/*
 * This ESP32 code is created by esp32io.com
 *
 * This ESP32 code is released in the public domain
 *
 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-oled
 */

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

#define SCREEN_WIDTH 128 // OLED width,  in pixels
#define SCREEN_HEIGHT 64 // OLED height, in pixels
#define SCREEN_ADDR 0x3C // I2C address of screen

// create an OLED display object connected to I2C
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(115200);

  // initialize OLED display with I2C
  if (!oled.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDR)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  //delay(2000);         // wait two seconds for initializing
  oled.clearDisplay(); // clear display

  oled.setTextSize(1);         // set text size
  oled.setTextColor(WHITE);    // set text color
}

void loop() {
  oled.clearDisplay(); // clear display
  oled.setCursor(0, 10);       // set position to display
  oled.println("Hello, world!"); // set text
  oled.display();              // display on OLED
  delay(1000);
  
  oled.clearDisplay(); // clear display
  oled.setCursor(0, 10);       // set position to display
  oled.println("world, Hello!"); // set text
  oled.display();              // display on OLED
  delay(1000);
}