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#include <SPI.h>
#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

// Declaration for SSD1306 display connected using I2C
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Declaration for SSD1306 display connected using software SPI:
//#define OLED_MOSI   9
//#define OLED_CLK   10
//#define OLED_DC    11
//#define OLED_CS    12
//#define OLED_RESET 13
//Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

void setup()
{
  Serial.begin(9600);
  
  // initialize the OLED object
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  // Uncomment this if you are using SPI
  //if(!display.begin(SSD1306_SWITCHCAPVCC)) {
  //  Serial.println(F("SSD1306 allocation failed"));
  //  for(;;); // Don't proceed, loop forever
  //}

  // Clear the buffer.
  display.clearDisplay();

  // Display Text
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,28);
  display.println("Hello world!");
  display.display();
  delay(2000);
  display.clearDisplay();

  // Display Inverted Text
  display.setTextColor(BLACK, WHITE); // 'inverted' text
  display.setCursor(0,28);
  display.println("Hello world!");
  display.display();
  delay(2000);
  display.clearDisplay();

  // Changing Font Size
  display.setTextColor(WHITE);
  display.setCursor(0,24);
  display.setTextSize(2);
  display.println("Hello!");
  display.display();
  delay(2000);
  display.clearDisplay();

  // Display Numbers
  display.setTextSize(1);
  display.setCursor(0,28);
  display.println(123456789);
  display.display();
  delay(2000);
  display.clearDisplay();

  // Specifying Base For Numbers
  display.setCursor(0,28);
  display.print("0x"); display.print(0xFF, HEX); 
  display.print("(HEX) = ");
  display.print(0xFF, DEC);
  display.println("(DEC)"); 
  display.display();
  delay(2000);
  display.clearDisplay();

  // Display ASCII Characters
  display.setCursor(0,24);
  display.setTextSize(2);
  display.write(3);
  display.display();
  delay(2000);
  display.clearDisplay();

  // Scroll full screen
  display.setCursor(0,0);
  display.setTextSize(1);
  display.println("Full");
  display.println("screen");
  display.println("scrolling!");
  display.display();
  display.startscrollright(0x00, 0x07);
  delay(2000);
  display.stopscroll();
  delay(1000);
  display.startscrollleft(0x00, 0x07);
  delay(2000);
  display.stopscroll();
  delay(1000);    
  display.startscrolldiagright(0x00, 0x07);
  delay(2000);
  display.startscrolldiagleft(0x00, 0x07);
  delay(2000);
  display.stopscroll();
  display.clearDisplay();

  // Scroll part of the screen
  display.setCursor(0,0);
  display.setTextSize(1);
  display.println("Scroll");
  display.println("some part");
  display.println("of the screen.");
  display.display();
  display.startscrollright(0x00, 0x00);
}

void loop() {
}