#include <Keypad.h>
#include <LiquidCrystal_I2C.h>


const int ROWS = 4;
const int COLS = 3;
char keys[ROWS][COLS] = {
  { '1', '2', '3' },
  { '4', '5', '6' },
  { '7', '8', '9' },
  { '*', '0', '#' }
};

uint8_t colPins[COLS] = { 5, 4, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 22, 21, 19, 18 }; // Pins connected to R1, R2, R3, R4

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


void setup() {
  Serial.begin(9600);
   
}

void loop() {
  char key = keypad.getKey();
  Serial.println(key);
  delay(500);
  
}