I'm creating a door lock for a game

Projects Programming
1

Hi I'm creating a keypad door lock for a game. It will have a 4x4 keypad with an led screen powering a relay for the lock. I'm using an arduino UNO.

#include <Adafruit_Keypad.h>


void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

#include <LiquidCrystal.h>


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

char keys[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 keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

LiquidCrystal lcd(12, 11, 10, 16, 15, 14, 13);

const int relayPin = A0;
int code[4] = {1, 2, 3, 4}; // Default code
int enteredCode[4] = {0, 0, 0, 0};
bool isLocked = true;

void setup() {
  lcd.begin(16, 2);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW);
  lcd.print("Locked");
}

void loop() {
  char key = keypad.getKey();
  
  if (key) {
    lcd.clear();
    lcd.print(key);
    for (int i = 0; i < 4; i++) {
      if (enteredCode[i] == 0) {
        enteredCode[i] = key - '0';
        break;
      }
    }
    
    if (enteredCode[3] != 0) {
      if (checkCode()) {
        isLocked = !isLocked;
        if (isLocked) {
          lcd.clear();
          lcd.print("Locked");
          digitalWrite(relayPin, LOW);
        } else {
          lcd.clear();
          lcd.print("Open");
          digitalWrite(relayPin, HIGH);
        }
      } else {
        lcd.clear();
        lcd.print("Invalid Code");
        delay(1000);
        lcd.clear();
      }
      resetCode();
    }
  }
}

bool checkCode() {
  for (int i = 0; i < 4; i++) {
    if (enteredCode[i] != code[i]) {
      return false;
    }
  }
  return true;
}

void resetCode() {
  for (int i = 0; i < 4; i++) {
    enteredCode[i] = 0;
  }}
2

Cool. Do you have a question?

If your sketch is compiling, is it working?

You can use the serial monitor to find your own mistakes.

Print the value of key variables and confirm that they are plausible and properly inform the flow through your code.

a7

3

Lose those. One loop(), one setup() is all you want.

a7

4

Are you facing any problem?

5

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