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Tsimm
Published © Apache-2.0

Keypad Identification

Typing a code (1, 2, 3, 4) on the keypad will output a message on the LCD.

IntermediateWork in progress791
Keypad Identification

Things used in this project

Hardware components

Breadboard (generic)
Breadboard (generic)
×1
Alphanumeric LCD, 20 x 4
Alphanumeric LCD, 20 x 4
×1
Keypad
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Tape, Electrical
Tape, Electrical

Story

Read more

Schematics

Diagram

Code

Code for keypad

C/C++
#include <Keypad.h>

const byte ROWS = 4; 
const byte COLS = 4; 

char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {9, 8, 7, 6}; 
byte colPins[COLS] = {5, 4, 3, 2}; 

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 

void setup(){
  Serial.begin(9600);
}
  
void loop(){
  char customKey = customKeypad.getKey();
  
  if (customKey){
    Serial.println(customKey);
  }
}
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

const byte ROWS = 4;
const byte COLS = 4;

char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

LiquidCrystal_I2C lcd(0x21, 16, 2);  

void setup(){
  lcd.backlight();
  lcd.init(); 
}

void loop(){
  char customKey = customKeypad.getKey();
  if (customKey){
    lcd.clear();
    lcd.setCursor(0, 0); 
    lcd.print(customKey);
  }
}
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

#define Password_Length 8 

int signalPin = 12;

char Data[Password_Length]; 
char Master[Password_Length] = "123A456"; 
byte data_count = 0, master_count = 0;
bool Pass_is_good;
char customKey;

const byte ROWS = 4;
const byte COLS = 4;

char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

LiquidCrystal_I2C lcd(0x21, 16, 2);  

void setup(){
  lcd.init(); 
  lcd.backlight();
  pinMode(signalPin, OUTPUT);
}

void loop(){

  lcd.setCursor(0,0);
  lcd.print("Enter Password:");

  customKey = customKeypad.getKey();
  if (customKey){
    Data[data_count] = customKey; 
    lcd.setCursor(data_count,1); 
    lcd.print(Data[data_count]); 
    data_count++; 
    }

  if(data_count == Password_Length-1){
    lcd.clear();

    if(!strcmp(Data, Master)){
      lcd.print("Correct");
      digitalWrite(signalPin, HIGH); 
      delay(5000);
      digitalWrite(signalPin, LOW);
      }
    else{
      lcd.print("Incorrect");
      delay(1000);
      }
    
    lcd.clear();
    clearData();  
  }
}

void clearData(){
  while(data_count !=0){
    Data[data_count--] = 0; 
  }
  return;
}

Credits

Tsimm
3 projects • 0 followers

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