// include the library code:
#include <Keypad.h>
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
const byte numRows = 4;
const byte numCols = 3;

char keymap[numRows][numCols]=
{
  {'1','2','3'},
  {'4','5','6'},
  {'7','8','9'},
  {'*','0','#'}
};

byte rowPins[numRows]={6,5,4,3};
byte colPins[numCols]={2,1,0};

Keypad myKeypad = Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("hello, world!");

  Serial.begin(9600);
}

void loop() {
  lcd.setCursor(0, 1);

  char keypressed = myKeypad.getKey();
  if(keypressed != NO_KEY)
  {
    Serial.print(keypressed);
  }
}