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

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET    -1 // Reset pin # (or -1 if sharing Arduino reset pin)

// create a display object called "oled"
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

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

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  // if starting the display doesn't work don't proceed
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // address 0x3C for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // don't proceed, loop forever
  }
  oled.setTextSize(2);      // 2:1 pixel scale
  // Draw white text on black background
  oled.setTextColor(SSD1306_WHITE, SSD1306_WHITE); 
  
  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  oled.display();
  delay(2000); // Pause for 2 seconds
  // Clear the buffer
  oled.clearDisplay();

  oled.setCursor(30, 10);     // x, y cursor position
  oled.print("Hello");
  oled.setCursor(30, 30);     // x, y cursor position
  oled.print("world!");
  
  oled.display();            // always need to use the display method after drawing
}

void loop() {
  // nothing to loop about
}