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

const byte ROWS = 4;
const byte COLS = 4;

char Keys[ROWS][COLS] = 
{
   {'1', '2', '3', 'A'},
   {'4', '5', '6', 'B'},
   {'7', '8', '9', 'C'},
   {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {5, 17, 16, 4};
byte colPins[COLS] = {0, 2, 15, 13};

LiquidCrystal_I2C lcd(0x27, 16, 2); 

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

void setup() {
   Serial.begin(9600);
   keypad.setDebounceTime(50); 

   pinMode(19, OUTPUT);
   pinMode(21, OUTPUT);
   pinMode(12, OUTPUT);
   pinMode(14, OUTPUT);

   lcd.init(); 
   lcd.backlight(); 
   lcd.clear(); 
   
}

void loop() {
   char key = keypad.getKey();
   if (key != NO_KEY) {
     Serial.println(key);
     lcd.clear(); 
     lcd.print("Key: "); 
     lcd.print(key); 
     switch (key) {
         case '1': {
           digitalWrite(19, HIGH);
           digitalWrite(21, LOW);
           digitalWrite(12, LOW);
           digitalWrite(14, LOW);
           delay(500);
           break;
         }
         case '2': {
           digitalWrite(19, LOW);
           digitalWrite(21, HIGH);
           digitalWrite(12, LOW);
           digitalWrite(14, LOW);
           delay(500);
           break;
         }
         case '3': {
           digitalWrite(19, HIGH);
           digitalWrite(21, HIGH);
           digitalWrite(12, LOW);
           digitalWrite(14, LOW);
           delay(500);
           break;
         }
         case '4': {
           digitalWrite(19, LOW);
           digitalWrite(21, LOW);
           digitalWrite(12, HIGH);
           digitalWrite(14, LOW);
           delay(500);
           break;
         }
         case '5': {
           digitalWrite(19, HIGH);
           digitalWrite(21, LOW);
           digitalWrite(12, HIGH);
           digitalWrite(14, LOW);
           delay(500);
           break;
         }
         case '6': {
           digitalWrite(19, LOW);
           digitalWrite(21, HIGH);
           digitalWrite(12, HIGH);
           digitalWrite(14, LOW);
           delay(500);
           break;
         }
         case '7': {
           digitalWrite(19, HIGH);
           digitalWrite(21, HIGH);
           digitalWrite(12, HIGH);
           digitalWrite(14, LOW);
           delay(500);
           break;
         }
         case '8': {
           digitalWrite(19, LOW);
           digitalWrite(21, LOW);
           digitalWrite(12, LOW);
           digitalWrite(14, HIGH);
           delay(500);
           break;
         }
         case '9': {
           digitalWrite(19, HIGH);
           digitalWrite(21, LOW);
           digitalWrite(12, LOW);
           digitalWrite(14, HIGH);
           delay(500);
           break;
         }
         case '0': {
           digitalWrite(19, LOW);
           digitalWrite(21, HIGH);
           digitalWrite(12, LOW);
           digitalWrite(14, HIGH);
           delay(500);
           break;
         }
         case 'A': {
           digitalWrite(19, HIGH);
           digitalWrite(21, HIGH);
           digitalWrite(12, LOW);
           digitalWrite(14, HIGH);
           delay(500);
           break;
         }
         case 'B': {
           digitalWrite(19, LOW);
           digitalWrite(21, LOW);
           digitalWrite(12, HIGH);
           digitalWrite(14, HIGH);
           delay(500);
           break;
         }
         case 'C': {
           digitalWrite(19, HIGH);
           digitalWrite(21, LOW);
           digitalWrite(12, HIGH);
           digitalWrite(14, HIGH);
           delay(500);
           break;
         }
         case 'D': {
           digitalWrite(19, LOW);
           digitalWrite(21, HIGH);
           digitalWrite(12, HIGH);
           digitalWrite(14, HIGH);
           delay(500);
           break;
         }
         case '#': {
           digitalWrite(19, HIGH);
           digitalWrite(21, HIGH);
           digitalWrite(12, HIGH);
           digitalWrite(14, HIGH);
           delay(500);
           break;
         }
         case '*': {
           digitalWrite(19, LOW);
           digitalWrite(21, LOW);
           digitalWrite(12, LOW);
           digitalWrite(14, LOW);
           delay(500);
           break;
         }
     }
   }
}