4-digit Password Access System

Arduino 4-digit password access system.

Jun 29, 2022

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weather

environmental sensing

monitoring

Components and supplies

Jumper wires (generic)

Buzzer

Arduino UNO

Resistor 1k ohm

LED, Green

Tactile Switch, Top Actuated

LED, Red

Breadboard (generic)

Resistor 220 ohm

Alphanumeric LCD, 16 x 2

Apps and platforms

Arduino IDE

Project description

Code

Code:

arduino

1/* Arduino 4-digit password access system.
2
3   Components:
4                -   Arduino Uno
5                - Push button tactile switch (x 4)
6                -   1kOhm resistor (x 4)
7                - 220Ohm resistor (x 3)
8                -   10kOhm potentiometer
9                - Passive buzzer
10                - Red   LED
11                - Green LED
12                - LCD
13                -   Some jumper wires
14
15   Libraries:
16                - LiquidCrystal library
17
18    Documentations: https://en.wikipedia.org/wiki/Telephone_keypad
19
20   Created   on 19 June 2022 by c010rblind3ngineer
21*/
22
23const int btn1 = A1;
24const   int btn2 = A2;
25const int btn3 = A3;
26const int btn4 = A4;
27const int redLED   = A0;
28const int buzzerPin = A5;
29const int greenLED = 6;
30
31int notes[]   = {1209, 1336, 1477, 1633}; // frequencies referenced from wikipedia link above
32int   userInput [5] ;
33int password [5] = {2, 3, 4, 1};
34// TAKE NOTE: The number   of 'beeps' correspond to the MISMATCHED user input and password,
35// Example...   User input = 1, 2, 4, 3....
36// The number '4' here is at the same position as   the password array number '4',
37// so the beep will happen only 3 times during   "Access Denied" since the rest of the
38// numbers in the array doesn't match   each other.
39int keyCounter = 0;
40
41char entryOK [] = "Access Granted";
42char   entryNOTOK [] = "Access Denied";
43
44#include <LiquidCrystal.h>
45
46LiquidCrystal   lcd(12, 11, 5, 4, 3, 2);
47
48void setup() {
49  pinMode(btn1, INPUT);
50  pinMode(btn2,   INPUT);
51  pinMode(btn3, INPUT);
52  pinMode(btn4, INPUT);
53  pinMode(redLED,   OUTPUT);
54  pinMode(greenLED, OUTPUT);
55  pinMode(buzzerPin, OUTPUT);
56
57   lcd.begin(16, 2);
58  lcd.setCursor(0, 0);
59}
60
61void loop() {
62  lcd.print("Enter   4-digit");
63  lcd.setCursor(0, 1);
64  lcd.print("password: ");
65  lcd.blink();
66
67   // 'for' loop ensures the User only press 4 buttons
68  for (int i = 0; i < 4;)   {
69
70    if (digitalRead(btn1) == HIGH) {  // button 1 pressed
71      digitalWrite(redLED,   HIGH);
72      tone(buzzerPin, notes[0]);
73
74      lcd.print("1");
75      userInput[i]   = 1;
76      i++;
77      delay(250);
78    }
79    else if (digitalRead(btn2)   == HIGH) { // button 2 pressed
80      digitalWrite(redLED, HIGH);
81      tone(buzzerPin,   notes[1]);
82
83      lcd.print("2");
84      userInput[i] = 2;
85      i++;
86       delay(250);
87    }
88    else if (digitalRead(btn3) == HIGH) { // button   3 pressed
89      digitalWrite(redLED, HIGH);
90      tone(buzzerPin, notes[2]);
91
92       lcd.print("3");
93      userInput[i] = 3;
94      i++;
95      delay(250);
96     }
97    else if (digitalRead(btn4) == HIGH) { // button 4 pressed
98      digitalWrite(redLED,   HIGH);
99      tone(buzzerPin, notes[3]);
100
101      lcd.print("4");
102      userInput[i]   = 4;
103      i++;
104      delay(250);
105    }
106    else {
107      digitalWrite(redLED,   LOW);
108      digitalWrite(btn1, LOW);
109      digitalWrite(btn2, LOW);
110      digitalWrite(btn3,   LOW);
111      digitalWrite(btn4, LOW);
112      noTone(buzzerPin);
113    }
114   }
115  lcd.noBlink();
116  lcd.clear();
117  noTone(buzzerPin);
118  digitalWrite(redLED,   LOW);
119
120  // 'for' loop check if the 4-digit password is the same as User input
121   for (int j = 0; j < 4; j++) {
122    if (userInput[j] == password[j]) {
123      keyCounter++;
124       //...Access Granted...
125      if (keyCounter == 4) {
126        digitalWrite(greenLED,   HIGH);
127        tone(buzzerPin, 2000);
128        delay(100);
129        noTone(buzzerPin);
130         delay(100);
131        tone(buzzerPin, 2000);
132        delay(100);
133         noTone(buzzerPin);
134        lcd.noBlink();
135        lcd.print(entryOK);
136         delay(2000);
137        keyCounter = 0;
138        lcd.clear();
139      }
140     }
141    //...Access Denied...
142    else {
143      digitalWrite(redLED, HIGH);
144       lcd.noBlink();
145      lcd.print(entryNOTOK);
146      delay(100);
147      tone(buzzerPin,   500);
148      delay(250);
149      noTone(buzzerPin);
150      keyCounter = 0;
151       lcd.clear();
152    }
153  }
154  // reset LCD
155  digitalWrite(greenLED,   LOW);
156  digitalWrite(redLED, LOW);
157  lcd.clear();
158  delay(500);
159}
160

/* Arduino 4-digit password access system.

   Components:
                -   Arduino Uno
                - Push button tactile switch (x 4)
                -   1kOhm resistor (x 4)
                - 220Ohm resistor (x 3)
                -   10kOhm potentiometer
                - Passive buzzer
                - Red   LED
                - Green LED
                - LCD
                -   Some jumper wires

   Libraries:
                - LiquidCrystal library

    Documentations: https://en.wikipedia.org/wiki/Telephone_keypad

   Created   on 19 June 2022 by c010rblind3ngineer
*/

const int btn1 = A1;
const   int btn2 = A2;
const int btn3 = A3;
const int btn4 = A4;
const int redLED   = A0;
const int buzzerPin = A5;
const int greenLED = 6;

int notes[]   = {1209, 1336, 1477, 1633}; // frequencies referenced from wikipedia link above
int   userInput [5] ;
int password [5] = {2, 3, 4, 1};
// TAKE NOTE: The number   of 'beeps' correspond to the MISMATCHED user input and password,
// Example...   User input = 1, 2, 4, 3....
// The number '4' here is at the same position as   the password array number '4',
// so the beep will happen only 3 times during   "Access Denied" since the rest of the
// numbers in the array doesn't match   each other.
int keyCounter = 0;

char entryOK [] = "Access Granted";
char   entryNOTOK [] = "Access Denied";

#include <LiquidCrystal.h>

LiquidCrystal   lcd(12, 11, 5, 4, 3, 2);

void setup() {
  pinMode(btn1, INPUT);
  pinMode(btn2,   INPUT);
  pinMode(btn3, INPUT);
  pinMode(btn4, INPUT);
  pinMode(redLED,   OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

   lcd.begin(16, 2);
  lcd.setCursor(0, 0);
}

void loop() {
  lcd.print("Enter   4-digit");
  lcd.setCursor(0, 1);
  lcd.print("password: ");
  lcd.blink();

   // 'for' loop ensures the User only press 4 buttons
  for (int i = 0; i < 4;)   {

    if (digitalRead(btn1) == HIGH) {  // button 1 pressed
      digitalWrite(redLED,   HIGH);
      tone(buzzerPin, notes[0]);

      lcd.print("1");
      userInput[i]   = 1;
      i++;
      delay(250);
    }
    else if (digitalRead(btn2)   == HIGH) { // button 2 pressed
      digitalWrite(redLED, HIGH);
      tone(buzzerPin,   notes[1]);

      lcd.print("2");
      userInput[i] = 2;
      i++;
       delay(250);
    }
    else if (digitalRead(btn3) == HIGH) { // button   3 pressed
      digitalWrite(redLED, HIGH);
      tone(buzzerPin, notes[2]);

       lcd.print("3");
      userInput[i] = 3;
      i++;
      delay(250);
     }
    else if (digitalRead(btn4) == HIGH) { // button 4 pressed
      digitalWrite(redLED,   HIGH);
      tone(buzzerPin, notes[3]);

      lcd.print("4");
      userInput[i]   = 4;
      i++;
      delay(250);
    }
    else {
      digitalWrite(redLED,   LOW);
      digitalWrite(btn1, LOW);
      digitalWrite(btn2, LOW);
      digitalWrite(btn3,   LOW);
      digitalWrite(btn4, LOW);
      noTone(buzzerPin);
    }
   }
  lcd.noBlink();
  lcd.clear();
  noTone(buzzerPin);
  digitalWrite(redLED,   LOW);

  // 'for' loop check if the 4-digit password is the same as User input
   for (int j = 0; j < 4; j++) {
    if (userInput[j] == password[j]) {
      keyCounter++;
       //...Access Granted...
      if (keyCounter == 4) {
        digitalWrite(greenLED,   HIGH);
        tone(buzzerPin, 2000);
        delay(100);
        noTone(buzzerPin);
         delay(100);
        tone(buzzerPin, 2000);
        delay(100);
         noTone(buzzerPin);
        lcd.noBlink();
        lcd.print(entryOK);
         delay(2000);
        keyCounter = 0;
        lcd.clear();
      }
     }
    //...Access Denied...
    else {
      digitalWrite(redLED, HIGH);
       lcd.noBlink();
      lcd.print(entryNOTOK);
      delay(100);
      tone(buzzerPin,   500);
      delay(250);
      noTone(buzzerPin);
      keyCounter = 0;
       lcd.clear();
    }
  }
  // reset LCD
  digitalWrite(greenLED,   LOW);
  digitalWrite(redLED, LOW);
  lcd.clear();
  delay(500);
}

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Code:

arduino

1/* Arduino 4-digit password access system.
2
3   Components:
4                -  Arduino Uno
5                - Push button tactile switch (x 4)
6                -  1kOhm resistor (x 4)
7                - 220Ohm resistor (x 3)
8                -  10kOhm potentiometer
9                - Passive buzzer
10                - Red  LED
11                - Green LED
12                - LCD
13                -  Some jumper wires
14
15   Libraries:
16                - LiquidCrystal library
17
18   Documentations: https://en.wikipedia.org/wiki/Telephone_keypad
19
20   Created  on 19 June 2022 by c010rblind3ngineer
21*/
22
23const int btn1 = A1;
24const  int btn2 = A2;
25const int btn3 = A3;
26const int btn4 = A4;
27const int redLED  = A0;
28const int buzzerPin = A5;
29const int greenLED = 6;
30
31int notes[]  = {1209, 1336, 1477, 1633}; // frequencies referenced from wikipedia link above
32int  userInput [5] ;
33int password [5] = {2, 3, 4, 1};
34// TAKE NOTE: The number  of 'beeps' correspond to the MISMATCHED user input and password,
35// Example...  User input = 1, 2, 4, 3....
36// The number '4' here is at the same position as  the password array number '4',
37// so the beep will happen only 3 times during  "Access Denied" since the rest of the
38// numbers in the array doesn't match  each other.
39int keyCounter = 0;
40
41char entryOK [] = "Access Granted";
42char  entryNOTOK [] = "Access Denied";
43
44#include <LiquidCrystal.h>
45
46LiquidCrystal  lcd(12, 11, 5, 4, 3, 2);
47
48void setup() {
49  pinMode(btn1, INPUT);
50  pinMode(btn2,  INPUT);
51  pinMode(btn3, INPUT);
52  pinMode(btn4, INPUT);
53  pinMode(redLED,  OUTPUT);
54  pinMode(greenLED, OUTPUT);
55  pinMode(buzzerPin, OUTPUT);
56
57  lcd.begin(16, 2);
58  lcd.setCursor(0, 0);
59}
60
61void loop() {
62  lcd.print("Enter  4-digit");
63  lcd.setCursor(0, 1);
64  lcd.print("password: ");
65  lcd.blink();
66
67  // 'for' loop ensures the User only press 4 buttons
68  for (int i = 0; i < 4;)  {
69
70    if (digitalRead(btn1) == HIGH) {  // button 1 pressed
71      digitalWrite(redLED,  HIGH);
72      tone(buzzerPin, notes[0]);
73
74      lcd.print("1");
75      userInput[i]  = 1;
76      i++;
77      delay(250);
78    }
79    else if (digitalRead(btn2)  == HIGH) { // button 2 pressed
80      digitalWrite(redLED, HIGH);
81      tone(buzzerPin,  notes[1]);
82
83      lcd.print("2");
84      userInput[i] = 2;
85      i++;
86      delay(250);
87    }
88    else if (digitalRead(btn3) == HIGH) { // button  3 pressed
89      digitalWrite(redLED, HIGH);
90      tone(buzzerPin, notes[2]);
91
92      lcd.print("3");
93      userInput[i] = 3;
94      i++;
95      delay(250);
96    }
97    else if (digitalRead(btn4) == HIGH) { // button 4 pressed
98      digitalWrite(redLED,  HIGH);
99      tone(buzzerPin, notes[3]);
100
101      lcd.print("4");
102      userInput[i]  = 4;
103      i++;
104      delay(250);
105    }
106    else {
107      digitalWrite(redLED,  LOW);
108      digitalWrite(btn1, LOW);
109      digitalWrite(btn2, LOW);
110      digitalWrite(btn3,  LOW);
111      digitalWrite(btn4, LOW);
112      noTone(buzzerPin);
113    }
114  }
115  lcd.noBlink();
116  lcd.clear();
117  noTone(buzzerPin);
118  digitalWrite(redLED,  LOW);
119
120  // 'for' loop check if the 4-digit password is the same as User input
121  for (int j = 0; j < 4; j++) {
122    if (userInput[j] == password[j]) {
123      keyCounter++;
124      //...Access Granted...
125      if (keyCounter == 4) {
126        digitalWrite(greenLED,  HIGH);
127        tone(buzzerPin, 2000);
128        delay(100);
129        noTone(buzzerPin);
130        delay(100);
131        tone(buzzerPin, 2000);
132        delay(100);
133        noTone(buzzerPin);
134        lcd.noBlink();
135        lcd.print(entryOK);
136        delay(2000);
137        keyCounter = 0;
138        lcd.clear();
139      }
140    }
141    //...Access Denied...
142    else {
143      digitalWrite(redLED, HIGH);
144      lcd.noBlink();
145      lcd.print(entryNOTOK);
146      delay(100);
147      tone(buzzerPin,  500);
148      delay(250);
149      noTone(buzzerPin);
150      keyCounter = 0;
151      lcd.clear();
152    }
153  }
154  // reset LCD
155  digitalWrite(greenLED,  LOW);
156  digitalWrite(redLED, LOW);
157  lcd.clear();
158  delay(500);
159}
160

/* Arduino 4-digit password access system.

   Components:
                -  Arduino Uno
                - Push button tactile switch (x 4)
                -  1kOhm resistor (x 4)
                - 220Ohm resistor (x 3)
                -  10kOhm potentiometer
                - Passive buzzer
                - Red  LED
                - Green LED
                - LCD
                -  Some jumper wires

   Libraries:
                - LiquidCrystal library

   Documentations: https://en.wikipedia.org/wiki/Telephone_keypad

   Created  on 19 June 2022 by c010rblind3ngineer
*/

const int btn1 = A1;
const  int btn2 = A2;
const int btn3 = A3;
const int btn4 = A4;
const int redLED  = A0;
const int buzzerPin = A5;
const int greenLED = 6;

int notes[]  = {1209, 1336, 1477, 1633}; // frequencies referenced from wikipedia link above
int  userInput [5] ;
int password [5] = {2, 3, 4, 1};
// TAKE NOTE: The number  of 'beeps' correspond to the MISMATCHED user input and password,
// Example...  User input = 1, 2, 4, 3....
// The number '4' here is at the same position as  the password array number '4',
// so the beep will happen only 3 times during  "Access Denied" since the rest of the
// numbers in the array doesn't match  each other.
int keyCounter = 0;

char entryOK [] = "Access Granted";
char  entryNOTOK [] = "Access Denied";

#include <LiquidCrystal.h>

LiquidCrystal  lcd(12, 11, 5, 4, 3, 2);

void setup() {
  pinMode(btn1, INPUT);
  pinMode(btn2,  INPUT);
  pinMode(btn3, INPUT);
  pinMode(btn4, INPUT);
  pinMode(redLED,  OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
}

void loop() {
  lcd.print("Enter  4-digit");
  lcd.setCursor(0, 1);
  lcd.print("password: ");
  lcd.blink();

  // 'for' loop ensures the User only press 4 buttons
  for (int i = 0; i < 4;)  {

    if (digitalRead(btn1) == HIGH) {  // button 1 pressed
      digitalWrite(redLED,  HIGH);
      tone(buzzerPin, notes[0]);

      lcd.print("1");
      userInput[i]  = 1;
      i++;
      delay(250);
    }
    else if (digitalRead(btn2)  == HIGH) { // button 2 pressed
      digitalWrite(redLED, HIGH);
      tone(buzzerPin,  notes[1]);

      lcd.print("2");
      userInput[i] = 2;
      i++;
      delay(250);
    }
    else if (digitalRead(btn3) == HIGH) { // button  3 pressed
      digitalWrite(redLED, HIGH);
      tone(buzzerPin, notes[2]);

      lcd.print("3");
      userInput[i] = 3;
      i++;
      delay(250);
    }
    else if (digitalRead(btn4) == HIGH) { // button 4 pressed
      digitalWrite(redLED,  HIGH);
      tone(buzzerPin, notes[3]);

      lcd.print("4");
      userInput[i]  = 4;
      i++;
      delay(250);
    }
    else {
      digitalWrite(redLED,  LOW);
      digitalWrite(btn1, LOW);
      digitalWrite(btn2, LOW);
      digitalWrite(btn3,  LOW);
      digitalWrite(btn4, LOW);
      noTone(buzzerPin);
    }
  }
  lcd.noBlink();
  lcd.clear();
  noTone(buzzerPin);
  digitalWrite(redLED,  LOW);

  // 'for' loop check if the 4-digit password is the same as User input
  for (int j = 0; j < 4; j++) {
    if (userInput[j] == password[j]) {
      keyCounter++;
      //...Access Granted...
      if (keyCounter == 4) {
        digitalWrite(greenLED,  HIGH);
        tone(buzzerPin, 2000);
        delay(100);
        noTone(buzzerPin);
        delay(100);
        tone(buzzerPin, 2000);
        delay(100);
        noTone(buzzerPin);
        lcd.noBlink();
        lcd.print(entryOK);
        delay(2000);
        keyCounter = 0;
        lcd.clear();
      }
    }
    //...Access Denied...
    else {
      digitalWrite(redLED, HIGH);
      lcd.noBlink();
      lcd.print(entryNOTOK);
      delay(100);
      tone(buzzerPin,  500);
      delay(250);
      noTone(buzzerPin);
      keyCounter = 0;
      lcd.clear();
    }
  }
  // reset LCD
  digitalWrite(greenLED,  LOW);
  digitalWrite(redLED, LOW);
  lcd.clear();
  delay(500);
}

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