#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.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] = {9, 8, 7, 6}; 
byte colPins[COLS] = {5, 4, 3, 2}; 

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

LiquidCrystal_I2C lcd(0x27, 16, 2); 

void setup() {
  Wire.begin();
  lcd.init(); 
  lcd.backlight(); 
  lcd.print("Enter ASCII:");
}

void loop() {
  String inputAscii = ""; 
  
  while (inputAscii.length() < 3) {
    char key = keypad.getKey(); 
    if (key) { 
      inputAscii += key; 
      lcd.setCursor(0, 1); 
      lcd.print("ASCII: ");
      lcd.print(inputAscii); 
    }
  }
  
  char ch = asciiToChar(inputAscii); 
  
  lcd.clear(); 
  lcd.setCursor(0, 0); 
  lcd.print("ASCII: ");
  lcd.print(inputAscii);
  lcd.setCursor(0, 1); 
  lcd.print("Char: ");
  lcd.print(ch);
  
  delay(2000); 
  lcd.clear(); 
  lcd.print("Enter ASCII:"); 
}

char asciiToChar(String asciiValue) {
  return char(atoi(asciiValue.c_str())); 
}