#include <Wire.h>
#include <DS3231.h>


#define LED_1 13 // LED pins
#define LED_2 12
#define LED_3 11
#define LED_4 10

#define BUZ 3 // The speaker enable

#define POT A0 // The analog input for the potentiometer

#define S_1 A1 // The input pushbuttons
#define S_2 A2
#define S_3 A3

#define D_LATCH 4 // The 3 pins that control the display
#define D_CLK 7
#define D_DATA 8

DS3231 rtc;
RTCDateTime dt;

const byte numMap[] = {0x03, 0x9F, 0x25, 0x0D, 0x99, 0x49, 0x41, 0x1F, 0x01, 0x09, 0x11, 0xC1, 0x63, 0x85, 0x61, 0x71, 0xFF};
const byte digitMap[] = {0x00, 0x80, 0x40, 0x20, 0x10};

int dig1, dig2, dig3, dig4;

void dispNum(int digitNum, int Value) {
  digitalWrite(D_LATCH, LOW);
  shiftOut(D_DATA, D_CLK, LSBFIRST, numMap[Value]);
  shiftOut(D_DATA, D_CLK, LSBFIRST, digitMap[digitNum] );
  digitalWrite(D_LATCH, HIGH);
}


void setup() {
	//Leds
	pinMode(LED_1, OUTPUT);
	digitalWrite(LED_1, HIGH);
	pinMode(LED_2, OUTPUT);
	digitalWrite(LED_2, HIGH);
	pinMode(LED_3, OUTPUT);
	digitalWrite(LED_3, HIGH);
	pinMode(LED_4, OUTPUT);
	digitalWrite(LED_4, HIGH);
	
	//Drukknoppen
	pinMode(S_1, INPUT);
	pinMode(S_2, INPUT);
	pinMode(S_3, INPUT);
	
	//Buzzer
	pinMode(BUZ, OUTPUT);
	digitalWrite(BUZ, HIGH);
	
	//Display
	pinMode(D_LATCH , OUTPUT);
	pinMode(D_CLK , OUTPUT);
	pinMode(D_DATA , OUTPUT);
	dispNum(1, 16);
	dispNum(2, 16);
	dispNum(3, 16);
	dispNum(4, 16);
	dispNum(0, 16);
	
	Wire.begin();
	rtc.begin();
 }


void loop() {
	dt = rtc.getDateTime();
	int year, month, day, hour, minute,second;
  
  if(!digitalRead(S_1)) {
    dig1 = dt.month / 10;
    dispNum(1 , dig1);
    dig2 = dt.month - (dig1 * 10);
    dispNum(2 , dig2);
    dig3 = dt.day / 10;
    dispNum(3 , dig3);
    dig4 = dt.day - (dig3 * 10);
    dispNum(4 , dig4);
  }
  else if(!digitalRead(S_2)) {
    dig1 = 16;
    dispNum(1 , dig1);
    dig2 = 16;
    dispNum(2 , dig2);
    dig3 = dt.second / 10;
    dispNum(3 , dig3);
    dig4 = dt.second - (dig3 * 10);
    dispNum(4 , dig4);
  }
  else {
    dig1 = dt.hour / 10;
    dispNum(1 , dig1);
    dig2 = dt.hour - (dig1 * 10);
    dispNum(2 , dig2);
    dig3 = dt.minute / 10;
    dispNum(3 , dig3);
    dig4 = dt.minute - (dig3 * 10);
    dispNum(4 , dig4);
  }
}