arduino_oled

http://arduino-diy.com/arduino-oled-displey
oled -> leonardo
GND -> GND
VDD -> 3.3V
SCK -> D3
SDA -> D2


get i2c port
http://playground.arduino.cc/Main/I2cScanner

tutorial
http://www.instructables.com/id/Monochrome-096-i2c-OLED-display-with-arduino-SSD13/

library
http://arduino-project.net/biblioteki-oled-i2c-ozoled-u8glib/
http://www.rinkydinkelectronics.com/resource/OLED_I2C/OLED_I2C.pdf

source.ino

#include <OLED_I2C.h>
#define SHAPE_RECT_NUMBERS 4
#define RECT_SIZE 5
#define SCREE_HEIGHT 64

OLED  display(SDA, SCL, 8);

struct Position
{
  int x;
  int y;
};

Position positions[SHAPE_RECT_NUMBERS];

void setup()
{
  randomSeed(analogRead(0));
  setupRect();
  display.begin();
}

void loop()
{
  display.clrScr();
  drawFigure();
  // move figure
  int minY = positions[0].y;
  for (int i = 0; i < SHAPE_RECT_NUMBERS; ++i)
  {
    positions[i].y += 5;
    if (minY > positions[i].y) 
    {
      minY = positions[i].y;
    }
  } 

  if (random(10) < 3) {
    for (int i = 0; i < SHAPE_RECT_NUMBERS; ++i)
    {
      positions[i].x += 5;
    } 
  }

  if (minY >= SCREE_HEIGHT)
  {
    setupLine();
  }
  
  display.update();
  delay(500);
}

void drawFigure()
{
  drawRect(positions[0].x, positions[0].y);
  drawRect(positions[1].x, positions[1].y);
  drawRect(positions[2].x, positions[2].y);
  drawRect(positions[3].x, positions[3].y);
}

void setupLine()
{
  positions[0] = {0, 0};
  positions[1] = {5, 0};
  positions[2] = {10, 0};
  positions[3] = {15, 0};
}

void setupRect() 
{
  positions[0] = {0, 0};
  positions[1] = {0, 5};
  positions[2] = {5, 0};
  positions[3] = {5, 5};
}

void drawRect(int x, int y)
{
  display.drawRect(x, y, x + RECT_SIZE, y + RECT_SIZE);
  display.setPixel(x + 2, y + 2);
}