#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {
  pinMode(25, OUTPUT);
  pinMode(27, OUTPUT);
  Serial.begin(9500);
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)){
    Serial.println(F("SSD1306 allocation Failed"));
    for(;;);
  }
}

void loop() {
  delay(1000);
  display.clearDisplay();
  display.setCursor(0, 0);
  display.fillCircle(64, 32, 15, WHITE);
  display.fillCircle(64, 32, 10, BLACK);
  display.display();
}