#include <LiquidCrystal.h>
#include <LiquidCrystal.h>
#include <Keypad.h>
#define BUTTON  2    
#define RELAY   3    
int buttonState = 0;   



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);  

char customKey;
int buzzer = 10;


LiquidCrystal lcd(12, 11, 17, 16, 15, 14);


void buzer(){
        tone(10, 500); // Play tone at 1000 Hz
        delay(262);
        tone(10, 500); // Play tone at 2000 Hz
        delay(262);
             if (customKey);  // Check if a key was pressed
}

void keybaed() {
    customKey = customKeypad.getKey();


    if (customKey) {
       
       LCD(customKey);
       
        Serial.print("Pressed Key: ");
        Serial.println(customKey);
    }
}

void relay(){
buttonState = digitalRead(BUTTON);

  if (buttonState == HIGH) {
   
    digitalWrite(RELAY, HIGH);
  } else {
  
    digitalWrite(RELAY, LOW);
  }
}

void LCD(char num){

lcd.print(num);
  delay(500);
  // lcd.clear();
  // delay(500);

}

void setup() {
  Serial.begin(9600);
  Serial.println(); 
  pinMode(RELAY, OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP);
  pinMode(buzzer, OUTPUT);
   lcd.begin(16, 2);

}

void loop() {

   relay();

 //LCD();

  keybaed(); 

buzer();

}