#include <WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>

#include <Arduino.h>
#include <U8g2lib.h>

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

const char *ssid     = "xxx";
const char *password = "xxx";
WiFiUDP ntpUDP;


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

const long utcOffsetInSeconds = 3600;


char daysOfTheWeek[7][12] = {"Sonntag", "Montag", "Dienstag", "Mittwoch", "Donnerstag", "Freitag", "Samstag"};
String formTime;

NTPClient timeClient(ntpUDP, "ptbtime1.ptb.de", utcOffsetInSeconds);

void setup(void) {
  u8g2.begin();
  WiFi.begin(ssid, password);
  timeClient.begin();
}




void loop(void) {
  u8g2.clearBuffer();					// clear the internal memory
  u8g2.setFont(u8g2_font_ncenB08_tr);	// choose a suitable font
  u8g2.drawStr(0,10,"Hello World!");	// write something to the internal memory
  u8g2.sendBuffer();					// transfer internal memory to the display
  delay(5000);
  
  timeClient.update();
   formTime = ((timeClient.getFormattedTime())+ " "+(daysOfTheWeek[timeClient.getDay()]));
      
   char formTime_2[50];

   formTime.toCharArray(formTime_2, 50);
    
   u8g2.clearBuffer();
   u8g2.drawStr(0,40,(formTime_2));
   u8g2.sendBuffer();
 
  delay(20000);
}