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

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(0x27, 20, 4);



const uint8_t ROWS = 4;
const uint8_t COLS = 3;
char keys[ROWS][COLS] = {
  { '1', '2', '3',},
  { '4', '5', '6',},
  { '7', '8', '9',},
  { '*', '0', '#',}
};

uint8_t colPins[COLS] = { 4, 2, 6 }; // Pins connected to C1, C2, C3, 
uint8_t rowPins[ROWS] = { 3 ,8 ,7 ,5 }; // Pins connected to R1, R2, R3, R4
 
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);


void setup() {
  // Init
  lcd.init();
  lcd.backlight();
Serial.begin(9600);
  
 

}


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

  if (key != NO_KEY) {
    Serial.println(key);
  }
    lcd.setCursor(3, 0);
  lcd.print(key);
  lcd.clear();
 
}