#include <Keypad.h>
const byte rows = 4; //four rows
const byte cols = 4; //three columns
char keys[rows][cols] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[rows] = {9,8,7,6}; //connect to the row pinouts of the keypad
byte colPins[cols] = {5,4,3,2}; //connect to the column pinouts of the keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, rows, cols );
String intendedKeyCode = "";
int num = 0;
char key;
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C x(0x27,16,2);
void setup() {
 x.init();
x.backlight(); 
 x.clear();
  pinMode(12, OUTPUT);
}

void loop() {
 key = keypad.getKey();
  if(key != NO_KEY)
  {

   x.setCursor(5,0);
   x.print( key);
  delay(500);
  if(key=='2')
   digitalWrite(12,1);
 else digitalWrite(12,0);
}}