIONS
Keypad customKeypad = Keypad(makeKeymap(twelveKeys),  rowPins, colPins, ROWS, COLS); // Creates keypad "object"
LiquidCrystal_I2C  lcd(0x27, 16, 2);                                                 // Creates LCD  "object" (I2C address, rows, columns)




// PROGRAM SETUP
void  setup() {

  // LCD Initialization
  lcd.backlight(); 
  lcd.init();
  lcd.clear();

}




// MAIN PROGRAM LOOP
void loop() {

  lcd.setCursor(0,0);
  lcd.print(" Type Password:");                                       //  One space is offset to center the text on the LCD
  customKey = customKeypad.waitForKey();                              // Program will halt here until a key is pushed

  if (customKey != NO_KEY && customKey != 'C' && customKey != 'E')    // If the  user presses the number keys, the data is entered
  {
  userInput[pressCount]  = customKey;                                  // Password string is being collected  by the userInput variable
  lcd.setCursor(pressCount + 4, 1);                                   //  Four is added to pressCount to center the input on the LCD
  lcd.print("*");                                                     // Asterisks are printed for  confidentiality 
  pressCount++;                                                       //  Key press count will roll over until 8 digits are entered
  }

  else if  (customKey == 'C')    // C is to clear the entire password input from any point  and start over again as
  {                             // it calls up the clearData  function.
  lcd.clear();
  clearData(); 
  }

  else if (customKey  == 'E')    // If less than 8 digits are entered, the input will be invalid and 
  {                             // an error message will flash, then call the clearData  function to
  lcd.clear();                  // start the entering process all  over again.
  lcd.setCursor(0,0);
  lcd.print("INVALID ENTRY");
  delay(800);
  clearData();
  }

   
  if (pressCount == 8)         // Once 8 digits  are entered, the function to check the password string is called up and
  {                            //  both the character and string data are sent to the function.
  lcd.clear();
  waitHere();                  
  }

}


// THIS FUNCTION CHECKS  THE PASSWORD STRING
void waitHere(){

  lcd.setCursor(0,0);
  lcd.print("  Type Password:"); 
  lcd.setCursor(0,1);
  lcd.print("    ********");                    //  Password data is hidden as asterisks for confidentiality purposes and
                                                //  is offset by 4 spaces to center the input on the LCD
                                                 
  customKey = customKeypad.waitForKey();        // Program will halt here until  a key is pushed
  
  if (customKey != NO_KEY && customKey == 'E')  // The  ENTER button is pushed and the password goes through the routine.
  {
  lcd.clear();
  lcd.setCursor(0,0);
    if (!strcmp(userInput, Master))             // The  user input string is matched up with the Master password string and matches up
    {                                           // running the routine to grant  access before returning back to the beginning.
    lcd.setCursor(0,0);
    lcd.print("ACCESS  GRANTED.");
    lcd.setCursor(0,1);
    lcd.print("WELCOME!!");
    delay(5000);
    clearData(); 
    }
    else if (strcmp(userInput, Master))         //  The user input string is matched up with the Master password string and does not  match up
    {                                           // running the routine  to deny access before returning back to the beginning.
    lcd.setCursor(0,0);
    lcd.print("ACCESS DENIED.");
    delay(2000);
    clearData(); 
    }
  }

  if (customKey != NO_KEY && customKey == 'C')  // If the CLEAR  button is pushed, the data is cleared and the program starts over.
  {
  lcd.clear();
  clearData(); 
  }
  
  if (customKey != NO_KEY && customKey == '0')  //  This numberical button has no purpose and does nothing when pressed.
  {
  waitHere();
  }

  if (customKey != NO_KEY && customKey == '1')  // This  numberical button has no purpose and does nothing when pressed.
  {
  waitHere();
  }

  if (customKey != NO_KEY && customKey == '2')  // This numberical button  has no purpose and does nothing when pressed.
  {
  waitHere();
  }

  if (customKey != NO_KEY && customKey == '3')  // This numberical button has no  purpose and does nothing when pressed.
  {
  waitHere();
  }

  if  (customKey != NO_KEY && customKey == '4')  // This numberical button has no purpose  and does nothing when pressed.
  {
  waitHere();
  }

  if (customKey  != NO_KEY && customKey == '5')  // This numberical button has no purpose and does  nothing when pressed.
  {
  waitHere();
  }

  if (customKey != NO_KEY  && customKey == '6')  // This numberical button has no purpose and does nothing  when pressed.
  {
  waitHere();
  }

  if (customKey != NO_KEY &&  customKey == '7')  // This numberical button has no purpose and does nothing when  pressed.
  {
  waitHere();
  }

  if (customKey != NO_KEY && customKey  == '8')  // This numberical button has no purpose and does nothing when pressed.
  {
  waitHere();
  }

  if (customKey != NO_KEY && customKey == '9')  // This numberical button has no purpose and does nothing when pressed.
  {
  waitHere();
  }
  
}




// OPTIONAL FUNCTIONS TO USE  IN CASE YOU WISH TO EXPAND OUT YOUR PROGRAM
//void accessGranted(){
//  
//}
//
//void  accessDenied(){
//  
//}




// CLEARS THE ARRAY DATA, STARTS  PROGRAM ALL OVER AGAIN
void clearData() {  
  while (pressCount != 0) 
  {
  userInput[pressCount--] = 0;    // Clears out the user input data, both  digit and string data are reset to zero.
  }
  setup();                        //  Returns program back to the beginning
}

Downloadable files

Schematic for project setup

This schematic utilizes a 4x4 keypad but you can easily use a 4x3 keypad by negating pin 2.

Schematic for project setup

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