#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH  128
#define SCREEN_HEIGHT  64
#define OLED_RESET      4
#define OLED_ADDRESS 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(115200);
  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDRESS);
  display.clearDisplay();
  display.display();
}

void loop() {
  pattern1();
  delay(2000);
  pattern2();
  delay(2000);
  pattern3();
  delay(2000);
}

void pattern1() {
  for (byte j = 0; j < SCREEN_HEIGHT; j++) {
    for (byte i = 0; i < SCREEN_WIDTH; i++) {
      if (j % 2) {
        if (i % 2)
          display.drawPixel(i, j, 1);
        else
          display.drawPixel(i, j, 0);
      } else {
        if (i % 2)
          display.drawPixel(i, j, 0);
        else
          display.drawPixel(i, j, 1);
      }
    }
  }
  display.display();
}

void pattern2() {
  for (byte j = 0; j < SCREEN_HEIGHT; j++) {
    for (byte i = 0; i < SCREEN_WIDTH; i++) {
      if ((j % 2) && (i % 2))
        display.drawPixel(i, j, 1);
      else
        display.drawPixel(i, j, 0);
    }
  }
  display.display();
}

void pattern3() {
  for (byte j = 0; j < SCREEN_HEIGHT; j++) {
    for (byte i = 0; i < SCREEN_WIDTH; i++) {
      if ((j % 2) || (i % 2))
        display.drawPixel(i, j, 1);
      else
        display.drawPixel(i, j, 0);
    }
  }
  display.display();
}