#include <ArduinoJson.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include <Keypad.h>

// for tft screen connection 

#define TFT_DC 2
#define TFT_CS 15

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

#define BLUE      0x001F
#define TEAL      0x0438
#define GREEN     0x07E0
#define CYAN      0x07FF
#define RED       0xF800
#define MAGENTA   0xF81F
#define YELLOW    0xFFE0
#define ORANGE    0xFC00
#define PINK      0xF81F
#define PURPLE    0x8010
#define GREY      0xC618
#define WHITE     0xFFFF
#define BLACK     0x0000



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

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

byte rowPins [ROWS] = {16, 17, 5, 21};
byte colPins [COLS] = {12, 14, 27, 26};

Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);


void setup() {

  Serial.begin(115200);

   tft.begin(); // setting the screen 
  tft.fillScreen(WHITE);
  tft.setRotation(0);
}

  void loop (){
// Get key value if pressed
  char customKey = customKeypad.getKey();
 
  if (customKey) {
    // Print key value to serial monitor
    Serial.println(customKey);
    tft.fillScreen(WHITE);
    tft.setCursor(120, 125);
    tft.setTextColor(RED);
    tft.setTextSize(2);
    tft.print(customKey);
  }
  }