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

RTC_DS3231 rtc;

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 15, /* data=*/ 4, /* reset=*/ U8X8_PIN_NONE);

void setup() {
  Serial.begin(9600);
  Wire.begin();
  
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, let's set the time!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  u8g2.begin();
  u8g2.setFont(u8g2_font_ncenB08_tr); // Choose a font
}

void loop() {
  DateTime now = rtc.now();

  u8g2.clearBuffer();
  u8g2.setCursor(0, 10);

  // Anzeige von Stunden, Minuten und Sekunden
  u8g2.print("Time: ");
  if (now.hour() < 10) u8g2.print("0");
  u8g2.print(now.hour(), DEC);
  u8g2.print(':');
  if (now.minute() < 10) u8g2.print("0");
  u8g2.print(now.minute(), DEC);
  u8g2.print(':');
  if (now.second() < 10) u8g2.print("0");
  u8g2.print(now.second(), DEC);

  u8g2.sendBuffer();
  delay(1000);
}