//Include librarys
#include "SevSeg.h"
#include "RTClib.h"
//Sets up librarys
RTC_DS1307 rtc;
SevSeg sevseg;
//Colon blink pin
const int CLN =  13;
//Saves the mode of the colon
int CLNState = LOW;
//Variables for the blinking code
unsigned long previousMillis = 0;
const long interval = 500;
//void setup
void setup() {
  //Colon pin output
  pinMode(CLN, OUTPUT);
  //change colon pinstate
  digitalWrite(CLN, CLNState);
  //Display date
  byte numDigits = 4;
  byte digitPins[] = {2, 3, 4, 5};
  byte segmentPins[] = {6, 7, 8, 9, 10, 11, 12,};
  bool resistorsOnSegments = false;
  byte hardwareConfig = COMMON_ANODE;
  bool updateWithDelays = false;
  bool leadingZeros = false;
  bool disableDecPoint = false;
  //Enters display data
  sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments,
  updateWithDelays, leadingZeros, disableDecPoint);
  sevseg.setBrightness(90);
  //Checks for the RTC
    if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }
}
//void loop
void loop() {
  //Checks current time
  DateTime now = rtc.now();
  //Converts time to an int
  int time = now.hour() * 100 + now.minute();
  //Checks if the time is higher than 12 so the last number goes on and of acordingly
  if(time > 999){
    sevseg.setNumber(time, 3);
  }
  else{
    sevseg.setNumber(time, 2);
  }
  //Refresh the display
  sevseg.refreshDisplay();
  //variable for the blinking
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {//Delays the change
    previousMillis = currentMillis;//Reset the counter
    if (CLNState == LOW)
    {
      CLNState = HIGH;//Change the state to HIGH if its LOW
    } else 
    {
      CLNState = LOW;//Change the state to LOW if its HIGH
    }
    digitalWrite(CLN, CLNState);//Changes the colon for real
  }
}
//nice
/*
This is just a normal digital clock.
It turns the hour digit of if the hour isn´t a double digit.
It keeps the time if the battery runs out but the display turns off.
If you add a new battery it will still have the time and you won´t have to set the time again.
*/