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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1          //Define the reset pin of the OLED as same as the reset pin of the ESP32.
#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  // Initialize seriel monitor and OLED display.
  Serial.begin(115200);
  if (! display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS))           // Here we check, was the display initialize successfully?      "!" symbol works as logical not operation.
  {                                                                      
    Serial.println(F("SSD1306 allocation failed"));                      // If the display was not initialize successfully, above ! statement will become true and this line will be print.
    for (;;);                                                           // This is an infinitely executing for loop without any inputs.   the code will not be run beyond this for loop if the display is not working.
  }

  // Turn o OLED display.
  display.display();
  delay(2000);

  // Clear OLED display.
  display.clearDisplay();

  // Display a custom message.
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println(F("Welcome to Medibox !"));
  display.display();

}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}