Keypad with Password

Parts:

- 1 Arduino Uno

- 1 4 by 4 keypad

- Assorted Wire

Wiring:

Code:

#include <Keypad.h> //library to simplify accepting input from the keypad
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
//define the cymbols on the buttons of the keypads
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}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad
#define Password_Length 7
char Data[Password_Length]; // 6 is the number of chars it can hold + the null char = 7 
char o_master[Password_Length] = "123456";
byte data_count = 0, master_count = 0;
bool Pass_is_good;


//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
void setup() {
  Serial.begin(9600);
  
  Serial.println("Please enter the password");
}

// the main loop of the program
void loop() {
  char customKey = customKeypad.getKey();
  //only runs when it receives data from the kaypad
  if (customKey) {    
    if (customKey == '#') {
      //compare the array to the password
      if (!strcmp(Data, o_master)) {
        Serial.println("");
        Serial.println("Correct, you may enter");
        clear_data();
        delay(500);
        Serial.println("Please enter the password");
      }
      //if the password doesn't match, ask the user to try again.
      else {
        Serial.println("");
        Serial.println("Incorect. Please try again");
        clear_data();
        delay(500);
        Serial.println("Please enter the open password");
      }
    }
    else if(customKey == '*'){
        clear_data();
        Serial.println("");
        Serial.println("Please enter the password");
    }
    else{
        Serial.print(customKey); //print the current key entry to the serial monitor   
        Data[data_count] = customKey; //place the key entry in the data array  
        data_count ++; // move to the next spot in the array
    }
  }
}

//clears the list of numbers in the keypad array
void clear_data() {
  while (data_count != 0) {
    Data[data_count--] = 0;
  }
  return;
}