#include "RTClib.h"
#include <U8g2lib.h>

RTC_DS1307 rtc;
U8X8_SSD1306_128X64_NONAME_HW_I2C display(U8X8_PIN_NONE);
#define SCREEN_WIDTH        128 // OLED display width, in pixels
#define SCREEN_HEIGHT        64 // OLED display height, in pixels


void setup() {
  Serial.begin(9600);
  rtc.begin();
  display.begin();
  display.setPowerSave(0);
  display.setFont(u8x8_font_pxplusibmcgathin_f);

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }

}

void loop() {

  DateTime now = rtc.now();
  display.clear();
  display.print(now.hour());
  display.print(':');
  display.print(now.minute());
  display.print(':');
  display.print(now.second());
  display.println();
  display.flush();

  delay(1000);

}