#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Keypad.h>
#define LEBAR_LAYAR 128
#define TINGGI_LAYAR 64
Adafruit_SSD1306 oled(LEBAR_LAYAR, TINGGI_LAYAR, &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'}
};
uint8_t colPins[KOLOM]={15,2,4,16};
uint8_t rowPins[BARIS]={17,5,18,19};
Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, BARIS, KOLOM);
void setup() {
  Serial.begin(9600);
    if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }
  delay(2000);         
  oled.clearDisplay(); 
  oled.setTextSize(1);
  oled.setTextColor(WHITE);
  oled.setCursor(0, 10);
  oled.println("Keypad ESP32");
  delay(2000);
  oled.display(); 
  oled.clearDisplay();// menampilkan display OLED
}
void loop() {
  char customKey = customKeypad.getKey();
    if (customKey){
    oled.setTextSize(3);
    oled.setTextColor(WHITE); 
    oled.setCursor(1,10);
    oled.print("Press: ");
    oled.print(customKey);
    oled.display();
    oled.clearDisplay(); 
    delay(100);
  }
}