#include <Wire.h>//I2C stuff
#include <Adafruit_SSD1306.h>//oled oled stuff
#include <Adafruit_GFX.h>//Draw stuff on oled


Adafruit_SSD1306 oled(128, 64, &Wire, -1);//Declare oled type, size, connection and that it has no reset pin.

char message[] = "Oled roulette: Pressing the reset button may or may not crash the display";//Text to scroll
int x, minX;//Store position and length of text

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

  oled.begin(SSD1306_SWITCHCAPVCC, 0x3C);//Start oled on I2C

  x = oled.width();//Sets to 128 pixels width
  minX = -18 * strlen(message);//18 = 6 pixels/character * text size 3

}

void loop() {

  oled.clearDisplay();//Clear buffer and screen
  oled.setTextColor(SSD1306_WHITE);//Use white pixels
  oled.setTextSize(3);//Set 3 times normal text size
  oled.setTextWrap(false);//Turn text wrapping off
  oled.setCursor(x, 16);//Position cursor
  oled.print(message);//Scrolling message
  oled.display();//Send the above to the display
  x = x - 3;//scroll speed, make more positive to slow down the scroll
  Serial.println(x);
  if (x < minX) x = oled.width();//If text length less than 128 pixels, use screen size as length to base scrolling maths on

}