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

DS3231 RTC;

int second;
int minute;
int hour;
int date;
int month;
int year;
bool h12;
bool hPM;
bool century;

/*
Out Mux1 to 7 Segment
DP G F E D C B A DP G F  E  D  C  B  A
0  1 2 3 4 5 6 7 8  9 10 11 12 13 14 15

Out Mux2 to 7 Segment
A B C D E F G DP A B C  D  E  F  G  DP
0 1 2 3 4 5 6 7  8 9 10 11 12 13 14 15

7 Segment Pin to 7 Segment Digit
    ABCDEFGH
0 = 11111100
1 = 01100000
2 = 11011010
3 = 11110010
4 = 01100110
5 = 10110110
6 = 10111110
7 = 11100000
8 = 11111110
9 = 11110110

write multiple digit use %10  and  /10
*/

void setup() {
  Serial.begin(9600);
  Serial.println(".");Serial.println(".");Serial.println(".");
  Wire.begin();
  pinMode(3, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(2, OUTPUT);//A
  pinMode(4, OUTPUT);//B
  pinMode(9, OUTPUT);//C
  pinMode(10, OUTPUT);//D
  pinMode(11, OUTPUT);//E
  pinMode(12, OUTPUT);//F
  pinMode(16, OUTPUT);//G
  digitalWrite(3, LOW);
  digitalWrite(2, HIGH);//A
  digitalWrite(4, HIGH);//B
  digitalWrite(9, HIGH);//C
  digitalWrite(10, HIGH);//D
  digitalWrite(11, HIGH);//E
  digitalWrite(12, HIGH);//F
  digitalWrite(16, HIGH);//G
}

void loop() { 
  Disnum(0);
  muxall();
  delay(500);
  Disnum(1);
  muxall();
  delay(500);
  Disnum(2);
  muxall();
  delay(500);
  Disnum(3);
  muxall();
  delay(500);
  Disnum(4);
  muxall();
  delay(500);
  Disnum(5);
  muxall();
  delay(500);
  Disnum(6);
  muxall();
  delay(500);
  Disnum(7);
  muxall();
  delay(500);
  Disnum(8);
  muxall();
  delay(500);
  Disnum(9);
  muxall();
  delay(500);
}

void muxall(){
  mux(0);
  mux(1);
  mux(2);
  mux(3);
  mux(4);
  mux(5);
  mux(6);
  mux(7);
  mux(8);
  mux(9);
  mux(10);  
  mux(11);
}

void mux(uint8_t chanel){
  digitalWrite(5, chanel & 0x01);
  digitalWrite(6, chanel & 0x02);
  digitalWrite(7, chanel & 0x04);
  digitalWrite(8, chanel & 0x08);
}

void Disnum(uint8_t nut){
  
  if(nut == 0){D0();}
  else if(nut == 1){D1();}
  else if(nut == 2){D2();}
  else if(nut == 3){D3();}
  else if(nut == 4){D4();}
  else if(nut == 5){D5();}
  else if(nut == 6){D6();}
  else if(nut == 7){D7();}
  else if(nut == 8){D8();}
  else if(nut == 9){D9();}
}

void D0(){
  digitalWrite(2, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(11, HIGH);
  digitalWrite(12, HIGH);
}
void D1(){
  digitalWrite(4, HIGH);
  digitalWrite(9, HIGH);
}
void D2(){
  digitalWrite(2, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(11, HIGH);
  digitalWrite(16, HIGH);
}
void D3(){
  digitalWrite(2, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(16, HIGH);
}
void D4(){
  digitalWrite(4, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(12, HIGH);
  digitalWrite(16, HIGH);
}
void D5(){
  digitalWrite(2, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(12, HIGH);
  digitalWrite(16, HIGH);
}
void D6(){
  digitalWrite(2, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(11, HIGH);
  digitalWrite(12, HIGH);
  digitalWrite(16, HIGH);
}
void D7(){
  digitalWrite(2, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(9, HIGH);
}
void D8(){
  digitalWrite(2, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(11, HIGH);
  digitalWrite(12, HIGH);
  digitalWrite(16, HIGH);
}
void D9(){
  digitalWrite(2, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  digitalWrite(12, HIGH);
  digitalWrite(16, HIGH);
}