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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
RTC_DS1307 RTC;
char days[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup() {
  Serial.begin(115200);
  if(!RTC.begin()){
    Serial.println("Couldn't find RTC");
    while(1);
  }
  RTC.adjust(DateTime(F(__DATE__),F(__TIME__)));

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)){
    Serial.println(F("SSD1306 Failed"));
    for(;;);
  }
  delay(1000);
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(30,20);
  display.println("RTC");
  display.display();
  delay(3000);
  display.clearDisplay();
}

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

  display.clearDisplay();
  display.setTextSize(2);
  display.setCursor(0,0);
  display.print(now.day());
  display.print('/');
  display.print(now.month());
  display.print('/');
  display.print(now.year());
  display.println(days[now.dayOfTheWeek()]);
  display.println(' ');

  display.setCursor(0,40);
  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.print(now.second());

  display.display();
}