#include "RTClib.h"
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


RTC_DS1307 rtc; //create an instant of RTC

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}; //create a matrix for displaying the date

void setup () {
  Serial.begin(115200);

//check rtc connection
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
  }

  rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(2);
}


void loop () {
  DateTime now = rtc.now();
  display.clearDisplay();
  
  display.setCursor(0, 0);
  if (now.hour() < 10)
    display.print('0');
  display.print(now.hour());
  display.print(':');
  if (now.minute() < 10)
    display.print('0');
  display.print(now.minute());
  display.print(':');
  if (now.second() < 10)
    display.print('0');
  display.println(now.second());

  display.setCursor(0, 25);
  display.println(daysOfTheWeek[now.dayOfTheWeek()]);

  display.setCursor(0, 50);
  display.print(now.day());
  display.print('/');
  display.print(now.month());
  display.print('/');
  display.println(now.year()); 
  
  display.display();
}