#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 32 // OLED display height, in pixels
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)

// On an arduino UNO:       A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

int x,minx;
uint32_t j=0xd49d11;  // RGB888
int txtsize=2;  // Set text size
int sclspeed=2; // Set scroll speed
char text[20];

int RGB565(uint32_t rgb)
{
  int rgb16;
  rgb16=(((rgb&0xF80000)>>8) + ((rgb&0xFC00)>>5) + ((rgb&0xF8)>>3));
  return rgb16;
}
 
void setup()   
{ 
itoa (RGB565(j),text,16);             
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  //0x3C for 128x32, 0x3D for 128x64 
display.setTextSize(txtsize);
display.setTextColor(WHITE);
display.setTextWrap(false);
x=display.width();
minx=-6*txtsize*strlen(text);  //6 = Number of pixels per each character
}

void loop()
{
display.clearDisplay();
display.setCursor(x,0);  // It is recommended that the numbers be multiples of 8
display.print(text);
display.display();
x=x-sclspeed;
if(x<minx)
x=display.width();
}