//Panos Papazoglou, MICRODEV.GR
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 
#define OLED_DC     8
#define OLED_CS     10
#define OLED_RESET  9
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT,
  &SPI, OLED_DC, OLED_RESET, OLED_CS);

void setup() 
{
  Serial.begin(9600);
 
  if(!oled.begin(SSD1306_SWITCHCAPVCC)) {
    Serial.println(F("SSD1306 Error"));
    for(;;);
  }
oled.clearDisplay();
oled.display();

for(int rad=1;rad<35;rad+=5)
{
  oled.drawCircle(63, 31, rad, WHITE);
  oled.display();
}
}

void loop() {
}