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

LiquidCrystal_I2C lcd(0x27, 16, 4);


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] = {12, 26, 14, 17};
byte colPins[COLS] = {13, 2, 4,19};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

byte ledPin = 13;
boolean blink = false;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  keypad.addEventListener(keypadEvent);  // Add an event listener.
  keypad.setHoldTime(500);               // Default is 1000mS
  keypad.setDebounceTime(250);           // Default is 50mS


  Serial.println("Hello, ESP32!");
  lcdInit();
}

void loop() {
  
  char kye2 = keypad.getKey();
  if(kye2!=NO_KEY){
  Serial.println(kye2);
  lcd.print(kye2);
  }
  
  delay(10); // this speeds up the simulation
}

void lcdInit(){
  lcd.init();
  lcd.clear();
  lcd.backlight();
  cr();
  lcd.print("Baslatiliyor");
  cargando();
  cr();
  lcd.clear();
}

void cargando(){
  for(int i=0; i<4; i++){
    lcd.print(".");
    delay(200);
  }
}

void cr(){
  lcd.setCursor(0, 0);
}

//take care of some special events
void keypadEvent(KeypadEvent key){
  switch (keypad.getState()){
    case PRESSED:
      switch (key){
        case '#': digitalWrite(ledPin,!digitalRead(ledPin)); break;
        case '*': digitalWrite(ledPin,!digitalRead(ledPin)); break;
      }
    break;
    case RELEASED:
      switch (key){
        case '*':
          digitalWrite(ledPin,!digitalRead(ledPin));
          blink = false;
        break;
      }
    break;
    case HOLD:
      switch (key){
        case '*': blink = true; break;
      }
    break;
  }
}