#include <Keypad.h>

const char* password = "427";  // Change the password here, just pick any 3 numbers
int position = 0;

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] = {8, 7, 6, 9};
byte colPins[COLS] = {5, 4, 3, 2};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

int RedpinLock = 12;
int GreenpinUnlock = 13;
int relayPin = 10;  // Define the pin connected to the relay module

void setup() {
  pinMode(RedpinLock, OUTPUT);
  pinMode(GreenpinUnlock, OUTPUT);
  pinMode(relayPin, OUTPUT);
  LockedPosition(true);  // Initially, set to locked position
}

void loop() {
  char key = keypad.getKey();

  if (key == '*' || key == '#') {
    position = 0;
    LockedPosition(true);
  }

  if (key == password[position]) {
    position++;
  }

  if (position == 3) {
    LockedPosition(false);
  }

  delay(100);
}

void LockedPosition(int locked) {
  if (locked) {
    digitalWrite(RedpinLock, HIGH);
    digitalWrite(GreenpinUnlock, LOW);
    digitalWrite(relayPin, LOW);  // Deactivate the relay
  } else {
    digitalWrite(RedpinLock, LOW);
    digitalWrite(GreenpinUnlock, HIGH);
    digitalWrite(relayPin, HIGH);  // Activate the relay
  }
}