/*************************************************************************************************
                                      PROGRAMMINFO
**************************************************************************************************
  Funktion: NANO RTC OLED-Display

**************************************************************************************************
  Version: 18.02.2023
**************************************************************************************************
  Board: NANO
**************************************************************************************************
  Libraries:
  https://github.com/espressif/arduino-esp32/tree/master/libraries
  C:\Users\User\Documents\Arduino
  D:\gittemp\Arduino II\A156_Wetterdaten_V3
**************************************************************************************************
  C++ Arduino IDE V1.8.19

**************************************************************************************************
  Einstellungen:
  https://dl.espressif.com/dl/package_esp32_index.json
  http://dan.drown.org/stm32duino/package_STM32duino_index.json
  http://arduino.esp8266.com/stable/package_esp8266com_index.json
**************************************************************************************************/
#include <Arduino.h>
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);


unsigned long delayTime;



#include <Wire.h>
#include "RTClib.h"
RTC_DS3231 rtc;
char daysOfTheWeek[7][12] = {
  "Sonntag",
  "Montag",
  "Dienstag",
  "Mittwoch",
  "Donnerstag",
  "Freitag",
  "Samstag"
};
void setup () {
  Serial.begin(115200);

  u8g2.begin();

  rtc.begin();
  rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  /* To manualy set date and time,
    remove the coment // signs
    and enter new values in the followingline
    in this sequence: year, day, month, hour, minute and second.*/
  //rtc.adjust(DateTime(2020, 2, 24, 10, 00, 0));
}


void loop () {
  DateTime now = rtc.now();
  //Day of the week
  Serial.print("Wochentag: ");
  Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
  Serial.println();
  //one tab
  //Current time:
  Serial.print("Uhrzeit: ");
  if (now.hour() < 10) {
    Serial.print("0");
    Serial.print(now.hour());
  }
  else {
    Serial.print(now.hour(), DEC);
  }
  Serial.print(':');
  if (now.minute() < 10) {
    Serial.print("0");
    Serial.print(now.minute());
  }
  else {
    Serial.print(now.minute(), DEC);
  }
  Serial.print(':');
  if (now.second() < 10) {
    Serial.print("0");
    Serial.print(now.second());
  }
  else {
    Serial.print(now.second(), DEC);
  }
  Serial.println();
  //one tab
  //Current date:
  Serial.print("Datum: ");
  if (now.day() < 10) {
    Serial.print("0");
    Serial.print(now.day());
  }
  else {
    Serial.print(now.day(), DEC);
  }
  Serial.print('.');
  if (now.month() < 10) {
    Serial.print("0");
    Serial.print(now.month());
  }
  else {
    Serial.print(now.month(), DEC);
  }
  Serial.print('.');
  Serial.print(now.year(), DEC);
  Serial.print("");
  Serial.println();
  //Temperature:
  Serial.print("Temperatur: ");
  Serial.print(rtc.getTemperature());
  Serial.println(" °C");
  Serial.println();
  delay(2000);





//**** OLED-DISPLAY *********************


  u8g2.setFont(u8g2_font_courR10_tf);
  u8g2.firstPage();

  do {

    u8g2.setCursor(33, 10);
    u8g2.print(daysOfTheWeek[now.dayOfTheWeek()]);

        //Datum
    u8g2.setCursor(20, 27);
  if (now.day() < 10) {
    u8g2.print("0");
    u8g2.print(now.day());
  }
  else {
    u8g2.print(now.day(), DEC);
  }
  u8g2.print('.');
  if (now.month() < 10) {
    u8g2.print("0");
    u8g2.print(now.month());
  }
  else {
    u8g2.print(now.month(), DEC);
  }
  u8g2.print('.');
  u8g2.print(now.year(), DEC);

//Uhrzeit
    u8g2.setCursor(30, 45);
  if (now.hour() < 10) {
    u8g2.print("0");
    u8g2.print(now.hour());
  }
  else {
    u8g2.print(now.hour(), DEC);
  }
  u8g2.print(':');
  if (now.minute() < 10) {
    u8g2.print("0");
    u8g2.print(now.minute());
  }
  else {
    u8g2.print(now.minute(), DEC);
  }
  u8g2.print(':');
  if (now.second() < 10) {
    u8g2.print("0");
    u8g2.print(now.second());
  }
  else {
    u8g2.print(now.second(), DEC);
  }


//Temperatur

    u8g2.setCursor(35, 63);
    u8g2.print(rtc.getTemperature());

    u8g2.print("\xB0""C");

  } while ( u8g2.nextPage() );
  delay(delayTime);

}