#include <Keypad.h>
#include <LiquidCrystal.h>
#include <iostream>
LiquidCrystal lcd(23,22,21,19,18,5,17,16,4,0,2);
int y = 0;
int i = 0;
const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 25, 33, 32, 13 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 12, 14, 27, 26 }; // Pins connected to R1, R2, R3, R4

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

void setup() {
  lcd.begin(16, 2);
  Serial.begin(115200);
}

void loop() {
  
  char key = keypad.getKey();
  if (key != NO_KEY) {
    if (key == 'C' ){
      lcd.clear();
    }else{
      lcd.print(key);
    }
  }
}