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

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
int i;

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

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
 
}

void loop() {
  // Draw rectangle
  display.clearDisplay();
  display.drawRect(40, 16, 10, 10, WHITE);
  display.display();
  delay(3000);
  // Fill rectangle
  display.fillRect(40, 16, 10, 10, WHITE);
  display.display();
  delay(3000);

    
 
}