#include <Keypad.h>


const Byte ROWS = 4;
const Byte COLS = 4;

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

byte rowPins[ROWS] = {19,18,5,17}; //R1,R2,R3,R4
byte colPins[COLS] = {16,4,2,15}; //C1,C2,C3,C4

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

void setup() {
  
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  car key = k.getKey();
  if(key){
    Serial.println(key);
  }
  
}