#include <Wire.h>
#include<Adafruit_GFX.h>
#include<Adafruit_SSD1306.h>
#include <Keypad.h>

#define llayar 128
#define tlayar 64


Adafruit_SSD1306 oled(llayar, tlayar, &Wire, -1);
const byte baris =4;
const byte kolom=4;

char hexaKeys[baris][kolom] ={

  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}

};
byte rowPins[baris]={14,12,19,18};
byte colPins[kolom]={5,4,2,15};
Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, baris, kolom);


void setup() {
  Serial.begin(9600);

// intialize ioled display with i2c address 0x3c//
  if(!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  delay(2000);
  oled.clearDisplay();

oled.setTextSize(1); //atur ukuran text
oled.setTextColor(WHITE); //atur warna text
oled.setCursor(0,10); //atur posisi text pd display
oled.println("ESP32 Keypad dengan OLED");
delay(2000);
oled.display();
oled.clearDisplay(); //menampilkan display oled
}

void loop() {
  char customKey= customKeypad.getKey();
  if(customKey){

oled.clearDisplay();
oled.setTextSize(1);
oled.setTextColor(WHITE);
oled.setCursor(0,10);
oled.print("Press: ") ;
oled.print(customKey);
oled.display();

delay(100);

  }
}